JP5512464B2 - Hollow fiber membrane module and filtration method - Google Patents

Description

  The present invention relates to a filtration module for performing turbidity and sterilization on relatively clear raw water such as river water and ground water, or to-be-treated water such as ultrapure water, and in particular, security in an ultrapure water line. The present invention relates to a hollow fiber membrane module suitable as a filter for use.

  In lines that produce ultrapure water used in the manufacture of electronic and electrical parts such as semiconductors and display elements, supply ultrapure water produced using microfiltration membranes, ion exchange resins, and reverse osmosis filtration membranes to use points Immediately before the filtration, it is filtered using a microfiltration membrane or an ultrafiltration membrane. This microfiltration membrane or ultrafiltration membrane functions as a security filter. As the filtration membrane module for this application, an external pressure filtration membrane module that supplies and filters raw water to the outside of the hollow fiber membrane is mainly used.

  On the other hand, in recent years, the amount of ultrapure water to be used has been increased along with the expansion of the production scale, and the ultrapure water production equipment has also been increasing in size, and there is an increasing demand for making the production equipment compact. Under such circumstances, a module having high filtration performance, that is, a module having a large filtration flow rate per module and a large filtration flow rate per unit volume is demanded.

  However, in the conventional external pressure filtration membrane module, when the amount of supplied water is increased and the throughput per unit time is increased, the water flows through the module at a high speed, whereby the hollow fiber membrane is formed. A phenomenon of intense vibration occurs. This is because the hollow fiber membranes and the hollow fiber membranes rub against the components in the module while the filtration is continued for a long time, so that the pores on the membrane surface are clogged and the water permeability is deteriorated or the hollow fiber membranes are damaged. As a result, the quality of the filtered water is reduced. As a method for preventing the damage of the hollow fiber membrane due to such a water flow, a method of providing a protective flow straightening tube between the housing and the hollow fiber membrane bundle has been proposed (see Patent Documents 1 to 3).

  Also, when a hollow fiber membrane bundle is formed by bundling a plurality of hollow fiber membranes, the hollow fiber membrane bundle is accommodated in a housing and both ends are fixed with an adhesive layer, the density distribution of the hollow fiber membranes is likely to be biased If a hollow fiber membrane module is formed with a large bias, the individual differences in processing capacity become large and quality control becomes difficult. In order to prevent such uneven distribution of the density of the hollow fiber membrane, for example, in Patent Document 4, the density of the hollow fiber membrane is determined by inserting a reinforcing rib (insert) into the end of the hollow fiber membrane bundle. A hollow fiber membrane module having a uniform distribution is disclosed.

JP-A-62-204804 Japanese Patent Publication No. 07-102307 JP 2000-37616 A WO 97/10893 pamphlet

  However, when a hollow rib membrane module is formed by inserting a reinforcing rib or the like at the end of the hollow fiber membrane bundle and mounting a rectifying cylinder as described above, continuous filtration is performed at a high flow rate. In some cases, the quality of the filtered water may deteriorate due to damage to the hollow fiber membrane.

  An object of the present invention is to provide a hollow fiber membrane module capable of extending the life of a hollow fiber membrane and generating water of stable and good quality continuously and a filtration method. With the goal.

  The inventors of the present invention have made extensive studies and verified in order to investigate the cause of the damage of the hollow fiber membrane. As a result, for example, when a conventional insert is inserted into the end of a hollow fiber membrane bundle and the end is surrounded by a conventional rectifying tube and bonded, the hollow fiber membrane exposed in the rectifying tube from the adhesive layer It was confirmed that damage was mainly caused at the base of Furthermore, in the conventional hollow fiber membrane module, since the distance from the insert contained in the adhesive layer to the root portion of the hollow fiber membrane is very short, it was affected by the insert at the root portion of the hollow fiber membrane. A gap was formed, and the present invention was conceived with the knowledge that the hollow fiber membrane facing the gap was damaged.

  That is, the present invention is a hollow fiber membrane bundle composed of a plurality of hollow fiber membranes having openings at both ends, a housing that accommodates the hollow fiber membrane bundle, and both ends of the hollow fiber membrane bundle are bonded and fixed to the housing, An adhesive fixing layer that partitions a first region where the opening of the hollow fiber membrane is exposed and a second region communicating with the first region across the hollow fiber membrane, and a fluid inlet / outlet provided in the housing, A hollow fiber membrane module comprising: a bias regulating member disposed in at least one end of the hollow fiber membrane bundle in order to reduce a deviation in density distribution of the plurality of hollow fiber membranes; A bias regulating member enclosing a part of the end side, the bias regulating member is included in the adhesive fixing layer, a part of the current regulating cylinder is fixed to the adhesive fixing layer, and the bias regulating member and the current regulating cylinder are included in the adhesive fixing layer. Is characterized by being spaced apart in the longitudinal direction of the hollow fiber membrane bundle. .

  In the present invention, since the bias regulating member is disposed at one end of the hollow fiber membrane bundle, at least one end can reduce the uneven density distribution of the hollow fiber membrane, and the end of the hollow fiber membrane bundle can be reduced. The hollow fiber membrane can be protected from strong vibration by surrounding a part of the portion side with a rectifying cylinder. Further, in the conventional hollow fiber membrane module, the distance between the root portion of the hollow fiber membrane protruding from the adhesive layer in the rectifying tube and the insert becomes extremely short, and the ends of the adjacent hollow fiber membranes sandwiching the insert This gap is not absorbed in the adhesive layer, and appears in the root portion of the hollow fiber membrane, resulting in a gap in which the density of the hollow fiber membrane is partially sparse. Then, the flow rate of the water to be treated flowing through the gap locally increases, the flow in the housing becomes non-uniform (uneven flow), an excessive load is applied to the hollow fiber membrane near the gap, and the filtration flow rate is increased as a result. Cause damage. On the other hand, according to the present invention, since the bias regulating member and the rectifying cylinder are separated in the longitudinal direction of the hollow fiber membrane bundle in the adhesive fixing layer, the distance between the root portion of the hollow fiber membrane and the bias regulating member is increased. It is easy to extend, and therefore a gap due to the arrangement of the bias regulating member is less likely to appear at the root portion of the hollow fiber membrane, and damage is less likely to occur even if the filtration flow rate is increased. As a result, the life of the hollow fiber membrane can be extended, and water with good water quality can be continuously supplied.

  Further, the adhesive fixing layer has an outer end surface that is flush with the end surface of the hollow fiber membrane bundle from which the opening of the hollow fiber membrane is exposed, and an inner end surface formed in the rectifying cylinder, and the bias regulating member is a hollow member. It extends along the longitudinal direction of the thread membrane bundle, and has an outer end portion that is flush with the outer end surface and an inner end portion that is disposed in the adhesive fixing layer. The length to the end is preferably smaller than the length from the inner end to the inner end face of the adhesive fixing layer. In the region within the adhesive fixing layer, the region closer to the inner end surface near the root portion of the hollow fiber membrane is thicker than the region closer to the outer end surface where the bias restricting member is disposed. Since it becomes easy to ensure a sufficient distance such that a gap due to the arrangement of the hollow fiber membrane does not occur at the root portion of the hollow fiber membrane, it becomes easy to effectively suppress breakage at the root portion of the hollow fiber membrane.

  Furthermore, it is preferable that the value obtained by dividing the height of the bias regulating member by the thickness of the adhesive fixing layer is 0.1 times or more and smaller than 0.5 times. If this value is 0.5 times or more, it is inferred that there is a possibility that the flow in the housing becomes non-uniform (diffusion) due to the influence of the bias regulating member. In particular, the function as a bias regulating member cannot be sufficiently exerted, and the hollow fiber membrane bundles are dispersed in the housing, and the hollow fiber membrane bundles are difficult to hold at a predetermined size during module assembly.

  Further, both adhesive fixing layers formed at both ends of the hollow fiber membrane bundle include a bias regulating member, respectively, and a part of the rectifying cylinder is fixed to each of the adhesive fixing layers. It is preferable that the member and the rectifying cylinder are separated from each other in the longitudinal direction of the hollow fiber membrane bundle. Both bias regulating members reduce the bias of the hollow fiber membranes at both ends of the hollow fiber membrane bundle, and the hollow fiber membranes can be protected from strong vibrations by both rectifying cylinders. Furthermore, in both the adhesive fixing layers, the bias regulating member and the rectifying cylinder are separated from each other in the longitudinal direction of the hollow fiber membrane bundle, so that the root portion of the hollow fiber membrane is damaged at both ends of the hollow fiber membrane bundle. It can be effectively suppressed.

  Further, the bias regulating member is preferably a flat plate extending along the longitudinal direction of the hollow fiber membrane bundle. Since it is flat, it becomes easy to partition a plurality of hollow fiber membranes by a surface, and it becomes easy to divide a plurality of hollow fiber membranes into an equal number, and the bias can be effectively reduced.

  Further, it is preferable to further include a net-shaped drift suppressing portion attached to the outer periphery of the hollow fiber membrane bundle. By mounting the drift suppression part on the outer periphery of the hollow fiber membrane bundle, the gap between the plurality of hollow fiber membranes is reduced, and the drift in the housing can be suppressed.

  Further, it is preferable that the drift suppressing part is wound around the outer periphery of the hollow fiber membrane bundle, and the number of turns is single. It is effective to suppress the enlargement of the size by setting the number of turns to a minimum.

  Furthermore, it is preferable that the flow straightening cylinder is formed with a plurality of flow path holes along the circumferential direction while avoiding the side facing the entrance / exit. When a flow path hole is formed on the side facing the entrance / exit, it is assumed that the liquid easily flows at high speed through the flow path hole, and damage to the hollow fiber membrane is assumed to be large. By avoiding the facing side with the inlet / outlet and forming a plurality of channel holes along the circumferential direction, the fluid entering / exiting from the inlet / outlet bypasses and easily enters / exits from each channel hole, and the fluid is locally high-speed. Can be prevented.

  Furthermore, it is preferable that the bias regulating member is disposed in the adhesive fixing layer so as to avoid the side facing the doorway. Compared with the case where the bias regulating member is provided on the side facing the doorway, it is possible to prevent the fluid from locally becoming high speed and damaging the hollow fiber membrane.

  Further, the present invention is a filtration method using each of the hollow fiber membrane modules described above, wherein water to be treated is introduced into at least one of the first region and the second region, and permeates the hollow fiber membrane. Then, the filtered water is discharged from the other region. ADVANTAGE OF THE INVENTION According to this invention, the lifetime of a hollow fiber membrane can be extended and the water of favorable favorable water quality can be produced | generated continuously.

  ADVANTAGE OF THE INVENTION According to this invention, the lifetime of a hollow fiber membrane can be extended and the water of favorable favorable water quality can be produced | generated continuously.

It is sectional drawing which shows the hollow fiber membrane module which concerns on embodiment of this invention. It is sectional drawing which expands and shows the upper end part of the hollow fiber membrane module which concerns on this embodiment. It is sectional drawing which expands and shows the lower end part of the hollow fiber membrane module which concerns on this embodiment. It is a figure which expands and shows the upper end surface of a hollow fiber membrane bundle. It is a figure which expands and shows the lower end surface of a hollow fiber membrane bundle. It is a disassembled perspective view of the module precursor assembled beforehand in order to manufacture a hollow fiber membrane module. It is a disassembled perspective view of a hollow fiber membrane module. It is a figure which shows a filtration apparatus typically. It is sectional drawing which shows typically the hollow fiber membrane module which concerns on this embodiment, and the hollow fiber membrane module which concerns on a comparative example, (a) is a longitudinal cross-sectional view which shows the lower part of the hollow fiber membrane module which concerns on this embodiment, (B) is a sectional view taken along line bb in (a), (c) is a longitudinal sectional view showing the lower part of a conventional hollow fiber membrane module, and (d) is taken along line dd in (c). FIG.

  Hereinafter, a hollow fiber membrane module according to a preferred embodiment of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment, The aspect which embodies this invention is included widely.

  A hollow fiber membrane module (see FIG. 1) 1 according to this embodiment is used in a filtration device (see FIG. 8) 100 for producing ultrapure water. For example, the hollow fiber membrane module 1 is used for external pressure filtration performed immediately before supplying ultrapure water produced using a microfiltration membrane, an ion exchange resin, or a reverse osmosis filtration membrane to a use point, and serves as a safety filter. It has a function. The hollow fiber membrane module 1 is a module that requires high filtration performance in order to make the equipment compact, that is, a high filtration flow rate per unit and a high filtration flow rate per unit volume.

  As shown in FIGS. 1 to 3, the hollow fiber membrane module 1 includes a hollow fiber membrane bundle 3 composed of a plurality of hollow fiber membranes 2 having openings P (see FIG. 4) at both ends, and a hollow fiber membrane bundle 3. And the both ends of the hollow fiber membrane bundle 3 are bonded and fixed to the housing 5, and the first region A1 where the opening P of the hollow fiber membrane 2 is exposed and the hollow fiber membrane 2 are sandwiched between the first region A1 and the hollow fiber membrane 2. Adhesive fixing layers 7A and 7B that divide the second region A2 communicating with the region A1 are provided.

  The housing 5 includes a cylindrical housing body 9, a pipe connection cap (hereinafter referred to as “header cap”) 10 attached to the upper end of the housing body 9, and a pipe connection cap (hereinafter referred to as “header cap”). , “Bottom cap”) 11.

  The housing body 9 is disposed between the header portion 15 to which the header cap 10 is attached, the bottom portion 17 to which the bottom cap 11 is attached, and the header portion 15 and the bottom portion 17. A body portion 13 to be bonded and integrated. The header portion 15 is provided with an upper nozzle (fluid inlet / outlet port) 19 for fluid entry / exit, and the bottom portion 17 is provided with a lower nozzle (fluid inlet / outlet port) 21 for fluid entry / exit. The lower nozzle 21 is provided so as to protrude in a direction orthogonal to the axis SL of the housing body 9.

  The header cap 10 is provided with a conduit (fluid inlet / outlet) 10 a for fluid entry and exit, and is fixed to the upper end of the housing 5 by tightening the cap nut 23. Similarly, the bottom cap 11 is provided with a fluid passage (fluid inlet / outlet) 11 a and is fixed to the lower end of the housing body 9 by tightening the cap nut 23.

  In order to reduce the deviation of the density distribution of the plurality of hollow fiber membranes 2, bias regulating members 25 </ b> A and 25 </ b> B are arranged in the lower end portion and the upper end portion of the hollow fiber membrane bundle 3 accommodated in the housing 5. Has been. As the bias regulating members 25A and 25B, for example, a plate shape or a rod shape (columnar shape) can be appropriately selected. In the present embodiment, the bias regulating members 25 </ b> A and 25 </ b> B are inserted at both ends of the hollow fiber membrane bundle 3, and the density distribution bias of the hollow fiber membrane 2 is reduced at both ends of the hollow fiber membrane bundle 3. The bias regulating members 25A and 25B can be inserted into only one end of the hollow fiber membrane bundle 3, and even in this mode, the bias regulating member inserted into one of the hollow fiber membrane bundles 3 is also possible. 25A and 25B reduce the uneven distribution of the density distribution of the hollow fiber membrane 2 at one end of the hollow fiber membrane bundle 3.

  In the present embodiment, as an example of a plate-shaped deviation regulating member, cross plates 25A and 25B having an X-shaped cross section formed by crossing two rectangular flat plates so as to be orthogonal to each other will be described as an example. The cross plates 25 </ b> A and 25 </ b> B are arranged so that the intersecting line portion 25 b of the two rectangular flat plates is along the longitudinal direction of the hollow fiber membrane bundle 3. The cross plates 25A and 25B are provided with four plate pieces 25a (see FIGS. 4 and 5) projecting radially from the intersecting line portion 25b, and the upper end or lower end of the hollow fiber membrane bundle 3 is The four plate pieces 25a are substantially equally divided into four, and the uneven density distribution of the hollow fiber membrane 2 is corrected.

  The cross plates 25A and 25B are disposed in the adhesive fixing layers 7A and 7B so as not to face the upper nozzle 19 or the lower nozzle 21. Specifically, the side edge 25c of each plate piece portion 25a is arranged so as to be shifted from the center line CL of the upper nozzle 19 or the lower nozzle 21.

  On both ends of the hollow fiber membrane bundle 3, rectifying cylinders 27 and 28 are mounted, respectively. The rectifying cylinders 27 and 28 are provided in order to maintain a space between the hollow fiber membrane bundle 3 and the inner surface of the housing body 9 in the vicinity of the upper nozzle 19 or the lower nozzle 21. The rectifying cylinders 27 and 28 are cylindrical bodies provided so as to surround the outer periphery of the hollow fiber membrane bundle 3, and a part thereof is embedded and fixed in the adhesive fixing layers 7A and 7B. In this embodiment, the both ends of the hollow fiber membrane bundle 3 are surrounded by the rectifying cylinders 27 and 28, so that both ends of the hollow fiber membrane 2 can be protected from strong vibrations that occur during filtration. In addition, the mode which arrange | positioned the rectification | straightening cylinders 27 and 28 only to either one of the hollow fiber membrane bundles 3 is also possible, and in the case of the aspect, the rectification | straightening cylinders 27 and 28 arrange | positioned in any one of the hollow fiber membranes. It can protect from a strong vibration in the edge part of one side of 2. FIG.

  The length of the rectifying cylinder 27 on the upper end side in the direction along the axis SL of the housing main body 9 (longitudinal direction of the hollow fiber membrane bundle 3) is the opening 19a inside the upper nozzle 19 from the inner end surface 74 of the adhesive fixing layer 7A. It is preferable to extend to a lower position exceeding the distance, and it is preferable to have a length enough to interfere with the fluid flow by facing the opening 19a. Similarly, the length of the rectifying cylinder 28 on the lower end side preferably extends from the inner end surface 72 of the adhesive fixing layer 7B to an upper position beyond the opening 21a on the inner side of the lower nozzle 21, and faces the opening 21a. It is preferable to have a length that interferes with the fluid flow. In the following description, the flow straightening cylinder on the upper nozzle 19 side will be described as a normal pan 27 and the skirt pan 28 on the lower nozzle 21 will be described.

  Usually, the eye plate 27 has a cylindrical shape, and a flange portion 27a is formed at one end thereof. The flange portion 27 a is brought into contact with and stopped by a step portion 15 a formed in the header portion 15 in order to set the normal eye plate 27 at a predetermined position in the housing body 9. Further, the normal eye plate 27 is formed with a plurality of flow passage holes 27b through which the fluid passes along the circumferential direction. The plurality of flow path holes 27 b are formed so as to avoid a partial region (closed region) 27 c in the circumferential direction of the normal eye plate 27.

  Specifically, in the cross-section of the normal eye plate 27, the flow passage hole 27b is not formed in the range (60 degrees to 120 degrees) of a constant angle θ with respect to the entire circumference (360 degrees), and the closed wall portion is formed. 27c is formed. The normal eye plate 27 is disposed such that the closing wall portion 27 c faces the opening 19 a inside the upper nozzle 19 and the vicinity of the center of the closing wall portion 27 c substantially coincides with the center line CL of the upper nozzle 19. As a result, the flow passage hole 27b of the normal dish 27 embodies an aspect in which a plurality of flow passage holes 27b are formed along the circumferential direction while avoiding the facing side with the upper nozzle 19. By disposing the closed wall portion 27 c at a position facing the upper nozzle 19, the water to be treated is discharged from the upper nozzle 19 while detouring, suppressing the occurrence of local high-speed flow, and the hollow fiber membrane 2. It is possible to extend the life by effectively suppressing the damage to.

  As shown in FIG. 3, the skirt plate 28 has a cylindrical shape, and a lower end portion is embedded and fixed in the adhesive fixing layer 7B.

  As shown in FIGS. 1 and 6, a net-shaped drift suppressing portion 29 is wound around and attached to the outer periphery of the central portion in the longitudinal direction of the hollow fiber membrane bundle 3. The number of turns of the drift current suppressing portion 29 is single, and it is considered that excessive flow velocity resistance does not occur while suppressing the liquid drift. Moreover, it is effective in suppressing the enlargement of size by making it single winding.

  As shown in FIGS. 1 to 3, adhesive fixing layers 7 </ b> A and 7 </ b> B are formed in the upper and lower positions in the housing 5, respectively. The upper adhesive fixing layer 7A includes the hollow fiber membranes 2 at the upper end portion of the hollow fiber membrane bundle 3 and the cross plate 25A so as to be fixed and integrated. It is fixed to the inner surface of the housing body 9. The lower adhesive fixing layer 7B includes the hollow fiber membranes 2 at the lower end of the hollow fiber membrane bundle 3 and the cross plate 25B so as to be fixed and integrated, and the lower portion of the skirt plate 28 is embedded and integrated to form a bottom portion. 17 is fixed to the inner surface.

  The inside of the housing 5 is divided into three spaces by the upper adhesive fixing layer 7A and the lower adhesive fixing layer 7B. Of these three spaces, the space formed in the header cap 10 and the space formed in the bottom cap 11 are the first region A1 where the opening P at the end of the hollow fiber membrane 2 is exposed, and A space in the housing body 9 formed between the side adhesive fixing layer 7B and the upper adhesive fixing layer 7A is a second area A2 that communicates with the first area A1 with the hollow fiber membrane 2 interposed therebetween. .

  In the hollow fiber membrane module 1 according to the present embodiment, external pressure filtration is assumed. For example, the lower nozzle 21 is used as an inlet for water to be treated and is placed in the second region A2 via the lower nozzle 21. Accept treated water. The upper nozzle 19 is used as a discharge port for circulating the treated water or concentrating the treated water, and discharges the treated water passing through the second region A2 from the housing body 9. On the other hand, the filtered water that has permeated through the hollow fiber membrane 2 passes through the first region A1 and is discharged from the pipe lines 10a and 11a of the header cap 10 and the bottom cap 11.

  Next, the manufacturing method of the hollow fiber membrane module which concerns on this embodiment is demonstrated with reference to FIG. 6, FIG. FIG. 6 is an exploded perspective view of a module precursor that is pre-assembled to manufacture a hollow fiber membrane module, and FIG. 7 is an exploded perspective view of the hollow fiber membrane module.

  The module precursor 50 includes an adhesive fixing layer forming container 51 for forming the housing body 9. The adhesive fixing layer forming container 51 includes a cylindrical main body container 51a, an upper container (hereinafter referred to as a “header container”) 51b that is liquid-tightly fixed to the upper part of the main body container 51a, and a liquid-tight member at the lower part of the main body container 51a A lower container (hereinafter referred to as “bottom container”) 51c. The upper nozzle 19 is provided in the header container 51b, and the lower nozzle 21 is provided in the bottom container 51c. The header container 51b is normally liquid-tightly bonded and fixed to the upper end of the main body container 51a in a state in which the eye plate 27 is accommodated, and the bottom container 51c is liquid-tight in the lower end of the main body container 51a in a state in which the skirt eye plate 28 is accommodated. Bonded and fixed.

  The hollow fiber membrane bundle 3 is formed by bundling a plurality of hollow fiber membranes 2. Centering inserts 53 are inserted into both ends of the hollow fiber membrane bundle 3. The insert 53 has an X-shaped cross section and also has a function of correcting the uneven density distribution of the plurality of hollow fiber membranes 2. The insert 53 inserted vertically is cut at a predetermined position. As a result, when the hollow fiber membrane element 4 is manufactured, the cross plates 25A and 25B are formed.

  A net-shaped drift suppressing portion 29 is wound around the outer periphery of the hollow fiber membrane bundle 3. The hollow fiber membrane bundle 3 is inserted into the adhesive fixed layer forming container 51 in a state where the insert 53 is inserted into both ends and the drift suppressing part 29 is wound. P caps 55 are respectively attached to both ends of the adhesive fixing layer forming container 51, and both ends of the hollow fiber membrane bundle 3 are set in contact with the P caps 55.

  A hole (adhesive injection port) 55a for injecting an adhesive is formed in the P cap 55, and a predetermined adhesive is injected from the adhesive injection port 55a to form an adhesive layer. The adhesive layers become adhesive fixing layers 7A and 7B when the hollow fiber membrane element 4 is manufactured by cutting at a predetermined position.

  The injection / curing of the adhesive may be performed by a so-called centrifugal bonding method using centrifugal force, or may be performed by a so-called stationary bonding method in which the adhesive is forcibly injected and cured under standing. . The centrifugal bonding method is preferred because the coating layer on the outer surface of the hollow fiber membrane 2 on the inner surface when the adhesive fixing layers 7A and 7B are formed can be made uniform and the membrane is not easily broken. In the case of the centrifugal bonding method, it is a standard method to rotate the nozzle horizontally with the nozzle facing upward. In the case of the centrifugal bonding method, the rotation is stopped at the stage where the curing reaction has progressed to such an extent that the adhesive does not flow, and then the reaction is completed by heating in an oven or the like to a practical curing state. Is preferred.

  The interface of the adhesive layer formed on the header container 51 b side is formed in the vicinity of the upper nozzle 19 and at a position where it does not enter the opening 19 a inside the upper nozzle 19. Further, the interface of the adhesive layer formed on the bottom container 51 c side is formed in the vicinity of the lower nozzle 21 at a position where it does not enter the opening 21 a inside the lower nozzle 21. The interface of the adhesive layer formed on the header container 51b side becomes the lower end surface 74 of the adhesive fixing layer 7A when the hollow fiber membrane element 4 is manufactured. Further, the interface of the adhesive layer formed on the bottom container 51c side becomes the upper end surface 72 of the adhesive fixing layer 7B when the hollow fiber membrane element 4 is manufactured.

  In this embodiment, the header container 51b and the P cap 55 are configured as separate bodies, and the bottom container 51c and the P cap 55 are configured as separate bodies. However, the bottom container and the P cap portion ( End container portion), or a container shape in which a header container and a P cap portion (end container) are integrally formed may be formed. In addition, the adhesive may be injected from the injection port provided in the end container part, or directly from the opening end near the center of the hollow fiber membrane bundle of the bottom part or the header part. You can also Moreover, it is also possible to inject directly from the nozzle provided in the bottom container or the header container.

  Due to the curing of the adhesive, the end of the hollow fiber membrane bundle 3, the insert 53, and the rectifying cylinders 27 and 28 are integrated and further fixed to the inner surface of the adhesive fixing layer forming container 51 via the adhesive layer. A precursor 50 is formed. Thereafter, both ends of the module precursor 50 are partially cut at predetermined positions to form openings P at the ends of the hollow fiber membrane 2 to complete the hollow fiber membrane element 4.

  In the present embodiment, an embodiment is described in which the adhesive layer is fixed to the adhesive fixing layer forming container 51 and becomes the housing body 9 as it is. For example, in the case of a hollow fiber membrane element for a cartridge type module, The adhesive fixing layer forming container 51 is made of a material having a weak adhesive force with the cured adhesive and has a peelable structure so that the adhesive fixing layer forming container 51 is peeled after the adhesive is cured. It can also be configured to be removed.

  As shown in FIG. 7, male threads to which the cap nut 23 is screwed are formed at both ends of the hollow fiber membrane element 4. At both ends of the hollow fiber membrane element 4, a bottom cap 11 or a header cap 10 for connecting to a pipe is mounted via a seal member 12 such as an O-ring, and is fastened and fixed by a cap nut 23 to be hollow. The yarn membrane module 1 is completed. In addition, the hollow fiber membrane module 1 which concerns on this embodiment is used for the external pressure filtration which capture | acquires microparticles | fine-particles in an outer surface skin layer, and, as for the filtration system, both dead-end filtration (total amount filtration) and crossflow filtration are used. Can be used.

  Next, an example of an aspect in which the hollow fiber membrane module 1 according to the present embodiment is installed in the filtration device 100 for ultrapure production will be described with reference to FIG. 8, and the hollow fiber membrane module 1 according to the present embodiment will be described. The filtration method using the will be described. In addition, in the filtration apparatus 100 for ultra-pure production, a cross flow filtration method using external pressure filtration is assumed.

  As shown in FIG. 8, the filtration device 100 is used, for example, as a filter for securing ultrapure water, and supplies water to be treated from the lower nozzle 21 to the second region A2 outside the hollow fiber membrane 2. Then, it is filtered to the inside (hollow part) side of the hollow fiber membrane 2, and filtered water (ultra pure water) is discharged from the second region A <b> 1 that is the both end side of the hollow fiber membrane bundle 3. Circulating water (concentrated water) is discharged from the second region A2 through the upper nozzle 19.

  The filtration device 100 includes a supply pipe 101 that is connected to the lower nozzle 21 of the hollow fiber membrane module 1 and supplies water to be treated, and a circulation pipe 102 that is connected to the upper nozzle 19 and sends out circulating water. Further, a pressure gauge, various valves 101a and 102a, and the like are disposed in the middle of the supply pipe 101 and the circulation pipe 102. Moreover, the filtration apparatus 100 is provided with the upper filtrate drainage pipe 103 and the lower filtrate drainage pipe 104 used as the flow path of filtrate. The upper filtrate drain pipe 103 and the lower filtrate drain pipe 104 are connected to a filtrate combined pipe 105, and the junction pipe 105 communicates with an external pipe (not shown). The junction pipe 105 is provided with a pressure gauge, various valves 105a, and the like.

  The hollow fiber membrane module 1 is generally arranged vertically so that the upper nozzle 19 side in which the eye plate 27 is accommodated is upward, the upper nozzle 19 is connected to the circulation pipe 102, and the pipe line 10a of the header cap 10 is the upper part. Connected to the filtered water discharge pipe 103. The lower nozzle 21 is connected to the supply pipe 101, and the conduit 11 a of the bottom cap 11 is connected to the lower filtrate discharge pipe 104.

  Water to be treated such as ultrapure is introduced into the second region (primary side region) A2 of the hollow fiber membrane module 1 from the supply pipe 101 through the lower nozzle 21 at a predetermined pressure. In the housing body 9, a part of the introduced water to be treated is filtered by the hollow fiber membrane 2 to reach the hollow portion, and moves upward or downward as filtered water. The filtered water that has moved upward or downward passes through the opening P at the end of the hollow fiber membrane 2 into the first region (secondary region) A1 in the header cap 10 or the bottom cap 11, and each pipe line 10a, 11a, the upper filtrate discharge pipe 103 or the lower filtrate discharge pipe 104 is discharged to the junction pipe 105 and collected through the external pipe. On the other hand, the water to be treated that does not pass through the hollow fiber membrane 2 and rises in the second region A <b> 2 in the housing body 9 is discharged from the upper nozzle 19 as circulating water and sent out to the circulation pipe 102.

  By the above filtration method, filtered water with good water quality can be stably obtained for a long time without causing damage to the hollow fiber membrane 2. Further, it is preferable to perform the filtration operation while allowing about 2 to 5% of the supplied water amount to flow out as circulating water from the upper nozzle 19. In this way, the fine particles or the like excluded by the hollow fiber membrane 2 are discharged out of the hollow fiber membrane module 1, so that the membrane surface is less likely to be clogged and a stable amount of filtered water can be obtained over a longer period of time.

  In addition, the lower filtrate discharge pipe 104 connected to the bottom cap 11 rises with an elbow and joins the upper filtrate discharge pipe 103 connected to the header cap 10. Since both the upper and lower rectifying cylinders (the skirt plate 28 and the normal plate 27) are not of the same structure, the flow resistance in the hollow fiber membrane module 1 of filtrate and the flow resistance in the filtrate discharge pipes 103 and 104 As a result, the amount of filtrate from the upper filtrate discharge pipe 103 and the amount of filtrate from the lower filtrate discharge pipe 104 become substantially the same. Accordingly, there is no need to provide flow rate adjusting valves in the filtrate discharge pipes 103 and 104 in order to balance the filtrate amounts flowing out of the header cap 10 and the bottom cap 11, and as a result, there is an advantage that the number of valves can be reduced. . In addition, in the final filter application of ultrapure water, a method may be used in which treated water is supplied from the lower side and filtered water is led out to the upper side so that air does not accumulate in the piping.

  Next, the configuration of the lower end and the upper end of the hollow fiber membrane module 1 according to this embodiment will be described in more detail, and the effects of the hollow fiber membrane module 1 will be described.

  As shown in FIG. 2, the upper adhesive fixing layer 7A has an upper end surface (outer end surface) 73 that is flush with the end surface of the hollow fiber membrane bundle 3 where the opening P communicating with the inside of the hollow fiber membrane 2 is exposed. And a lower end surface (inner end surface) 74 that is normally formed in the eye plate 27. Usually, the upper part of the eye plate 27 is fixed to the adhesive fixing layer 7A, and the cross plate 25A is included in the adhesive fixing layer 7A. In the adhesive fixing layer 7A, the cross plate 25A and the normal eye plate 27 are separated in the longitudinal direction of the hollow fiber membrane bundle 3. For example, in the case of the general hollow fiber membrane module 1 in which the thickness of the adhesive fixing layer 7A is about 55 mm, the separation dimension d1 may be 1 mm to 50 mm, and particularly preferably 20 mm to 45 mm.

  Furthermore, the cross plate 25A extends along the longitudinal direction of the hollow fiber membrane bundle 3 in a state of being included in the upper adhesive fixing layer 7A, and is an upper end that is flush with the upper end surface 73 of the adhesive fixing layer 7A. Part (outer end part) 25s and a lower end part (inner end part) arranged in the adhesive fixing layer 7A. The length L1 from the upper end 25s to the lower end 25t of the cross plate 25A is smaller than the length L2 from the lower end 25t of the cross plate 25A to the lower end surface 74 of the adhesive fixing layer 7A.

  As shown in FIG. 3, the lower adhesive fixing layer 7 </ b> B includes a lower end surface (outer end surface) 71 that is flush with the end surface of the hollow fiber membrane bundle 3, and an upper end surface ( Inner end face) 72. The lower part of the skirt plate 28 is fixed to the adhesive fixing layer 7B, and the cross plate 25B is included in the adhesive fixing layer 7B. The cross plate 25B and the skirt plate 28 are separated in the longitudinal direction of the hollow fiber membrane bundle 3 in the adhesive fixing layer 7B. For example, in the case of a general hollow fiber membrane module 1 in which the thickness of the adhesive fixing layer 7B is about 55 mm, the separation dimension d2 may be 1 mm to 50 mm, and particularly preferably 20 mm to 45 mm.

  Further, the cross plate 25B extends along the longitudinal direction of the hollow fiber membrane bundle 3 while being included in the lower adhesive fixing layer 7B, and is flush with the lower end surface 71 of the adhesive fixing layer 7B. It has a lower end portion (outer end portion) 25k and an upper end portion (inner end portion) 25m arranged in the adhesive fixing layer 7B. The length L3 from the lower end 25k to the upper end 25m of the cross plate 25B is smaller than the length L4 from the upper end of the cross plate 25B to the upper end surface 72 of the adhesive fixing layer 7B.

  Furthermore, in this embodiment, the value obtained by dividing the height of the cross plates 25A and 25B (the length in the longitudinal direction of the hollow fiber membrane bundle 3) by the thickness of the adhesive fixing layers 7A and 7B, that is, the height of the bias regulating member / It is preferable that the thicknesses of the adhesive fixing layers 7A and 7B are 0.1 times or more and less than 0.5 times.

  Next, referring to FIG. 9, the effects obtained by configuring the dimensions and arrangement of the cross plates 25A and 25B with respect to the adhesive fixing layers 7A and 7B, the normal eye plate 27, and the skirt eye plate 28 as described above will be described. explain. FIG. 9 shows a hollow fiber membrane module 1 according to the present embodiment and a hollow fiber membrane module 200 according to a comparative example assuming a conventional type, and (a) shows a lower adhesive fixing layer 7B. It is a longitudinal section showing typically, and (b) is a typical sectional view which met a bb line of (a). Moreover, (c) is a longitudinal cross-sectional view which shows typically the lower adhesive layer of the hollow fiber membrane module 200 which concerns on a comparative example, (d) is typical which followed the dd line | wire of (c). It is sectional drawing.

  The inventors of the present invention installed a hollow fiber membrane module (hereinafter referred to as “comparative example”) 200 according to a comparative example in a filtration device for producing ultrapure water, and carried out a predetermined water treatment by external pressure filtration. It has been found that the hollow fiber membrane 201 breaks in a short period of time. Therefore, the present inventors have verified the breakage point B, and in a mode in which the insert 202 (bias regulating member 25A, 25B) is inserted into the hollow fiber membrane bundle, the breakage point B of the hollow fiber membrane 201 is obtained. It has been found that they are not generated irregularly, but are generated at the root portion of the hollow fiber membrane 201 protruding from the adhesive fixing layer 7B in the rectifying cylinder 203 (see FIG. 9C). Furthermore, it was found that the break B was just above (or just below) where the rod-like or plate-like insert 202 is arranged (see FIG. 9D).

  And when the comparative example 200 was verified in order to investigate this cause, in the comparative example 200, since the dimension of the insert 202 is long, the upper end has reached the vicinity of the rectification | straightening cylinder 203, As a result, hollow fiber It has been found that the distance between the root of the membrane 201 and the insert 202 is very short. Further, due to the short distance, in Comparative Example 200, the gap between adjacent hollow fiber membranes 201 with the insert 202 interposed therebetween is not absorbed in the adhesive fixing layer 205, and the root portion of the hollow fiber membrane 201 is not absorbed. It has been found that there is a gap SL in which the density of the hollow fiber membrane 201 appears sparsely. Then, the present inventors locally increase the flow rate of the water to be treated that enters the flow straightening tube 203 during external pressure filtration and flows through the gap SL, and as a result, the flow in the housing is uneven. It was inferred that the vibration of the hollow fiber membrane 201 in the vicinity of the gap SL would increase and an overload would be applied, and damage would easily occur when the filtration flow rate was increased.

  Here, it is substantially difficult to increase the thickness of the adhesive layer 205 in order to increase the distance between the root portion of the hollow fiber membrane 201 and the insert 202 because the permeation performance of the hollow fiber membrane 201 is affected. . In addition, the insert 202 usually has an effect of reducing the amount of the adhesive, in addition to the effect of reducing the unevenness of the plurality of hollow fiber membranes 201. The idea of shortening the dimensions of 202 is not born.

  However, the present inventors made the idea of reverse rotation due to the idea of the above problem, and as shown in FIGS. 9A and 9B, the cross plates (bias regulating members) 25A and 25B When the dimensions are shortened and the dimensions and arrangement of the bias regulating members 25A and 25B with respect to the adhesive fixing layers 7A and 7B and the rectifying cylinders 27 and 28 are devised, the base portion of the hollow fiber membrane 2 is not degraded without reducing the filtration capacity. Breakage could be eliminated, and the life of the hollow fiber membrane 2 could be dramatically improved.

  That is, in the hollow fiber membrane module 1 according to the present embodiment, the bias regulating member 25B and the skirt plate (rectifier plate) 28 are separated in the longitudinal direction of the hollow fiber membrane bundle 3 in the lower adhesive fixing layer 7B. Or the bias regulating member 25A and the normal eye plate (rectifying plate) 27 are separated in the longitudinal direction of the hollow fiber membrane bundle 3 in the upper side adhesive fixing layer 7A. It becomes easy to increase the distance between the bias regulating members 25A and 25B. Therefore, the gap due to the arrangement of the bias regulating members 25A and 25B is difficult to appear in the root portion of the hollow fiber membrane 2, and breakage occurs even if the filtration flow rate is increased. It becomes difficult. As a result, it is possible to extend the life of the hollow fiber membrane 2 and continuously supply water with good and stable water quality.

  Furthermore, in the present embodiment, in the regions within the adhesive fixing layers 7A and 7B, the thicknesses of the regions near the outer end surfaces 71 and 73 where the bias regulating members 25A and 25B are arranged are close to the root portion of the hollow fiber membrane 2. It becomes smaller than the thickness of the region near the end faces 72 and 74, and as a result, it becomes easy to ensure a sufficient distance such that a gap due to the arrangement of the bias regulating members 25A and 25B does not occur in the root portion of the hollow fiber membrane 2. Therefore, it becomes easy to effectively suppress breakage at the root portion of the hollow fiber membrane 2.

  In the present embodiment, the value obtained by dividing the height of the bias regulating members 25A and 25B by the thickness of the adhesive fixing layers 7A and 7B, that is, the bias regulating member height / adhesive fixing layer thickness is 0.1 times or more, And it is a range smaller than 0.5 times. Here, when the deviation regulating member height / adhesive fixing layer thickness is 0.5 times or more, there is a possibility that the flow in the housing 5 becomes uneven (biased) due to the influence of the deviation regulating members 25A and 25B. On the other hand, if it is less than 0.1 times, the function as the bias restricting members 25A and 25B cannot be sufficiently exhibited, and the hollow fiber membrane bundle 3 varies in the housing 5, or the module assembly Sometimes it becomes difficult to hold the hollow fiber membrane bundle 3 at a predetermined size.

  Further, in this embodiment, in both the lower and upper adhesive fixing layers 7A and 7B, the bias regulating members 25A and 25B are included, respectively, and part of the rectifying cylinders 27 and 28 are fixed, respectively. In the adhesive fixing layers 7A and 7B, the bias regulating members 25A and 25B and the rectifying tubes 27 and 28 are separated from each other in the longitudinal direction of the hollow fiber membrane bundle 3, respectively. Therefore, the bias of the hollow fiber membrane 2 at both ends of the hollow fiber membrane bundle 3 is reduced by both bias regulating members 25A and 25B, and the hollow fiber membrane 2 is protected from strong vibrations by both the rectifying cylinders 27 and 28. it can. Further, in both the adhesive fixing layers 7A and 7B, the bias regulating members 25A and 25B and the rectifying cylinders 27 and 28 are separated from each other in the longitudinal direction of the hollow fiber membrane bundle 3, so that both ends of the hollow fiber membrane bundle 3 are It is possible to effectively suppress breakage of the root portion of the hollow fiber membrane 2 at the portion.

  Furthermore, since the bias regulating members 25A and 25B according to the present embodiment are flat cross plates 25A and 25B extending along the longitudinal direction of the hollow fiber membrane bundle 3, the hollow fiber membrane 2 can be easily partitioned on the surface, and a plurality of It becomes easy to divide the hollow fiber membranes 2 into equal numbers, and the bias can be effectively reduced.

  Furthermore, since the hollow fiber membrane module 1 according to the present embodiment includes the net-shaped drift suppressing portion 29 attached to the outer periphery of the hollow fiber membrane bundle 3, the gap between the plurality of hollow fiber membranes 2 is small. Therefore, the drift in the housing 5 can be suppressed. In particular, the drift suppression part 29 is wound around and mounted on the outer periphery of the hollow fiber membrane bundle 3 and the number of turns is a minimum single, which is effective in suppressing the increase in size.

  Further, the normal eye plate 27 according to the present embodiment is formed with a plurality of flow path holes 27b along the circumferential direction, avoiding the side facing the upper nozzle (entrance / exit) 19. For example, it is assumed that when the flow path hole 27b is formed on the side facing the upper nozzle (entrance / exit) 19, the liquid easily flows at high speed through the flow path hole 27b, and damage to the hollow fiber membrane 2 is increased. Is done. However, in the present embodiment, the water to be treated is bypassed from the inside of the normal dish 27 by avoiding the side facing the upper nozzle 19 (entrance / exit) 19 and forming a plurality of flow passage holes 27b along the circumferential direction. And since it comes to be discharged | emitted from the upper nozzle 19 through each flow-path hole 27b, it can prevent that to-be-processed water becomes locally high-speed.

  Furthermore, the bias regulating members 25A and 25B according to the present embodiment are disposed in the adhesive fixing layers 7A and 7B so as to avoid the side facing the lower nozzle (entrance / exit) 21 or the upper nozzle (entrance / exit) 19. According to this aspect, it is possible to prevent the water to be treated from flowing locally at a high speed and damaging the hollow fiber membrane 2.

  Next, each element which comprises the hollow fiber membrane module which concerns on this embodiment, and its modification are demonstrated in detail.

(Hollow fiber membrane)
As the hollow fiber membrane, a reverse osmosis membrane, a nanofiltration membrane, an ultrafiltration membrane, and a microfiltration membrane can be used. The material of the hollow fiber membrane is not particularly limited. Polysulfone, polyethersulfone, polyacrylonitrile, polyimide, polyetherimide, polyamide, polyetherketone, polyetheretherketone, polyethylene, polypropylene, poly (4-methylpentene), ethylene -Vinyl alcohol copolymer, cellulose, cellulose acetate, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene and the like, and these composite materials can also be used.

The hollow fiber membrane preferably has an inner diameter of 50 μm to 3000 μm, more preferably 500 to 2000 μm, and a ratio of the inner diameter to the outer diameter (inner / outer diameter ratio) of 0.3 to 0.8. Preferably used.
In particular, a higher filtration capacity is better, and in order to increase the filtration rate, it is preferable to use a hollow fiber membrane having a filtration capacity of 0.8 ml / min / cm ² at 0.1 MPa and 25 ° C. or higher. A material having a high bursting strength and compressive strength and having a pressure resistance of 0.5 MPa or more is preferable.

(Bias control member)
In the above embodiment, the bias regulating member composed of the cross plates 25A and 25B is exemplified. However, as the bias regulating member, for example, the cross-sectional shape is, for example, a circle, an ellipse, a polygon such as a quadrangle, a hexagon, or the like. A star shape or a plate shape can be adopted, and in the case of a circle or an ellipse, it is advantageous in that it is difficult to damage the hollow fiber membrane when contacting the hollow fiber membrane.

  In addition, when the thickness of the bias regulating member is a circle, an ellipse, or a polygon, it is easy to control the density distribution of the hollow fiber membrane to be 5 to 20 times the outer diameter of the hollow fiber membrane. It is preferable from the point. Here, the “thickness” means the equivalent circle diameter of the portion having the largest cross-sectional area in the length direction of the bias regulating member. Here, since the outer diameter of the hollow fiber membrane is generally 0.6 mm to 2.5 mm, specifically, it is selected from a range of 3 mm to 50 mm, preferably a range of 3 mm to 30 mm, and 5 mm to 20 mm. A range is particularly preferably used.

  Further, when the bias regulating member is plate-like, the average thickness thereof is not less than 3 times and not more than 15 times the outer diameter of the hollow fiber membrane for the same reason as described above that it is easy to control the density distribution of the hollow fiber membrane. Is preferred. In addition, it is preferable to make the tip of the bias regulating member into a shape that can be easily inserted into the hollow fiber membrane bundle 3 by making it conical or the like.

  The material of the bias regulating member is not particularly limited as a polymer material, an inorganic material, a metal material, etc. can be widely used. However, it is compatible with the adhesive constituting the adhesive fixing layer, and a sufficient adhesive effect is expected. It is preferably used that has a tensile modulus equal to or higher than that of the adhesive.

(Diffusion suppression part)
The material for the net-like drift suppressing part that covers the hollow fiber membrane bundle is not particularly limited, and polysulfone, polyethersulfone, polyacrylonitrile, polyimide, polyetherimide, polyamide, polyetherketone, polyetheretherketone, polyethylene , Polypropylene, poly (4-methylpentene), ethylene-vinyl alcohol copolymer, cellulose, cellulose acetate, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether A copolymer etc. are mentioned and these composite materials can also be used.

  In consideration of mounting to the hollow fiber membrane bundle, the drift suppressing part is composed of polyamide, polyethylene, polypropylene, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether. A copolymer or the like is preferred.

(Adhesive fixing layer)
The adhesive fixing layer is formed by injecting and curing a predetermined adhesive. The adhesive is preferably a polymer material such as an epoxy resin, a urethane resin, an epoxy acrylate resin, or a silicon resin. Especially, since it uses for an ultrapure water use, an epoxy resin is especially preferable from the quality of filtered water (The foreign material derived from the effluent of an adhesive agent, or a total organic substance component (generally called TOC component)).

  Further, the adhesive fixing layers 7A and 7B formed by these adhesives are required to have pressure resistance that can withstand the differential pressure generated during use, and for that purpose, have appropriate hardness. Is desirable. On the other hand, it is desirable to use an adhesive having an appropriate softness in order to reliably prevent the hollow fiber membrane from being broken by a fluid flow during physical washing or the like for a longer period of time.

  In the following Examples and Comparative Examples, polysulfone ultrafiltration membranes and module cases were used as hollow fiber membranes. The characteristics are shown below.

[About polysulfone ultrafiltration membranes]
Inner diameter / outer diameter: 0.6 mm / 1.0 mm,
External surface area equivalent short thread water permeability: 500 LMH (measured value at an effective membrane length of 5 cm),
Breaking strength: 5.5 MPa,
Elongation at break: 80%.
The amount of water permeated through the hollow fiber membrane is the amount of filtered water (LMH) when ultrafiltrated water at 25 ° C. is permeated from the inner surface to the outer surface of the hollow fiber membrane having a length of 50 mm. In calculating the water permeability, the effective membrane area was converted on the outer surface. The breaking strength and breaking elongation of the hollow fiber membrane were measured using an autograph AGS-5D manufactured by Shimadzu Corporation at a sample length of 30 mm and a pulling speed of 50 mm / min.
The breaking strength (MPa) is a value calculated by dividing the breaking load per hollow fiber membrane by the cross-sectional area of the membrane before pulling. The elongation at break (%) is the ratio of the length stretched to break to the original length.

[Case size used for hollow fiber membrane module production]
A cylindrical case made of transparent polysulfone having the following specifications was used.
Cylindrical inner diameter / outer diameter in the filtration region: 154 mm / 170 mm,
Inner diameter / outer diameter of cylindrical part in nozzle part: 162 mm / 183 mm,
Nozzle inner diameter: 58 mm,
Length of cylindrical case / distance between nozzle centers: 1050 mm / 872 mm.

[Filtration evaluation method and leak check method]
Operation was performed by external pressure filtration using the filtration device shown in FIG. Prior to the evaluation, a leak test was performed as follows.
That is, after removing the pipe connection caps at both ends, the module was immersed in a water tank to fill the interior with pure water. Next, the nozzle on one side was sealed with a stopper, and an air pipe was connected to the other nozzle. Air pressure was gradually applied to 0.1 MPa, and both ends of the module were observed to confirm whether or not air bubbles continued to emerge from the hollow portion.

[Example 1]
Hollow with 11600 polysulfone hollow fiber membranes made of PE net (Takiron, trade name Tricarnet), all in one bundle, housed in a transparent polysulfone housing, and both ends fixed with epoxy resin Filtration operation was performed using a thread membrane module.

At the end of the hollow fiber membrane bundle, a bias regulating member having the same composition as the epoxy resin for forming the adhesive fixing layer was used as a cross shape (cross plate) having a height of 63 mm, a width of 138 mm, and a thickness of 5 mm. Moreover, the cross board was arrange | positioned in the adhesion fixing layer avoiding the facing side with a lower nozzle or an upper nozzle.
The separation distance between the cross plate and the flow straightening cylinder was 22 mm, the height of the cross plate in the adhesive layer was 23 mm, and the distance from the inner end surface of the adhesive fixing layer to the cross plate was 28 mm.

  A hollow fiber membrane module was attached to a predetermined pipe of the filtration device, and ultrapure water was filtered as untreated water. The ultrapure water was produced by treating river water with a microfiltration membrane, a reverse osmosis membrane and an ion exchange resin, and a UV sterilization treatment.

At this time, the supply flow rate of the water to be treated to the hollow fiber membrane module was adjusted to the flow rate of 25 m ³ / h by adjusting the opening degree of the pump outlet valve.

  When the filtration operation was performed for 1 month, the operation was stopped, and air was used to check for leaks at external pressure (0.1 MPa / 2 minutes hold), but no air leakage from the module cut end face was observed. It was.

When the module was disassembled and the hollow fiber membrane was taken out and the outer surface was observed with an SEM, no abnormalities such as scratches were observed. The measured single yarn water permeability is 480L ^/ h ^/ m 2 ^/ 100kPa was little change.
In addition, the hollow fiber membrane bundle in the vicinity of the interface part (inner end face) of the adhesive fixing layer was scraped off and the interface was observed, but the hollow fiber bundle did not leave a trace of the cloth plate (not affected). confirmed.

  In addition, when the adhesive fixing layer was divided in half and the deviation regulating member height / adhesive fixing layer thickness was measured, it was 23/55 = 0.42 times.

[Example 2]
A hollow fiber membrane module using 11600 polysulfone hollow fiber membranes similar to those in Example 1, all bundled with PE net, housed in a transparent polysulfone housing, and fixed at both ends with epoxy resin A filtration operation was performed.
At the end of the hollow fiber membrane bundle, a bias regulating member having the same composition as the epoxy resin for forming the adhesive fixing layer was used as a cross shape having a height of 48 mm, a width of 138 mm, and a thickness of 5 mm. Moreover, the cross board was arrange | positioned in the adhesion fixing layer avoiding the facing side with a lower nozzle or an upper nozzle.
The separation distance between the cross plate and the flow straightening cylinder was 47 mm, the height of the cross plate in the adhesive layer was 8 mm, and the distance from the inner end surface of the adhesive fixing layer to the cross plate was 52 mm.

  A hollow fiber membrane module was attached to a predetermined pipe of the filtration device, and ultrapure water was filtered as untreated water. The ultrapure water was produced by treating river water with a microfiltration membrane, a reverse osmosis membrane and an ion exchange resin, and a UV sterilization treatment.

At this time, the supply flow rate of the water to be treated to the hollow fiber membrane module was adjusted to the flow rate of 25 m ³ / h by adjusting the opening degree of the pump outlet valve.

  When the filtration operation was performed for 1 month, the operation was stopped, and air was used to check for leaks at external pressure (0.1 MPa / 2 minutes hold), but no air leakage from the module cut end face was observed. It was.

When the module was disassembled and the hollow fiber membrane was taken out and the outer surface was observed with an SEM, no abnormalities such as scratches were observed. The measured single yarn water permeability is 480L ^/ h ^/ m 2 ^/ 100kPa was little change.
In addition, the hollow fiber membrane bundle in the vicinity of the interface part (inner end face) of the adhesive fixing layer was scraped off and the interface was observed, but the hollow fiber bundle did not leave a trace of the cloth plate (not affected). confirmed.
When the adhesive fixing layer was divided in half and the height of the bias regulating member / adhesive fixing layer thickness was measured, it was 8/55 = 0.15 times.

[Comparative Example 1]
Example except that the same composition as the epoxy resin for forming the adhesive fixing layer was used as the columnar insert at the end of the hollow fiber membrane bundle as a cross shape having a height of 85 mm, a width of 138 mm, and a thickness of 5 mm Using the same hollow fiber membrane module as in No. 1, raw water was supplied only from the lower end face of the module and filtration was performed.
The separation distance between the cross plate and the rectifying cylinder was 10 mm, the height of the cross plate in the adhesive layer was 45 mm, and the distance from the inner end surface of the adhesive fixing layer to the cross plate was 15 mm.

  The operation was stopped after the flushing operation was performed when the filtration operation was performed for one month. A leak check was performed using air at an external pressure (0.1 MPa / 2 minutes hold), but a large number (30) of air leaks from the module cut end face were observed.

When the module was disassembled and the hollow fiber membrane was taken out and the outer surface was observed with an SEM, no abnormalities such as scratches were observed. The measured single yarn water permeability is 480L ^/ h ^/ m 2 ^/ 100kPa was little change.

  Moreover, the hollow fiber membrane bundle near the interface part (inner end face) of the adhesive fixing layer was scraped off and the interface was observed. As a result, it was confirmed that the hollow fiber bundle left a trace of the columnar insert. The adhesive fixing layer was divided in half, and the insert height / adhesive fixing layer thickness was measured and found to be 45/55 = 0.82 times.

  According to the hollow fiber membrane module of the present invention and the external pressure filtration method using the hollow fiber membrane module, the life of the hollow fiber membrane module can be extended even though the production cost is not increased because the components and the manufacturing process are hardly changed. A yarn membrane module is provided. According to the external pressure filtration method using this hollow fiber membrane module, it is possible to stably produce excellent quality filtered water over a long period of time, and it is particularly suitable as a security filter for use in ultrapure water production equipment. The hollow fiber membrane module can also be used as a pyrogen removal filter used in water for injection production facilities.

  DESCRIPTION OF SYMBOLS 1 ... Hollow fiber membrane module, 2 ... Hollow fiber membrane, P ... Opening of hollow fiber membrane, 3 ... Hollow fiber membrane bundle, 5 ... Housing, 7A, 7B ... Adhesion fixed layer, 19 ... Upper nozzle (fluid inlet / outlet), 21 ... Lower nozzle (fluid inlet / outlet), 10a, 11a ... Pipe line (fluid inlet / outlet), 25A, 25B ... Cross plate (bias restricting member), 25k, 25s ... Outer end portion of bias restricting member, 25m, 25t ... Inner end of the bias regulating member, 27 ... Normal pan (rectifier tube), 27b ... Channel hole, 28 ... Skirt pan (rectifier), 29 ... Diffusion restraint, 71, 73 ... Outer end surface of the adhesive fixing layer 72, 74 ... inner end face of the adhesive fixing layer, A1 ... first area, A2 ... second area, d1, d2 ... separation width between the bias regulating member and the rectifying cylinder.

Claims (10)

A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes having openings at both ends, a housing for housing the hollow fiber membrane bundle, and both ends of the hollow fiber membrane bundle are bonded and fixed to the housing, and the hollow fiber An adhesive fixing layer that partitions a first region where the opening of the membrane is exposed and a second region communicating with the first region across the hollow fiber membrane; and a fluid inlet / outlet provided in the housing A hollow fiber membrane module comprising:
A bias regulating member disposed in at least one end of the hollow fiber membrane bundle in order to reduce the density distribution bias of the plurality of hollow fiber membranes;
A rectifying cylinder enclosing a part of the end side of the hollow fiber membrane bundle,
The bias regulating member is included in the adhesive fixing layer,
A part of the flow straightening cylinder is fixed to the adhesive fixing layer,
The hollow fiber membrane module, wherein the bias regulating member and the rectifying cylinder are separated in the longitudinal direction of the hollow fiber membrane bundle in the adhesive fixing layer. The adhesive fixing layer has an outer end surface that is flush with an end surface of the hollow fiber membrane bundle from which an opening of the hollow fiber membrane is exposed, and an inner end surface formed in the rectifying cylinder,
The bias regulating member has an outer end portion that extends along the longitudinal direction of the hollow fiber membrane bundle and is flush with the outer end surface, and an inner end portion that is disposed in the adhesive fixing layer. ,
2. The hollow according to claim 1, wherein a length from the outer end portion to the inner end portion of the bias regulating member is smaller than a length from the inner end portion to the inner end surface of the adhesive fixing layer. Yarn membrane module.   The hollow fiber membrane module according to claim 1 or 2, wherein a value obtained by dividing the height of the bias regulating member by the thickness of the adhesive fixing layer is 0.1 times or more and less than 0.5 times. .   In both of the adhesive fixing layers formed at both ends of the hollow fiber membrane bundle, the bias regulating member is included, respectively, and a part of the rectifying cylinder is fixed, and both the adhesive fixing layers are in the adhesive fixing layers. 4. The hollow fiber membrane module according to claim 1, wherein the bias regulating member and the rectifying cylinder are separated from each other in a longitudinal direction of the hollow fiber membrane bundle.   The hollow fiber membrane module according to any one of claims 1 to 4, wherein the bias regulating member has a flat plate shape extending along a longitudinal direction of the hollow fiber membrane bundle.   The hollow fiber membrane module according to any one of claims 1 to 5, further comprising a net-shaped drift suppressing portion attached to the outer periphery of the hollow fiber membrane bundle.   The hollow fiber membrane module according to claim 6, wherein the drift suppressing portion is wound around an outer periphery of the hollow fiber membrane bundle, and the number of turns is single.   The hollow fiber according to any one of claims 1 to 7, wherein the flow straightening tube is formed with a plurality of flow path holes along a circumferential direction, avoiding a side facing the inlet / outlet. Membrane module.   The hollow fiber membrane module according to any one of claims 1 to 8, wherein the bias regulating member is disposed in the adhesive fixing layer so as to avoid a side facing the entrance / exit. A filtration method using the hollow fiber membrane module according to any one of claims 1 to 9,
A filtration method, wherein treated water is introduced into at least one of the first region and the second region, and the filtrate after permeating through the hollow fiber membrane is discharged from the other region.

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