JPS6038963B2 - Separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separation device for separating some components in a liquid, in which a tape-shaped separation membrane made of synthetic resin is wound so that one continuous end overlaps another continuous end. A separation element that is turned into a cylindrical shape, and is characterized in that the pores at one continuous end of a tape-like separation membrane are crushed in advance to form a film, in which a liquid is caused to flow along the separation membrane, The objective is to separate a portion of a liquid, and to provide an inexpensive and high-performance separation device.

One continuous end of a tape-shaped perforated sheet made by a conventional method is wound so as to overlap the other end, and a part or all of the synthetic resin perforations and aggregate in the partially overlapped portion are thermally melted and bonded. The method of forming the tube into a cylindrical shape had the following drawbacks. If the aggregate and hole material are different, there will be a difference in melting point when the overlapping parts are melted and bonded, so one of the materials will melt first, and the whole will melt only when the temperature rises further. This phenomenon occurs. For example, when the melting point of the hole material is low, when only the hole is melted and bonded, [when the hole and a part of the aggregate are fused, both the hole and the aggregate There are three possibilities when melting.

In the case of 'I', the adhesive strength is weak because the aggregate is not bonded, and in the case of 'I', shrinkage occurs when the hole part melts and hardens into a film, causing the boundary with the hole part to shrink. Cracks may appear or pinholes may form.

In the case of low, it is located between the thorns and has the drawbacks that it is extremely difficult to control and that the same phenomenon as that of shiichi occurs if the amount of hole-forming material is not large. In addition, in the overlapping part, the sheet on the upper side forms a step with the lower sheet, and since the sheets overlap in a stretched state, there are many problems such as cracks appearing at the boundary with the perforation part during thermal melting. Occurred.

Similarly, the method of crushing the holes with an adhesive or solvent to form a film has the disadvantage that the crushing is uneven, resulting in a lack of uniformity of the product. The present invention eliminates the above-mentioned drawbacks; heat bonding is extremely easy to perform, the strength of the bonded part after forming into a tube is high, it is possible to produce inexpensive, stable, endless tubes, and it is possible to easily produce large quantities of tubes. can provide a separation element.
This will be explained below using figures. FIG. 1 shows a partially enlarged schematic cross-sectional view of a tape-like porous separation membrane used in the present invention, in which 1 is a microporous separation membrane, 2 is the inside and surface of a porous body 3 such as a nonwoven fabric. This shows the hole formed in the hole. FIG. 2 is a perspective view of a hole separation element used in the present invention, and shows a tape-shaped separation membrane 1.
One continuous end a was overlapped with another continuous end b and rolled up into a cylindrical shape to form a separation element.

The overlapping portion 5 is bonded by thermal bonding, adhesive bonding, high frequency heat bonding, ultrasonic bonding, or the like. Fig. 3 shows a partially enlarged schematic cross-sectional view of a conventional overlapping part, where 8 shows the melted and bonded part, 6 and 7 show the boundaries between the melted filmed part and the perforated part, and cracks in this part are particularly noticeable. It was a problem.

FIG. 4 is a plan view of the tape-shaped separation membrane of the present invention, in which numeral 9 indicates a portion that has been formed into a film by heat or pressure, and constitutes an embodiment in which both ends of the tape are formed into a film.

Depending on the case, only one end may be formed into a film.
FIG. 5 shows an embodiment of the present invention, in which the overlapped portions 10 are thermally melted and bonded by ultrasonic waves or the like.

FIG. 6 is a diagram illustrating the operating principle of a separation device equipped with the separation element of the present invention, in which 4.5
The stock solution is made to flow through a cylindrical separation element 13 made up of nine tubes ◇, and the permeate 14 separated on the surface of the hole-forming body is received by an outer container 15 with 27 inner walls and taken out from a permeate collection pipe 16.

Valves 17 and 18 are provided so that required operating conditions can be set, and pressure gauges 19 and 20 are provided so that the circulating flow rate, pressure, etc. can be adjusted. FIG. 7 shows an example of a method of forming a separation membrane into a film using a heating roll, in which the separation membrane is passed through a heating roll 21 provided with a convex portion 22, and the portion 9 heated and pressurized by the convex portion becomes a film. do.

Both heating rolls may be iron rolls, or one of them may be an elastic rubber roll.

Similarly, even if the heating roll has a structure in which the protrusions 22 touch each other, it is also possible to use a roll in which a clearance is provided without making them contact each other. The latter method is more stable as a product when it comes to uniform heating and pressurization. Example 1 Synthetic resin A synthetic resin solution was prepared by dissolving 14 parts of heat-resistant polyvinyl chloride (trade name: Nikatemp) in 56 parts of tetrahydrofuran as a solvent, and adding 3 parts of inpropyl alcohol as a non-solvent. A porous polyester nonwoven fabric (thickness: 0.2 mm) was impregnated and then evaporated and dried to obtain a separation membrane with an average pore diameter of 0.4 mm.

The separation membrane was heated to a temperature of 15,000 and passed through a roll having a clearance of 0.8 between the protrusions having three central ribs to form a film at the ends of the separation membrane.

The tape-shaped (15 ribs) separation membrane has an inner diameter of 4 mm as shown in Figure 2.
5th side? Roll it up around the core (not shown) so that
The overlapped parts (two legs in the overlap) were bonded together using ultrasonic waves. When the pressure resistance of the tube thus obtained was checked, it did not burst even at a pressure of 10k9/cm. Also, the bubble point value was 1.5 kg/, which is almost the same as that of the perforated sheet. Also, the yield of the product is 9
It showed a high value of 8%. Conventional tubes made of tape-like separation membranes that are not film-formed have a pressure resistance of 4k9/some that burst with crucian carp, and the bubble point is 0.2k9.
This figure indicates that a remarkable effect has been achieved, considering the fact that there were some products with a low productivity of 50%, and that the productivity of the product was as low as 50%.

Next, this separation element is used as a device as shown in FIG.
% of water-soluble electrodeposition paint was flowed into a tube at a pressure of 3.5 k9/h and a linear speed of 3 m/sec and used for separation, the solid content of the permeate was 0.5% after 30 hours. were obtained stably.

The price of the separation element obtained in this way is about 1/2.5 of the price of a conventional separation element using a cellulose membrane, making it economically inexpensive. Since the separation element in the present invention is made using a tape-like separation membrane, various cylindrical bodies with different internal fleas can be manufactured by changing the tape, and since it is only necessary to wrap it around the core, the cylindrical body can be You can create endless items.

Further, since the overlapping portion spirally surrounds the cylindrical body, it is possible to prevent the cylindrical body from breaking and has the strength to maintain the cylindrical shape. The separation membrane according to the present invention may be any membrane having the ability to separate particles and high molecular weight substances in a liquid, and can also be applied to an asymmetric membrane having a dense layer on the surface and a support layer on the back surface.

Among them, the average pore diameter of the porous separation membrane according to the present invention is 20
A thickness in the range of 00A to 10A was particularly effective in terms of permeation separation power, and a thickness in the range of 0.05 to 0.3A was effective. In addition, non-woven fabrics, woven fabrics, etc. can be cited as porous materials that form micropores, and since the porous materials themselves, which serve as aggregates, have high mechanical strength, aggregates for forming micropores and tubes are used. It has the function of reducing deflection and elongation when formed into a shape, and also has the effect of reinforcing against hydraulic pressure when used as a separation device. Fusion of the synthetic resin membrane and the bone membrane can be considered for the fusion of the overlapping parts of the porous body and the porous layer, but in addition to adhesion by melting only the synthetic resin membrane, it is possible to bond the bone membrane by melting only the synthetic resin membrane. The adhesive strength is greater when the membrane and aggregate are integrated by melting some or all of them. Further, the heating temperature according to the present invention may be selected depending on the thermoplastic synthetic resin, and may be set at a temperature at which the film is formed and the bubble point does not decrease. Further, there are various bonding methods such as ultrasonic bonding, high frequency dielectric heating, and bonding as described above, and ultrasonic bonding is particularly effective.

By applying ultrasonic waves of 2 peach HZ (adjustment range 15 to 2 Hz) using an electrode called a horn, the bonding process can be adjusted freely by adjusting the inside of the tip of the horn and the pressure.

In particular, when bonding synthetic resin porous bodies, use a shaking medium of 20
A range of 100 to 100 is particularly good; deviations from this range result in poor adhesion or uneven adhesion, making it impossible to put it to practical use. The adhesion speed is usually about 3 to 20 minutes per minute. As described above, the present invention has great industrial value.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged schematic cross-sectional view of a tape-shaped porous separation membrane according to an embodiment of the present invention, FIG. 2 is a perspective view of an embodiment of a separation element used in the present invention, and FIG. 3 is a conventional FIG. 4 is a plan view of a tape-shaped separation membrane according to the present invention, FIG. 5 is a partially enlarged schematic cross-sectional view of the overlapped portion, FIG. FIG. 7 is a diagram illustrating the operating principle of the separation apparatus according to the invention. FIG. 7 is a plan view of an embodiment of the apparatus for manufacturing the separation membrane of the invention. 1...Separation membrane, 2...Characterization, 3...
... Porous body, 5 ... Overlapping part, 8 ...
... Melting adhesive part, 9... Filming part. Figure 1 Figure 3 Figure 5 Figure 2 Figure 4 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. A tape-shaped microporous separation membrane made of thermoplastic synthetic resin is wound so that one continuous end in the width direction is overlapped with another continuous end in the width direction, and the overlapping portion is In a separation device equipped with a separation element formed into a cylindrical shape by thermally melting and bonding parts or all of the membranes, the continuous widthwise ends of the tape-shaped separation membranes are heated or pressed in advance before being superimposed and bonded. A separation device characterized in that the micropores are crushed to form a film. 2. The separation device according to claim 1, wherein one continuous end of the tape-like separation membrane is pressed by a heated roll to crush the micropores and form a film. 3. The separation device according to claim 1, wherein the tape-like separation membrane is a tape-like sheet with micropores formed in aggregate. 4. The separation device according to claim 1, wherein the overlapping width is narrower than the width of the film formed in advance. 5. The separation device according to claim 1, wherein the overlapping portions are bonded by ultrasonic waves. 6. The separation device according to claim 5, wherein the amplitude of the ultrasonic wave is in the range of 20 to 100 μ. 7 The separation membrane is formed by adhering a uniform synthetic resin solution made of synthetic resin, a solvent, and a non-solvent to the aggregate and then volatilizing it to dryness, or by applying a uniform synthetic resin solution made of synthetic resin and a solvent to the aggregate. 2. The separation device according to claim 1, which is a sheet obtained by immersing the sheet in a non-solvent and drying the sheet. 8. The separation device according to claim 1, wherein the separation membrane has a thickness of 0.05 to 0.3 mm. 9. The separation device according to claim 1, wherein the separation membrane has an average pore diameter in the range of 200°A to 10μ.