JPS6130806B2 - - Google Patents

Description

[Detailed Description of the Invention] Filter press type ion exchange membrane electrodialysis equipment (hereinafter referred to as dialysis equipment) is widely used for concentrating and desalinating seawater, and for removing electrolytes from solutions containing other electrolyte substances. There is. In general, the dialysis apparatus uses a cation exchange membrane and an anion exchange membrane alternately through a gasket for a concentration chamber and a gasket for a dilution chamber, each of which has a supply/drainage fluid communication hole, a distribution section, and an energization cutout in the frame. The dialysis section consists of a plurality of concentration chambers and dilution chambers. The basic structure is to provide an anode chamber and a cathode chamber at both ends of the dialysis section and tighten them. When a dialysis device with the above structure is used industrially, the number of concentration chambers and dilution chambers becomes extremely large, and it is extremely difficult to assemble the dialysis device by tightening these chambers to form a dialysis section. In addition, the dialysis device may not be tightened sufficiently, and fluid may leak from the tightened portions. Therefore, in general, the dialysis unit is divided into a plurality of stacks, and a clamping frame having a space inside the frame and an ion exchange membrane support mechanism in the space is provided at both ends of the stack. After tightening the stack, the dialysis machine is constructed. In addition, fluid is supplied and discharged into the dialysis machine through fluid supply and drainage communication holes provided in the gasket and the negative and positive ion exchange membranes. It is difficult to supply fluid throughout the dialysis machine due to the dialysis machine. Therefore, in a dialysis machine composed of a plurality of stacks as described above, a liquid supply frame is provided between the clamping frames provided at both ends of the stack and the clamping frames provided on the adjacent stacks, and the dialysis machine is Liquid is supplied from the outside to the supply/drainage communication hole for supplying and discharging the concentration chamber liquid and dilution chamber liquid. Also,
There is also a dialysis device that uses a frame that has the functions of a tightening frame and a liquid supply frame.

By providing the above-mentioned tightening frame and liquid supply frame, it has become possible to improve the workability of assembling a large-sized dialysis apparatus and to uniformly supply liquid over the entire dialysis apparatus.

However, on the other hand, by providing the tightening frame and the liquid supply frame, the number of nozzles attached to the dialysis apparatus increases significantly, and the piping etc. when assembling the dialysis apparatus becomes complicated. And, one of the effects of providing a tightening frame is
As a result, the improvement of the assembly workability of the dialysis machine was hindered. That is, the liquid supply frame is provided with a nozzle for supplying the concentration chamber liquid and the dilution chamber liquid from the outside to the liquid supply/drainage communication hole, and the liquid supply frame and/or the tightening frame are provided with nozzles for supplying the liquid supply frame and the /Or a nozzle is provided for supplying and discharging the clamping frame liquid into the space of the clamping frame. In addition, the frame, which has the functions of a tightening frame and a liquid supply frame, has a nozzle for supplying liquid from the outside to the liquid supply/drainage communication hole, and a nozzle for supplying and discharging liquid to the space. It is provided.

The present invention is a frame structure for eliminating the complication of piping caused by the increase in the number of nozzles in larger conventional dialysis machines, and the structure of the clamping frame or the clamping frame and the liquid supply frame. The present invention relates to a frame structure in which nozzles and piping provided outside a dialysis apparatus for supplying and discharging liquid to a space in the frame can be eliminated. That is, the present invention provides a frame body having a space in the frame and an ion exchange membrane support mechanism in the space,
and a frame structure comprising a gasket having an energizing notch, a fluid supply/drainage communication hole, and a flow distribution portion communicating the energization notch and the fluid supply/drainage communication hole in the frame,
The frame and the gasket are assembled such that the space in the frame overlaps the current-carrying notch in the gasket, and
The frame structure for a filter press type electrodialysis apparatus is characterized in that a liquid supply groove to the frame structure is formed by the flow distribution section.

In the present invention, the frame has a space that becomes a current-carrying surface when a dialysis apparatus is constructed. and,
The space has an ion exchange membrane support mechanism for preventing the ion exchange membrane adjacent to the frame from sinking into the space. Other structures can be selected and set as appropriate depending on the manner of use. For example, the frame structure of the present invention can be used as a tightening frame for a dialysis machine in which a fluid supply frame and a clamping frame are provided independently, a dialysis machine in which a fluid supply frame is not provided between each stack, or a dialysis machine that does not have a fluid supply frame at all. When a body is used, the frame body has, in addition to the space, a fluid supply/drainage communication hole for supplying and/or discharging fluid to the dilution chamber and concentration chamber of the dialysis machine, respectively. A structure having a section is used. Furthermore, when the frame structure of the present invention is used as a frame of a dialysis machine having a frame having the functions of a fluid supply frame and a tightening frame, the frame is formed in the space and within the dialysis machine. A structure having a nozzle for supplying and/or discharging liquid from the outside to the liquid supply/drainage communication hole is used.

Generally, inside a dialysis machine, there is a supply/drainage communication hole for supplying liquid to the dilution chamber and concentration chamber, respectively, and a supply/drainage communication hole for discharging the liquid from the dilution chamber and concentration chamber, respectively. Each has one or more holes.

The liquid supply/drainage communication hole and nozzle provided in the frame are as follows:
The installation position and the number of installations are appropriately selected depending on the method of flowing the liquid to each stack of the dialysis apparatus. For example, depending on the way the liquid flows and the presence or absence of a liquid supply frame, the liquid supply/discharge communication hole and the nozzle may be provided so as to communicate with all the liquid supply/discharge communication holes, or the liquid may be supplied to the dilution chamber and the concentration chamber. A mode in which the dilution chamber is provided so as to communicate only with the supply/drainage communication hole to which the liquid is supplied, and a mode in which it is provided in such a way that it communicates only with the liquid supply/drainage communication hole which discharges the liquid in the dilution chamber and the concentration chamber, respectively, and a mode in which the liquid is supplied to the dilution chamber. A mode in which the fluid supply/drainage communication hole is provided so as to communicate only with the fluid supply/drainage communication hole for discharging the liquid in the dilution chamber and a fluid supply/drainage communication hole for discharging the liquid in the concentration chamber; There are some embodiments in which it is provided so as to communicate only with the drainage communication hole. When the liquid is supplied to the dilution chamber and the concentration chamber at one end of each stack or dialysis machine, and the liquid is discharged from the dilution chamber and the concentration chamber, the frame located at the other end is used. The body does not need to be provided with a fluid supply/drainage communication hole or nozzle. The material of the frame is not particularly limited, and generally, synthetic resin or other suitable elastic material such as rubber is used as is, or synthetic resin or metal coated with rubber is used.

The ion exchange membrane support mechanism is provided in the space of the frame as described above. The ion exchange membrane support mechanism may have any shape as long as it does not allow the ion exchange membrane to collapse into the space of the frame when the dialysis device is configured, and may be in the form of a lattice or perforated plate used in conventional tightening frames. , and one having a blind-shaped liquid flow path for supplying the liquid to the space is preferably used. The ion exchange membrane support mechanism may be integrated with the frame by integral molding, welding, or adhesion. However, in order to reduce the electrical resistance caused by the ion exchange membrane support mechanism in the space that becomes the current-carrying part, it is not possible to improve the strength of the ion exchange membrane support mechanism. There is no. Therefore, the ion exchange membrane support mechanism integrated with the frame may be damaged. In that case, it is necessary to replace the entire frame, which is economically disadvantageous. In order to minimize the effects of damage to the ion exchange membrane support mechanism, it is preferable to have a flexible structure that allows the ion exchange membrane support mechanism to be attached to and removed from the space in the frame. Due to the flexible structure, even if the ion exchange membrane support mechanism is damaged, it is not necessary to replace the entire frame, and only the ion exchange membrane support mechanism needs to be replaced. The shape of the flexible ion exchange membrane support mechanism can be the same as that of the above-mentioned integrated structure, but it may also be filled with a net-like or fibrous filler.

FIG. 1 shows an eleventh embodiment of the frame in which the ion exchange membrane support mechanism can be attached and detached in the space. Figure 2 a is the first
A sectional view taken along line A-A' in the figure is shown. The ion exchange membrane support mechanism 4 is inserted into the space 3. In FIG. 2a, the ion exchange membrane support mechanism and the periphery of the space of the frame 1 are in direct contact with the fitting portion 11 of the ion exchange membrane support mechanism 4. It may also be shaped like a key as shown in b.

The material for the ion exchange membrane support mechanism 4 may be selected as appropriate depending on the solution used, but plastic materials such as polyvinyl chloride resin, polypropylene resin, polyethylene resin, polystyrene resin, and polyester resin are generally used.

The most important requirement in the present invention is that the frame body and a gasket have an energizing notch, a fluid supply/drainage communication hole, and a flow distribution part that communicates the energization notch and the fluid supply/drainage communication hole in the frame; The space part of the frame body and the current-carrying notch part of the gasket should be combined so that they overlap. With this structure, nozzles and piping for supplying and discharging liquid to the clamping frame space provided outside the dialysis machine, which were problems with conventional dialysis machines having a clamping frame, are eliminated. The liquid can be supplied and discharged from the flow distribution section of the gasket. That is, the gasket is connected to the supply/discharge communication hole for supplying and discharging the liquid to the dilution chamber and/or the supply/discharge communication hole for supplying and discharging the liquid to the concentration chamber in the dialysis apparatus. Any shape may be used as long as it has a drainage communication hole and a flow distribution section for supplying and discharging liquid from the supply and drainage communication hole to the space of the frame. In general, the concentration chamber gasket or dilution chamber gasket used in conventional dialysis equipment can be used as is.
Particularly, it is preferable to use a gasket for the concentration chamber because it can reduce the resistance caused by the liquid in the space of the frame.

The frame structure of the present invention will be explained using FIGS. 3 and 4. FIG. 3 shows one embodiment of the frame structure of the present invention, and FIG. 4 shows a sectional view taken along line BB' in FIG. Reference numeral 1 denotes a frame body, which has a lattice-shaped ion exchange membrane support mechanism 4 and a fluid supply/drainage communication hole 5 in a space 3 . Further, the ion exchange membrane support mechanism 4 is provided with a liquid flow path 7 so that the liquid supplied to the space flows throughout the space. 8 is a bolt hole for tightening. 2 is a gasket. The gasket has an energizing notch 3', a fluid supply/drainage communication hole 5, and
and a flow distribution section 6. The frame and the gasket are assembled so that the space and the current-carrying notch overlap to form the frame structure of the present invention. In FIG. 4, the stack is located on the left side. In FIG. 4, 9 is an ion exchange membrane. The liquid passes from the supply/drainage communication hole of the gasket through the distribution section to the current-carrying notch of the gasket.
In turn, the liquid is supplied to the space of the frame, and is discharged to the fluid supply/drainage communication hole through the distribution part of the gasket.

The above-mentioned frame structure eliminates the need to provide external nozzles and piping for supplying and discharging liquid to the space in the clamping frame, which hinders the assembly work of conventional dialysis machines. Summer.

However, in the frame structure described above, when the dialysis device is assembled, the flow of liquid is not uniform on the ion exchange membrane adjacent to the ion exchange membrane support mechanism, and the liquid partially flows around the ion exchange membrane support mechanism. When electricity is applied, a neutral disturbance phenomenon occurs on the ion exchange membrane, which may cause scale formation. Further, the ion exchange membrane support mechanism is generally made of a hard material, and the ion exchange membrane may be damaged when the stack is tightened. The present invention also provides a frame structure that can prevent these phenomena by providing a spacer in the current-carrying notch of a gasket that is combined with the frame.
That is, the present invention provides a frame body having a space in the frame and an ion exchange membrane support mechanism in the space, an energizing notch in the frame, a fluid supply/drainage communication hole, and a connection between the energization notch and the fluid supply/drainage. A frame structure consisting of a gasket and a spacer having a flow distribution part that communicates with a communication hole, the frame and the gasket being assembled so that the space in the frame overlaps the energizing notch of the gasket, and further energizing the gasket. A frame structure for a filter press type electrodialysis apparatus is also provided, which is assembled so that a spacer is located in a notch, and a liquid supply groove to the frame structure is formed in the distribution part. .

FIG. 5 shows a typical example of the frame structure of the present invention in the above-mentioned embodiment, and FIG. 6 shows a sectional view taken along line CC' in FIG. As shown in the figure, the spacer 10 is provided in the current carrying notch 3' of the gasket 2 to prevent the ion exchange membrane 9 of the stack from being damaged by the ion exchange membrane support mechanism 4. In addition, since the liquid supplied from the supply/drainage liquid communication hole through the gasket distribution section 6 is uniformly dispersed and flows over the ion exchange membrane 9 by the spacer 10, no neutral disturbance phenomenon occurs, and scale generation does not occur. It is also effective in preventing Further, by providing a spacer, it is not necessary to provide a liquid flow path in the ion exchange membrane support mechanism.

The spacer has a known shape and material, such as those that are conventionally provided in the current-carrying notches of gaskets constituting concentration chambers or dilution chambers. Regarding the shape, for example, Utility Model No. 44-1255, No. 44-
The net-like material shown in No. 1256 and the like is preferably used.

[Brief explanation of the drawing]

Figure 1 shows one embodiment of the frame in which the ion exchange membrane support mechanism can be attached and detached in the space, Figure 2a is a cross-sectional view taken along line A-A' in Figure 1, and Figure 2b is Figure 2 a
Another embodiment corresponding to FIG. 3 and FIG. 5 is an embodiment of the frame structure of the present invention, and FIG.
B' sectional view and FIG. 6 show the CC' sectional view of FIG. 5, respectively. 1 is a frame body, 2 is a gasket, 3 is a space part, 4 is an ion exchange membrane support mechanism, 5 is a fluid supply/drainage communication hole, 6 is a distribution part, 7 is a liquid flow path, 8 is a bolt hole for tightening, 9 is an ion exchange membrane and 10 is a spacer.

Claims (1)

[Scope of Claims] 1. A frame having a space in the frame and an ion exchange membrane support mechanism in the space, an energizing cutout, a liquid supply/drainage communication hole, and the energizing cutout in the frame. A frame structure including a gasket having a flow distribution portion communicating with a fluid supply/drainage communication hole, the frame and the gasket being assembled so that the space of the frame and the current-carrying notch of the gasket overlap; A frame structure for a filter press type electrodialysis apparatus, characterized in that a liquid supply groove to the frame structure is formed in the flow distribution section. 2. A frame having a space in the frame, an ion exchange membrane support mechanism in the space, an energizing cutout, a fluid supply/drainage communication hole in the frame, and a connection between the energization cutout and the fluid supply/drainage communication hole. A frame structure consisting of a gasket and a spacer having a flow distribution part that communicates with the gasket, the frame and the gasket are assembled so that the space of the frame overlaps the energizing notch of the gasket, and the energizing notch of the gasket overlaps with the gasket. Combined so that the spacer is positioned,
A frame structure for a filter press type electrodialysis apparatus, characterized in that a liquid supply groove to the frame structure is formed in the distribution section.