JP2003126864A - Gasket for electrodialysis apparatus and electrodialysis apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of electrodialysis by increasing the stability of a flow path of a liquid to be treated without increasing pressure loss, and to flow the liquid to be treated within a predetermined flow rate range. Provided is a gasket for an electrodialysis apparatus having excellent operability, and an electrodialysis apparatus which is excellent in controllability and economy of electrodialysis in response to an increase in the size of the apparatus. SOLUTION: Two kinds of ion exchange membranes are alternately arranged in parallel between electrode plates formed in a flat plate shape, and the electrodes are formed while flowing a liquid to be treated into flow paths formed between the adjacent ion exchange membranes. An electrodialysis device gasket 6 applied to an electrodialysis device that performs electrodialysis by applying a voltage between the plates, wherein a plurality of gaskets 6 are disposed between the ion exchange membranes so that their peripheral portions are in close contact with each other, and each of the gaskets has an independent inside. Meandering flow paths 11 and 12 of the liquid to be treated having a flow pattern composed of a series are formed to penetrate the gasket main body 10 on the front and back surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodialysis device for performing treatment such as desalting on a liquid to be treated by electrodialysis using two types of ion-exchange membranes, and a gasket for the electrodialysis device applied to the electrodialysis device. Regarding

[0002]

2. Description of the Related Art In general, an electrodialysis device has a gasket formed between an anion exchange membrane and a cation exchange membrane between a cathode plate and an anode plate, which are formed in a flat plate shape. The plate-shaped gasket is formed by alternately stacking a plurality of layers, and a flow path through which the processing liquid flows is formed in the flat gasket. Then, gaskets that are adjacent to each other with an anion exchange membrane or a cation exchange membrane sandwiched between them, the liquid to be treated such as seawater to be desalted flows in the passage of one gasket, and the passage of the other gasket in the passage. For example, a liquid to be treated such as seawater that accumulates desalted salt flows.

FIG. 4 is a plan view of a gasket used in a conventional electrodialysis device. This gasket A is described in Japanese Patent Application Laid-Open No. 57-24604 (in this publication, it is referred to as "chamber frame") and has a thickness of 0.7.
It is 5 mm. In this gasket A, two meandering flow paths B through which the liquid to be treated meanders are formed, and both meandering flow paths B are connected in series by a connecting path C. On the surface of the gasket A, one of the two types of ion-exchange membranes, the ion-exchange membrane D, is arranged, and on the back surface of the gasket A, the other type of ion-exchange membrane (not shown) is arranged. . In this gasket A, the meandering flow path B that meanders is formed, so that the ion exchange membrane D can be effectively used throughout.

[0004]

The conventional electrodialyzer has the following problems.

(1) Due to the increase in the area of the gasket A with the increase in size of the electrodialyzer, it becomes necessary to widen the width of the meandering flow path B formed in the gasket A. But,
When the width of the meandering flow path B is widened, the laminated body of the gasket A having a small thickness and the two kinds of Yin and Yang ion exchange membranes is pressed with a predetermined pressure from both sides via the electrode plates. The two types of Yin and Yang ion exchange membranes, which are opposed to each other across the channel, are deformed or come into contact with each other at the opening of the meandering flow channel, narrowing the flow channel and causing a partial pressure loss. There was a problem that the uniform flow of the liquid was impaired and the efficiency of electrodialysis deteriorated.

(2) Since there is only one flow path for the liquid to be treated, the two types of ion-exchange membranes adjacent to the gasket A are contacted and deformed in the flow path, or solid matter is attached to the flow path. In the case where the liquid to be treated is clogged or the like, it becomes difficult to flow the liquid to be treated within a predetermined flow rate range, and there is a problem that the electrodialysis device lacks operational stability.

(3) It is necessary to adjust the flow rate of the liquid to be supplied to the electrodialysis device in accordance with changes in dialysis conditions such as the components and viscosity of the liquid to be processed. There was a problem that the flow path was only one series and the flow rate could not be adjusted for each site between the ion exchange membranes, and the controllability of electrodialysis was lacking.

(4) A contact prevention member is required to prevent contact between the two types of ion-exchange membranes D, which are adjacent to each other with the gasket A sandwiched between them, but this causes an increase in manufacturing cost, which is economical. There was a problem of lacking in sex.

The present invention has been made to solve the above-mentioned conventional problems, and can improve the efficiency of electrodialysis by increasing the stability of the flow path of the liquid to be treated without increasing the pressure loss, and at the same time, to treat the liquid to be treated. Provide a gasket for electrodialyzer that can flow liquid within a predetermined flow rate range and provide electrodialyzer with excellent controllability and economy of electrodialysis in response to the increase in size of the device. The purpose is to

[0010]

In order to achieve the above object, the gasket for electrodialyzer of the present invention has two types of ion-exchange membranes of Yin and Yang, which are alternately arranged in parallel between electrode plates formed in a flat plate shape. A gasket for an electrodialysis device applied to an electrodialysis device for performing electrodialysis by applying a voltage between the electrode plates while flowing a liquid to be treated in a flow path formed between the adjacent ion exchange membranes, The peripheral portions of the ion-exchange membranes are closely attached to each other, and the channels of the liquid to be treated formed in a serpentine channel pattern made up of a plurality of independent lines are formed inside the gasket body. It is characterized by being.

Therefore, according to the present invention, the stability of the flow path of the liquid to be treated can be improved without increasing the pressure loss, and the efficiency of electrodialysis can be improved, and the liquid to be treated can be flown within a predetermined flow rate range. It is possible to provide a gasket for electrodialyzer, which is excellent in operability.

An electrodialyzer using the gasket for electrodialyzer of the present invention comprises a gasket for electrodialyzer and an ion exchange membrane laminated at a predetermined interval via the gasket for electrodialyzer. It is characterized by having.

Therefore, the stability of the flow path of the liquid to be treated can be improved without increasing the pressure loss, and the efficiency of electrodialysis can be improved, and the controllability and economic efficiency of electrodialysis can be coped with as the apparatus becomes larger. It is possible to provide an excellent electrodialysis device.

[0014]

A gasket for an electrodialyzer according to claim 1 is characterized in that ion-exchange membranes of two types of Yin and Yang are alternately arranged in parallel between electrode plates formed in a plate shape, and the ion-exchange membranes between adjacent ion exchange membranes. A gasket for an electrodialysis device, which is applied to an electrodialysis device for performing electrodialysis by applying a voltage between electrode plates while flowing a liquid to be treated in a flow path formed in Are closely arranged, and the inside of the gasket body is formed with a flow path for the liquid to be treated, which is formed in a meandering flow path pattern composed of a plurality of independent lines.

With this configuration, the following effects can be obtained.

(1) Since a plurality of independent series of meandering flow paths of the liquid to be treated are formed in parallel in the gasket main body, compared with the case where there is one flow path, the flow paths of the liquids flowing through the respective flow paths are different from each other. The flow rate of the processing liquid can be reduced to reduce the pressure loss, and the liquid to be processed can be supplied to the flow path with a small amount of power, resulting in excellent operability.

(2) Since a plurality of flow paths for the liquid to be treated are formed in the gasket body as independent series, the width of the flow path can be narrowed when the total flow path cross-sectional area is constant.
As a result, the flow path is not narrowed due to the deformation of the gasket body or the ion exchange membrane, has excellent stability, and the electrodialysis device can be operated efficiently.

(3) Even if the ion exchange membranes arranged adjacent to the gasket body are contacted and deformed in the flow channel, or if solid substances are adhered to the flow channel and are clogged, they are blocked. It is possible to flow the liquid to be treated using a flow path that is not provided, to supply the liquid to be treated within a predetermined flow rate range, and it is excellent in operational stability of the electrodialysis device.

(4) The flow rate of the liquid to be treated to be supplied to each series of the electrodialysis device can be adjusted in accordance with the variation of the dialysis conditions such as the components of the liquid to be treated and the viscosity. Excellent in operating efficiency.

(5) Since the channel width of the channel can be narrowed, a contact preventing member for preventing contact between the ion exchange membranes adjacent to each other with the gasket interposed therebetween is unnecessary, and as a result, the manufacturing cost can be reduced. You can

Here, the flow path pattern is composed of a plurality of independently formed flow path series. Each of the flow path series is arranged in a continuous manner between the supply part and the discharge part of the liquid to be treated and between the supply part and the discharge part so as to meander or bend or linearly cover the surface of the ion exchange membrane. And a flow path portion formed as described above. The gasket body formed in a flat plate shape is punched out in a predetermined flow path pattern.

The gasket body is thinly formed in a flat plate shape, and may be made of synthetic resin such as urethane rubber or metal, or a metal plate whose front and back surfaces are covered with synthetic resin.

The ion-exchange membrane is composed of two types of flat plate-like membranes, an anion-exchange membrane and a cation-exchange membrane, and these membrane-like bodies are alternately laminated through the gasket body. To be

In the electrodialyzer gasket according to a second aspect, in the invention according to the first aspect, the gasket body is formed of an elastic material having a predetermined elasticity.

With this configuration, in addition to the function of claim 1,
The following effects are obtained.

(1) The gasket body can be brought into close contact with the surfaces of the two ion exchange membranes that are adjacent to each other with the gasket body sandwiched therebetween, and leakage of the liquid to be treated flowing through the flow path of the gasket body can be effectively prevented.

(2) Since the elastic material has a predetermined elasticity,
The space between the ion-exchange membranes on both sides can be reliably maintained, and the flow passage cross-sectional area of the liquid to be treated formed in each gasket body can be kept constant.

Here, the elastic material may be synthetic resin such as urethane rubber, foam synthetic resin, natural rubber or the like.

According to a third aspect of the present invention, in the gasket according to the first or second aspect, the gasket for an electrodialyzer is an ion exchange membrane adjacent to an innermost position of the serpentine portion of the flow path of the gasket body. And a fixed support member such as a spacer for fixing the gap between the electrode plates and the ion exchange membrane.

With this configuration, the following actions can be obtained in addition to the actions of claim 1 or 2.

(1) It is possible to prevent the partition walls that separate the meandering portions adjacent to each other of the respective flow paths in the gasket body from being moved by the liquid to be treated flowing in the meandering flow path, and the moved partition walls prevent the meandering flow paths from moving. It is possible to prevent the flow path from being blocked or the width of the flow path being narrowed.

The fixed support member may be a fastener such as a bolt, pin or boss, or
It may be an adhesive material such as an adhesive or an adhesive tape.

A gasket for an electrodialyzer according to a fourth aspect is the gasket for an electrodialysis device according to any one of the first to third aspects, wherein the gasket body comprises a rigid material having rigidity and an elastic material having elasticity sandwiching the rigid material. The composite material is formed and formed.

With this configuration, in addition to the operation of any one of claims 1 to 3, the following operation is obtained.

(1) The elastic material of the gasket main body can be adhered to both ion exchange membranes adjacent to each other with the gasket main body sandwiched therebetween, so that the sealing property prevents leakage of the liquid to be treated from the flow path of the gasket main body. Are better.

(2) It is possible to prevent the partition wall separating the meandering portions of each of the meandering flow passages in the gasket body from moving due to the pressure of the liquid to be treated flowing in the flow passages by the gasket rigid material. In addition, it is possible to prevent the meandering flow path from being blocked by the moved partition wall and from narrowing the flow path width of the meandering flow path.

(3) Since the rigidity of the gasket body is increased by the rigid material, the assembly of the gasket can be facilitated and the manufacturing efficiency can be improved.

Here, the elastic material may be, for example, synthetic rubber, foamed synthetic resin, natural rubber, or the like. As a rigid material,
For example, metal, synthetic resin, ceramic, etc. may be used.

The electrodialyzer gasket according to a fifth aspect of the present invention is the gasket according to the fourth aspect, wherein the rigid material is made of synthetic resin or metal.

With this configuration, in addition to the function of claim 4,
The following effects are obtained.

(1) When the rigid material is made of synthetic resin, the weight of the gasket body can be reduced, and the economy and durability are excellent.

(2) When the rigid material is made of metal, the thickness of the rigid material can be reduced, the thickness of the gasket body can be reduced, and the gap between the adjacent Yin and Yang ion exchange membranes can be reduced. Can be set small to increase the efficiency of electrodialysis.

An electrodialyzer according to a sixth aspect has a predetermined interval between the gasket for the electrodialyzer and the gasket for the electrodialyzer according to any one of the first to fifth aspects. And an ion exchange membrane that is laminated.

With this configuration, the following effects can be obtained.

(1) Since the plurality of independent channels of the liquid to be treated are formed in parallel in the gasket body, the flow rate of the liquid to be treated flowing through each flow passage is reduced to reduce the liquid to be treated. It can be supplied to the flow path and its operability is excellent.

(2) Since a plurality of independent series of flow passages are formed in the gasket body, the width of the flow passage can be narrowed when the total flow passage cross-sectional area is constant. It is not restricted by the deformation of the membrane, has excellent stability, and can operate the electrodialysis device efficiently.

(3) Even if the ion exchange membranes disposed adjacent to the gasket body are contacted and deformed in the flow channel, or solid substances adhere to the flow channel and are blocked, they are blocked. It is possible to flow the liquid to be treated using a flow path that is not provided, to supply the liquid to be treated within a predetermined flow rate range, and it is excellent in operational stability of the electrodialysis device.

(4) It is possible to adjust the flow rate of the liquid to be treated to be supplied to each series of electrodialyzers in accordance with the variation of the dialysis conditions such as the components of the liquid to be treated and the viscosity. Excellent in operating efficiency.

(5) The manufacturing cost can be reduced by eliminating the contact prevention member for preventing the contact between the ion exchange membranes adjacent to each other with the gasket interposed therebetween.

(Embodiment 1) FIG. 1 is a schematic exploded view of an electrodialyzer using a gasket for electrodialyzer of Embodiment 1 of the present invention, and FIG. 2 is an exploded view of the embodiment of the present invention. It is a top view of the gasket for electrodialysis machines of the form 1.

In FIG. 1, 1 is an electrodialyzer for electrodialyzing a liquid to be treated to be supplied, 2 is a cathode plate formed in a flat plate shape of the electrodialysis device 3, and 3 is an end thereof facing the cathode plate 2. The anode plates 4, 5 arranged on the side of the plate are anion exchange membranes and cation exchange membranes alternately laminated between the cathode plate 2 and the anode plate 3, and 6 is an anion exchange membrane adjacent to each other. 4 and the cation exchange membrane 5 and each anion, cation electrodes 2, 3 and anion,
A gasket for an electrodialysis device inserted between the cation exchange membranes 4 and 5, a case member 7 disposed outside the cathode plate 2 and having a treatment liquid supply portion 7a for supplying a treatment liquid, and 8 an anode plate 3 is a case member having a treatment liquid discharge portion 8a disposed on the outer side of the treatment liquid 3 for discharging the treatment liquid subjected to the electrodialysis treatment.

In FIG. 2, reference numeral 10 is a gasket main body formed of a thin flat plate made of urethane rubber or the like for the electrodialysis apparatus gasket 6, and 11 is a first series of meandering flow formed by meandering in the gasket main body 10. A channel 12, a second series of meandering channels 11 formed in parallel with the first series of meandering channels 11, and 11a, 12a of each of the meandering channels 11, 12 through which the electrodialysed liquid to be treated is discharged. Outlet, 11b,
12b is the inlet of each of the meandering flow paths 11 and 12 to which the processing liquid is supplied, and 13 is the first and second series of meandering flow paths 1.
A serpentine partition for separating 1 and 12 and a gasket body 10 for serpentinely forming each flow path.
A rectangular partition wall formed by projecting in a substantially rectangular shape from the peripheral portion of the, a communication hole and an outlet 11 provided in the adjacent anion and cation exchange membranes 4 and 5 and the electrodialyzer gasket 6.
a first communication hole for discharging the liquid to be treated that has been electrodialyzed in communication with a and 12a to the outside through the treatment liquid discharge portion 8a,
Reference numeral 16 denotes a communication hole or an inflow port 11b provided in the adjacent anion and cation exchange membranes 4 and 5 or the gasket 6 for electrodialyzer,
A second communication hole communicating with 12b to supply the liquid to be treated to the upper portions of the meandering flow paths 11 and 12 through the treatment liquid supply unit 7a, and 17 is provided at a predetermined position of the gasket body 10 and adjacent to the ion exchange It is a fixing hole in which a fixing support member such as a spacer for fixing the space between the membranes or between the electrode plate and the ion exchange membrane to reinforce and support the vicinity of the opening of the flow path pattern is arranged.

Communication holes are formed in the anion and cation exchange membranes 4 and 5 at the positions corresponding to the communication holes of the gasket in which the meandering flow channels 11 and 12 serving as deionization chambers are formed, and the adjacent concentrating cells are formed. It is connected to the gasket body in which the meandering flow passages 11 and 12 which become chambers are formed. It should be noted that the meandering flow path 1 is so arranged that the anion and cation exchange membranes 4 and 5 do not block the first communication hole 15 and the second communication hole 16 of the electrodialyzer gasket 6.
It may be wider than the whole of 1 and 12 and smaller than the gasket body 10.

In the electrodialyzer 1, a large number of anion-exchange membranes 4 and cation-exchange membranes 5 are alternately stacked with the gasket body 10 interposed between the cathode plate 2 and the anode plate 3 to form a gasket body 10. The flow paths for the desalting chamber and the concentrating chamber are alternately formed inside.

That is, the gasket body 10 which is turned upside down next to the cathode plate 2, the anion exchange membrane 4 next to the gasket body 10, and the front and back non-inverted gasket next to the anion exchange membrane 4. Body 10 ', this gasket body 1
Next to 0 ', a cation exchange membrane 5 is laminated, and a serpentine flow path 11 serving as a desalting chamber or a concentrating chamber for each gasket body 10,
12 are formed alternately.

Following the cation exchange membrane 5, a gasket body 10 having the front and back reversed, an anion exchange membrane 4, a gasket body 10 'having no front and back inversion, and a cation exchange membrane 5 are laminated in this order.

Finally, a cell is constructed by laminating the cation exchange membrane 5, the gasket main body 10 which is turned upside down and the anode plate 3 in this order. In addition, the anion exchange membrane 4 and the cation exchange membrane 5 are the two outlets 11a and 12a, both inlets 11b and 12b, the first communicating hole 15, the second communicating hole 16, and the fixing of the gasket body 10 which will be described later. The holes 17 are stacked so as not to close them.

The gasket body 10 is made of an elastic material such as urethane rubber having elasticity. As shown in FIGS. 1 and 2, in the gasket body 10, a first series of meandering flow paths 11 and a second series of meandering flow paths 12 are formed in parallel. . The serpentine channel 11 and the serpentine channel 12 have the same channel width, and the gasket body 1
They are separated from each other by 0 meandering partition walls 13, and each of the meandering flow paths 11 and 12 is formed so as to meander by being folded back by each rectangular partition wall 14. The first series of the meandering flow path 11 has an inflow port 1 into which the liquid to be treated flows at one end.
1b is provided, and an outlet 11a through which the liquid to be treated flows out is provided at the other end.

In the second series of meandering flow paths 12, one end portion adjacent to the inflow port 11b of the first series of meandering flow paths 11 is provided.
An inflow port 12b into which the liquid to be processed flows is provided, and an outflow port 12a from which the liquid to be processed flows out is provided at the other end adjacent to the outflow port 11a of the first series of meandering flow paths 11.

When the gasket body 10 which is turned upside down is laminated, the gasket body 10 is turned upside down so as to be adjacent to each other in a laminated state at a position where both the outlets 11a and 12a of the gasket body 10 turned upside down are located. Further, a first communication hole 15 is provided for communicating the two outlets 11a, 12a of the gasket bodies 10 with each other.

In addition, when the gasket body 10 having the front and back reversed is laminated on the gasket body 10, the front and back surfaces adjacent to each other in a laminated state are located at the positions where both the inlets 11b and 12b of the gasket body 10 are reversed. The 2nd communicating hole 16 which connects both the inflow ports 11b and 12b of the reversed gasket main bodies 10 is provided.

Further, the gasket body 10 has a meandering partition wall 13 for separating the first and second meandering flow paths 11 and 12, and
A rectangular partition wall 14 is provided for folding back and bending the first and second meandering flow paths 11, 12 themselves.

These meandering partition wall 13 and rectangular partition wall 14
Is a part of each partition wall 13 and 14 of the gasket body 10 'which is not reversed when the gasket body 10' which is not reversed and the gasket body 10 which is reversed.
A part of the partition wall of the next gasket body 10 'is adapted to match. Then, a pin or boss which is a fixed support member is inserted into the matching partition wall portion, and fixing holes 17 for fixing the meandering partition wall 13 or the rectangular partition wall 14 with the pin or boss are provided in each partition wall 13, 14 is provided.

Therefore, in the electrodialysis device 1, the partition walls 13 and 14 of the laminated gasket body 10 ′ which is not reversed and the gasket body 10 which is reversed, such as pins, which are inserted into the fixing holes 17, It is designed to be integrally fixed by a boss or the like.

Then, the gasket bodies 10 which are turned upside down and are adjacent to each other in a laminated state are sandwiched between the gasket bodies 10 and which are not turned upside down.
Both outlets 11a and 12a by the 0'first communication hole 15
Are communicated with each other, and both inflow ports 11b, 12b are communicated with each other by the second communication hole 16 of the gasket body 10 'whose front and back are not inverted.

Similarly, the front and back non-inverted gasket bodies 10 'which are adjacent to each other in a laminated state are sandwiched between the gasket bodies 10' and the gasket body 1 is turned upside down.
Both outlets 11a and 12a are communicatively connected by the first communicating hole 15 of 0, and both inlets 11b and 12b are communicatively connected by the second communicating hole 16 of the gasket body 10 which is turned upside down.

The anion-exchange membrane 4 and the cation-exchange membrane 5 are laminated, and both the outlets 11a and 12a, both inlets 11b and 12b, the first communicating hole 15 and the second communicating hole 15 of the gasket body 10 are stacked. The communication hole 16 and the fixing hole 17 are not blocked.

In this electrodialysis device 1, both the first and second meandering flow passages 11, 11
For example, when a liquid to be treated such as seawater is made to flow in 12, and the liquid to be treated such as seawater is made to flow in both meandering flow paths 11 and 12 of the gasket body 10 which is turned upside down, the gasket body 10 'of the front and back is not inverted. The liquid to be treated flowing in both meandering flow paths 11 and 12 is electrodialyzed and desalted while flowing in the meandering flow paths 11 and 12, and the desalted salt content is a gasket which is turned upside down. It is accumulated in the liquid to be treated flowing through both meandering flow paths 11 and 12 of the main body 10.

As described above, in the first embodiment,
A first meandering channel 11 and a second meandering channel 12 are formed in parallel in the gasket bodies 10 and 10 '. On the other hand, in the conventional gasket A as shown in FIG. 4, one meandering flow path B connected in series is formed. Therefore, in the first embodiment, the flow rate of the liquid to be treated individually flowing through both the meandering flow paths 11 and 12 can be reduced as compared with the conventional one having one meandering flow path B, and as a result, It is possible to reduce the pressure loss of the liquid to be treated which flows through the meandering flow paths 11 and 12 individually. In addition, the two types of the ion-exchange membranes 4 and 5 of Yin and Yang are connected to the two meandering flow paths 11 and 12.
In comparison with the conventional meandering flow path B in which the entire ion exchange membrane D is effectively used in one meandering flow path B, both meandering flow paths 11, 1 of the gasket body 10, 10 ′ are effectively used.
It is also possible to shorten the flow path length of 2.

Therefore, the flow passage widths of the meandering flow passages 11 and 12 of the gasket bodies 10 and 10 ′ are set so that the anion exchange membrane 4 and the cation exchange membrane 5 which are adjacent to each other with the gasket body 10 in between are not in contact with each other. Even when set to the road width,
It is possible to suppress an increase in the pressure loss of the liquid to be processed flowing through both the meandering flow paths 11 and 12. In addition, by narrowing the flow passage width, it is possible to eliminate the need for a contact prevention member that prevents contact between the anion exchange membrane 4 and the cation exchange membrane 5 that are adjacent to each other with the gasket bodies 10 and 10 'interposed therebetween. As a result, the manufacturing cost can be reduced.

In the first embodiment, the gasket body 10,
10 'is formed of an elastic material such as urethane rubber having elasticity. Therefore, the gasket bodies 10, 1
The gasket bodies 10 and 10 'can be adhered to the anion exchange membrane 4 and the cation exchange membrane 5 which are adjacent to each other with 0' sandwiched therebetween. It is also possible to prevent the liquid to be treated from leaking.

Further, in the gasket bodies 10 and 10 ', the meandering partition walls 13 of the meandering flow paths 11 and 12 and the respective rectangular partition walls 14 are fixed by fixing support members such as pins and bosses. Therefore, it is possible to prevent the partition walls 13 and 14 of the gasket bodies 10 and 10 ′ from moving due to the liquid to be treated flowing in the meandering flow paths 11 and 12. Therefore, it is possible to prevent the meandering partition wall 13 and the rectangular partition wall 14 from moving to block the meandering flow paths 11 and 12, or prevent the flow path width from being narrowed.

Further, the meandering flow path 1 of the gasket body 10
Even if any of the materials 1 and 12 is clogged due to adhesion of solids or the like, the liquid to be treated can be flowed using the flow path on the side not clogged, and the liquid to be treated can be supplied within a predetermined flow rate range. The operation stability of the electrodialysis device 1 is excellent, and the liquid to be treated to be flown to each of the meandering flow paths 11 and 12 of the electrodialysis device 1 is changed according to the change of the dialysis conditions such as the components and viscosity of the liquid to be treated. Since the flow rate can be adjusted, the controllability during operation of the device is excellent and the operation efficiency is excellent.

(Embodiment 2) FIG. 3 (a) is a plan view of a gasket for an electrodialyzer according to Embodiment 2 of the present invention, and FIG. 3 (b) is a sectional view taken along the line XX. .

In FIG. 3, 20 is a gasket for an electrodialyzer, 21 is a gasket main body, 22 is a core member made of a rigid material such as a metal plate or hard synthetic resin arranged on the gasket main body 21, and 23 is urethane rubber. It is a covering portion made of an elastic material such as, for covering the core material portion 22.

In the description of the second embodiment, the same components as those of the first embodiment or the first embodiment.
The same components as those of the first embodiment are designated by the same reference numerals as those of the first embodiment, and the description overlapping with the description of the first embodiment will be omitted.

The gasket body 21 of the second embodiment shown in FIG. 3 is formed of a composite material in which a core material portion 22 made of a rigid material is sandwiched by a covering portion 23 made of an elastic material.
If metal is used for the rigid material,
Meandering flow path 11, second meandering flow path 12, first communication hole 1
5. After forming the second communication hole 16, the entire rigid material is coated with an insulating elastic material to avoid an electrical short.

In the electrodialyzer gasket 6, the gasket body 10 is made of an elastic material. Therefore, the rigidity is poor, and as shown in FIGS. 1 and 2, the partition walls 13 and 14 of the gasket body 10 are provided with fixing holes 17. On the other hand, in the second embodiment, since the gasket body 21 is formed of the composite material in which the rigid material is sandwiched by the elastic materials, as shown in FIG. The fixing hole as in the form 1 is not provided.

As described above, in the second embodiment,
The gasket body 21 is formed of a composite material of a core material portion 22 made of a rigid material and a covering portion 23 made of an elastic material. Therefore, the anion exchange membrane 4 and the cation exchange membrane 5 that are adjacent to each other with the gasket body 21 interposed therebetween can be adhered to each other on the surface of the elastic material of the gasket body 21, and the two meandering flow paths 11 of the gasket body 21, Leakage of the liquid to be treated from 12 can be prevented.

Since the gasket body 21 is made of a composite material in which a rigid material is sandwiched by elastic materials,
The partition walls 13 and 14 of the gasket body 21 are changed by the liquid to be treated flowing in the meandering flow paths 11 and 12 of the gasket body 21.
The rigidity of the gasket body 21 can prevent the movement of the. Therefore, the moved partition walls 13, 1
It is possible to prevent the meandering flow paths 11 and 12 from being blocked by 4 and from narrowing the flow path width of the meandering flow paths 11 and 12.

Further, since the rigidity of the gasket body 21 is increased by using the rigid material as the core material portion 22 of the gasket body 21, the assembly of the gasket body 21 can be facilitated and the manufacturing efficiency can be improved. Further, when a metal is used as the rigid material, the thickness of the core member 22 can be reduced to reduce the thickness of the gasket body 21. Further, when synthetic resin is used as the rigid material, the weight of the gasket body 21 can be reduced.

In the first and second embodiments described above, the two serpentine flow passages 11, 21 are formed in the gasket bodies 10, 21.
12 are formed in parallel. However, in the gasket for electrodialyzer according to the present invention, at least two flow paths may be formed in parallel in the gasket body.
That is, the number of flow paths of the liquid to be treated formed in parallel is not limited to two, and may be, for example, three or four, and the shape of the flow paths is, for example, an elongated rectangular shape. It is also possible to arrange a large number of them in parallel.

[0083]

EFFECT OF THE INVENTION According to the gasket for electrodialyzer according to claim 1, the following effects can be obtained.

(1) Since a plurality of independent channels of the liquid to be treated are formed in parallel in the gasket body, the liquid to be treated flowing in each channel is different from the case where there is one channel. It is possible to reduce the pressure loss by reducing the flow rate of, and to supply the liquid to be treated to the flow path with a small amount of power, which is excellent in operability.

(2) Since a plurality of flow paths for the liquid to be treated are formed in the gasket body as independent series, the width of the flow paths can be narrowed when the total flow path cross-sectional area is constant.
The flow path is not restricted by the deformation of the gasket body or the ion exchange membrane, has excellent stability, and the electrodialysis device can be operated efficiently.

(3) Even if the ion exchange membranes disposed adjacent to the gasket body are contacted and deformed in the flow channel, or if solid matter or the like adheres to the flow channel and is clogged, it is blocked. It is possible to flow the liquid to be treated using a flow path that is not provided, to supply the liquid to be treated within a predetermined flow rate range, and it is excellent in operational stability of the electrodialysis device.

(4) It is also possible to adjust the flow rate of the liquid to be treated to be supplied to each series of electrodialyzers in accordance with changes in dialysis conditions such as components and viscosity of the liquid to be treated. Excellent in operating efficiency.

(5) Since the channel width of the channel can be narrowed, a contact prevention member for preventing the contact between the ion exchange membranes adjacent to each other with the gasket in between is unnecessary, and as a result, the manufacturing cost can be reduced. You can

The gasket body is thinly formed in a flat plate shape, and may be made of synthetic resin such as urethane rubber or metal, or a metal plate whose core and front and back surfaces are covered with synthetic resin.

The ion-exchange membrane is composed of two types of flat plate-like membranes, an anion-exchange membrane and a cation-exchange membrane, and these membranes are alternately laminated through the gasket body. To be

According to the gasket for an electrodialyzer described in claim 2, the following effects can be obtained in addition to the effect of claim 1.

(1) The gasket body can be brought into close contact with the surfaces of both ion exchange membranes that are adjacent to each other with the gasket body sandwiched therebetween, and the liquid to be treated flowing through the flow path of the gasket body can be effectively prevented from leaking.

(2) Since the elastic material has a predetermined elasticity,
The space between the ion-exchange membranes on both sides can be reliably maintained, and the flow passage cross-sectional area of the liquid to be treated formed in each gasket body can be kept constant.

According to the gasket for an electrodialysis device described in claim 3, the following effects can be obtained in addition to the effects of claim 1 or 2.

(1) It is possible to prevent the partition walls that separate the adjacent meandering portions of the respective flow paths in the gasket body from moving by the liquid to be treated flowing in the meandering flow path, and the moving partition walls prevent the meandering flow paths from moving. It is possible to prevent the flow path from being blocked or the width of the flow path being narrowed.

The fixed support member may be a fastener such as a bolt, pin or boss, or
It may be an adhesive material such as an adhesive or an adhesive tape.

According to the electrodialysis apparatus gasket of the fourth aspect, the following effect is obtained in addition to the effect of any one of the first to third aspects.

(1) The elastic material of the gasket body can be brought into close contact with both ion exchange membranes that are adjacent to each other with the gasket body sandwiched therebetween, and the sealing property for preventing the liquid to be treated from leaking from the flow path of the gasket body. Are better.

(2) The partition wall that separates the meandering portions adjacent to each other of the meandering flow paths in the gasket body from moving by the pressure of the liquid to be treated flowing in the flow paths can be prevented by the rigid material of the gasket. In addition, it is possible to prevent the meandering flow path from being blocked by the moved partition wall and from narrowing the flow path width of the meandering flow path.

(3) Since the rigidity of the gasket body is increased by the rigid material, the gasket can be easily assembled and the manufacturing efficiency can be improved.

According to the electrodialyzer gasket of claim 5, the following effect is obtained in addition to the effect of claim 4.

(1) When the rigid material is made of synthetic resin, the weight of the gasket body can be reduced, and the economy and durability are excellent.

(2) When the rigid material is made of metal, the thickness of the rigid material can be reduced, the thickness of the gasket body can be reduced, and the space between the adjacent ion-exchange membranes of Yin and Yang can be reduced. Can be set small to increase the efficiency of electrodialysis.

According to the electrodialysis device of claim 6,
The following effects can be obtained.

(1) Since a plurality of independent channels of the liquid to be treated are formed in parallel in the gasket body, the flow rate of the liquid to be treated flowing through the respective flow passages is reduced to reduce the liquid to be treated. It can be supplied to the flow path and its operability is excellent.

(2) Since a plurality of independent series of flow paths are formed in the gasket body, the width of the flow path can be narrowed when the total flow path cross-sectional area is constant, and the flow path of the gasket body and the ion exchange membrane can be reduced. It is not restricted by deformation and has excellent stability, and the electrodialysis device can be operated efficiently.

(3) Even if the ion exchange membranes disposed adjacent to the gasket body are contacted and deformed in the flow channel, or if solid substances adhere to the flow channel and are clogged, they are blocked. It is possible to flow the liquid to be treated using a flow path that is not provided, to supply the liquid to be treated within a predetermined flow rate range, and it is excellent in operational stability of the electrodialysis device.

(4) Since the flow rate of the liquid to be treated for each series of electrodialyzers can be adjusted according to the variation of the dialysis conditions such as the components and viscosity of the liquid to be treated, the control during the operation of the device is possible. Excellent in operating efficiency.

[Brief description of drawings]

FIG. 1 is an exploded view schematically showing an electrodialysis device using a gasket for an electrodialysis device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the gasket for electrodialysis device according to the first embodiment of the present invention.

FIG. 3 (a) is a plan view of a gasket for electrodialyzer according to Embodiment 2 of the present invention, and FIG. 3 (b) is a sectional view taken along line XX.

FIG. 4 is a plan view of a gasket used in a conventional electrodialysis device.

[Explanation of symbols]

1 electrodialysis machine 2 cathode plate 3 Anode plate 4 Anion exchange membrane 5 Cation exchange membrane 6 Gasket for electrodialyzer 7 Case member 7a Treatment liquid supply unit 8 case members 8a Treatment liquid discharge part 10 Gasket body 10 'gasket body 11 meandering flow path 11a Outlet 11b Inlet 12 meandering flow path 12a Outlet 12b Inlet 13 meandering partition 14 Rectangular partition 15 First communication hole 16 Second communication hole 17 fixing holes 20 Gasket for electrodialyzer 21 Gasket body 22 Heartwood 23 Cover

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J040 AA01 AA11 FA05                 4D006 GA17 HA44 HA46 HA47 HA55                       JA04A JA04C JA07A JA08A                       JA23A JA23C JA23Z JA24A                       JA24C JA24Z JA41A JA42A                       JA43A JA44A MA03 MA13                       MA14 MB07 PA01 PB02 PB26                 4D061 DA04 DB13 EA09 EB01 EB04                       EB13 EB19

Claims (6)

[Claims] 1. An ion exchange membrane of two types of Yin and Yang is alternately arranged in parallel between electrode plates formed in a flat plate shape, and the liquid to be treated is caused to flow through a channel formed between the ion exchange membranes adjacent to each other. A gasket for an electrodialysis device, which is applied to an electrodialysis device for applying a voltage between electrode plates to perform electrodialysis, wherein the peripheral portion is closely arranged between the ion exchange membranes,
A gasket for an electrodialysis device, characterized in that a flow path for a liquid to be treated, which is formed in a serpentine flow path pattern composed of a plurality of independent lines, is formed through the front and back surfaces of a gasket body. 2. The gasket for an electrodialyzer according to claim 1, wherein the gasket body is made of an elastic material having a predetermined elasticity. 3. A fixed support such as a spacer for fixing the space between the adjacent ion-exchange membranes or the space between the electrode plate and the ion-exchange membrane at an innermost position of the serpentine portion of the flow passage of the gasket body. A member is arranged, The gasket for electrodialysis machines of Claim 1 or 2 characterized by the above-mentioned. 4. The gasket body is formed of a composite material including a rigid material having rigidity and an elastic material having elasticity sandwiching the rigid material. The gasket for an electrodialysis device according to item 1. 5. The gasket for an electrodialyzer according to claim 4, wherein the rigid material is made of synthetic resin or metal. 6. An electrodialyzer gasket according to any one of claims 1 to 5, and an ion-exchange membrane that is laminated at a predetermined interval from each other via the electrodialyzer gasket. An electrodialysis device comprising: