JP2003300075A - Member for electric regenerative water purifying apparatus and electric regenerative water purifying apparatus formed by using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the mounting and the exchange of an ion exchange resin and to improve the demineralizing characteristics by the ideal arrangement of the ion exchange resin in a demineralization chamber. <P>SOLUTION: This member for an electric regenerative water purifying apparatus is a member for structuring the demineralization chamber and/or a concentration chamber used for the electric regenerative water purifying apparatus provided with the concentration chamber and the demineralization chamber by arranging an anion exchange membrane and a cation ion exchange membrane alternately between an anode chamber and a cathode chamber and having an ion exchange resin layer at least in the demineralization chamber and is constituted of (a) a frame part having an opening nearly corresponding to the effective membrane surface of the demineralization chamber or the concentration chamber, (b) a pair of sheets fixed to the frame part in both sides of the frame part and for covering an opening part, (c) the ion exchange layer housed in a space surrounded by the frame part and a pair of the sheets and (d) an ion exchange resin separator mounted to be interposed as needed in the ion exchange resin layer to house to separate the ion exchange resin constituting the ion exchange resin layer into an anion exchange resin existing zone and a cation exchange resin existing zone, and removable by decomposition or dissolution. The electric regenerative water purifying apparatus is obtained by using the member. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an anion exchange membrane and a cation exchange membrane which are alternately arranged between an anode chamber and a cathode chamber to alternately provide a concentrating chamber and a desalting chamber, and at least an ion exchanging chamber in the desalting chamber. Regarding a member for forming a desalination chamber and a member for forming a concentrating chamber used in an electric regeneration type pure water producing device containing a resin, a demineralizing chamber or a concentrating chamber at the heart of the electric regeneration type pure water producing device is constructed. The purpose is to radically improve the filling work of the ion exchange resin, and at the same time, to provide an electrically regenerated pure water production system with greatly improved desalination characteristics by ideally arranging the ion exchange resin in the desalination chamber. Is another purpose.

[0002]

2. Description of the Related Art A device for accommodating an ion exchanger in a desalting chamber of an electrodialysis device for electrically desalting has been developed and put into practical use as an electric regeneration type pure water producing device. In the conventional pure water production method, the ion exchange resin must be frequently regenerated using chemicals, but according to the electric regeneration type pure water production apparatus, high purity pure water can be continuously produced just by turning on the power. It is attracting attention as a new technology that is expected to grow, because it has the advantages that it can obtain water and does not require wastewater treatment.

The desalting chamber in which pure water is produced in the electric regeneration type pure water producing apparatus is a narrow space partitioned by a cation exchange membrane on the cathode side and an anion exchange membrane on the anode side and having a space of only a few millimeters. In general, the anion exchange resin and the cation exchange resin are mixed and accommodated in this space. Here, the ion exchange resin inserted into the desalting chamber is supplied with hydrogen ions or hydroxide ions generated mainly by the "hydrolysis" phenomenon caused by the potential difference at the interface (contact point) with a different ion exchanger, and is then in a free form. It is considered that a small amount of ions are trapped while they are regenerated, and they function as a transport path for the trapped ions to the adjacent chamber.

In order to assemble such an electric regeneration type pure water producing apparatus, it is necessary to uniformly fill the narrow space with a spherical ion-exchange resin, and then stack several layers of a desalting chamber and a concentrating chamber. There is a large difference in the sedimentation rate due to the difference in the specific gravity of the resin and the particle size distribution, and in the free form a strong cohesive force is exerted between the anion exchange resin and the cation exchange resin, which makes work more difficult than expected. For this reason, a method of injecting the ion-exchange resin into the desalination chamber using a dedicated nozzle or the like is also adopted, but it is difficult to control and confirm the injection state and it is difficult to say that dividing the desalination chamber is sufficient. . Both methods cause uneven distribution due to resin migration due to long-term use, and further decrease in water permeability due to crushing of ion exchange resin, which eventually leads to deterioration in desalination performance.

In order to solve such a problem, a method of processing the ion exchanger to be inserted into the desalting chamber into a plate shape according to the shape of the desalting chamber is used. That is, a method of molding an ion exchange resin into a sheet by using a binding polymer (Japanese Patent Application Laid-Open No. 20-1999).
00-218137) or a method of freezing the ion-exchange resin in a sheet with water (Japanese Patent Laid-Open No. 11-19498), the ion-exchange resin is processed into a sheet. The latter requires a special working environment and the assembly work at low temperature is not easy, and the history of freezing and thawing makes it easier for the ion exchange resin to be crushed for long-term use. . Although a method of using a non-woven fabric composed of ion-exchange fibers is also practiced, ion-exchange fibers are extremely expensive and have a drawback that they have high water permeability and high electric resistance.

Further, an ion exchange resin is disclosed in JP-A-2001-340864.
As can be seen in the specification, there is proposed a method of storing the water in a mesh bag that allows water to enter and leave it, but the desalination chamber of an electric regeneration type pure water producing apparatus usually has an area of several dm2 ( There are several hundred cm2), while the thickness is only 3-7 mm,
It is quite difficult to spread the bag-filled ion-exchange resin thinly and widely, but the experience of the present inventors is that it is impossible to uniformly fill the peripheral portion and the corner portion of the chamber. Close to.

As described above, in any of the methods, the ion exchange resin is filled in the desalting chamber in a disordered state far from the ideal state. As a result of pursuing the ideal arrangement of the ion exchange resin in the desalting chamber where the desalination can be ideally performed, the present inventors have found that (1) contact of different ion exchangers in the direction perpendicular to the ion exchange membrane through which current flows ( There is only one solution point,
(2) The anode side (anion exchange membrane side) from the water dissolution point is an anion exchange resin, and the cathode side (cation exchange membrane side) is a cation exchange resin. We have found that it is an efficient condition.

That is, the hydroxide ions generated under such conditions can be smoothly moved from the anion exchange resin to the anion exchange membrane by the connection of the anion exchanger, and the movement of one hydrogen ion is further expelled to these. It is considered that the movement of trapped ions derived from water is similarly easy, and the association of hydrolyzed ions is also small. As a result, desalting can be performed with the highest current efficiency and energy saving.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances from the above viewpoints, and simplifies the mounting and replacement of the ion exchange resin and the arrangement of the ion exchange resin in the desalination chamber. The purpose is to significantly improve the desalination characteristics by controlling

[0010]

According to the present invention, an anion exchange membrane and a cation exchange membrane are alternately arranged between an anode chamber and a cathode chamber to provide a concentration chamber and a desalting chamber, and at least an ion exchange chamber is provided in the desalting chamber. A demineralizing chamber and / or concentrating chamber constructing member for use in an electric regeneration type pure water producing apparatus having a resin layer, comprising:
A frame portion having an opening substantially corresponding to the effective membrane surface of the desalting chamber or the concentration chamber, (2) a sheet pair fixed to the frame portion on both sides of the frame portion and closing the opening portion, (3) a frame portion and a sheet pair An ion exchange resin layer housed in the enclosed space, and (4) an ion exchange resin which is interposed in the ion exchange resin layer and composes the ion exchange resin layer, if necessary. A member for an electric regeneration type pure water producing device characterized by comprising an ion exchange resin separator which can be decomposed or dissolved to be removed separately from an existing area and housed therein, and electricity obtained by incorporating this member. It is a regenerative type pure water production device.

The member of the present invention has a simple structure in which an ion-exchange resin is contained in a container consisting of a pair of sheets fixed on both sides of a frame. It is easy to install and replace in the device, and has the similar convenience to the audio tape cassette system, which can contribute to the rationalization of device assembly and maintenance management, and it has been separated from the device assembly. It is another object of the present invention to provide an electric regenerator-type pure water production apparatus capable of being filled with an ion exchange resin in an ideal arrangement under a preferable environment unique to another line and greatly improving desalination characteristics. It is one purpose.

The structure of the present invention will be described in more detail below. The member of the present invention uses a frame portion and a sheet pair existing by closing the opening portion of the frame portion as a container for the ion exchange resin, and the frame portion is a desalting chamber of the electric regenerator type pure water producing apparatus. The frame and / or the concentrated chamber frame (these may be abbreviated as “chamber frame” hereinafter) may be used as the frame portion, or a dedicated frame portion may be used separately from these chamber frames. As a sheet pair when the chamber frame is used as a frame portion, even a sheet that is removed from the member and is not installed in the deionized water production device (non-embedded sheet) is installed in the device together with the member (installed sheet). Sheet), or the sheet pair may be a pair of a non-embedded sheet and an incorporated sheet, but in any case, the incorporated sheet is an ion exchange membrane, Alternatively, it must be composed of a material that can be decomposed or dissolved to be removed.

FIG. 1 uses a chamber frame (1) as a frame portion,
The member of the present invention will be described in the case where a sheet pair including a non-installing sheet and an assembling sheet is used. The non-incorporating sheet (3) is unnecessary after the device is assembled, and it is preferable to use a relatively high-rigidity plastic sheet temporarily fixed to the frame with an adhesive tape or the like. On the other hand, the assembling sheet (2) is to be dissolved or decomposed in the state of being incorporated in the device, and to be removed. Alternatively, it is necessary that the dissolution residue can be sufficiently removed, and therefore, it is preferable to take care that there is no extremely deep place such as between the chamber frame and the ion exchange membrane. When an ion exchange membrane is used as the assembling sheet, the attachment to the chamber frame may be exactly the same as the non-assembling sheet (3).

When the chamber frame is not used, it is possible to use a member composed of a material in which at least one of the sheet pair can be accommodated in the desalting chamber or the concentrating chamber together with the frame portion and can be decomposed or dissolved to be removed. it can. At least one of the pair of sheets and the frame portion may be integrated.

The sheet pair used in the present invention is fixed on both sides of the frame, and contains the ion-exchange resin between them in a layered manner, and at the same time protects the contents from an external action which is received during handling. Even if it is subjected to various treatments until it is installed in the device, the contained ion exchange resin does not come out of the sheet, the sheet has strength to withstand handling, and the uneven distribution due to movement of the contained ion exchange resin. It is necessary to prevent such changes.

The non-embedded sheet is removed from the member by the time of assembling, and the incorporated sheet disappears due to the removal treatment after the apparatus is incorporated, and the ion-exchange resin and the ions forming the ion-exchange resin layer are removed. There is no obstacle between the exchange membrane and the contact between them. This is exactly the same even when the ion exchange membrane is directly used as the assembling sheet, and the fact that the ion exchange resin layer is substantially free of inclusions is a factor that realizes low electric resistance. In addition, a net-shaped fiber that withstands decomposition or dissolution treatment is mixed with the incorporation sheet and / or the ion exchange resin separator (described later),
This net can be used after the removal, but in the present invention, consideration is also added to reduce the electric resistance as much as possible.

As the non-embedded sheet, a fibrous sheet,
There is a film, or a composite sheet in which a film is laminated on a fibrous sheet or a coating film is formed, and the like, and as the fibrous sheet, there are non-woven fabrics, knitted fabrics, woven fabrics, and papers in terms of structure, and both of them are Can be used. Fibers that can be decomposed and removed include 6-nylon, 6,6-nylon, cellulose fibers, regenerated cellulose fibers, acetate or triacetate fibers, polylactic acid fibers, which can be decomposed with a strong acid such as sulfuric acid or hydrochloric acid, or an aqueous solution thereof, or Examples include protein fibers such as silk and wool that can be decomposed by an aqueous solution of a strongly basic substance such as caustic soda and caustic potash, and aliphatic polyester fibers typified by polylactic acid fibers. Further, as an example of the fiber that can be dissolved and removed, there is a polyvinyl alcohol fiber that is dissolved by hot water or hot water.

On the other hand, as the film or coating film-forming polymer which can be decomposed or dissolved, the above fiber raw materials can be used, and polycaprolactone, which is an easily decomposable polymer,
There are aliphatic polyesters such as polypropiolactone, polyglycolic acid, and polylactic acid, and various natural and synthetic water-soluble polymers such as various sizing agents derived from cellulose, polyalginic acid, gelatin, polyoxymethylene, and modified polyvinyl alcohol. Can be used.

In order to incorporate the member of the present invention into the apparatus, the member of the present invention is put between predetermined ion exchange membranes, these are sequentially laminated, and finally the attached bolts are tightened to assemble a pure water producing apparatus. However, when the ion-exchange resin has no attached water and the member of the present invention is stacked horizontally, it is possible to remove the non-embedded sheet above the uppermost member without disturbing the ion-exchange resin layer. And
After that, it is possible to assemble the entire device in the same manner by sequentially stacking the sheets while removing the non-embedded sheets. It is also possible to pull out only the non-embedded sheet by keeping the tightening light after stacking and before tightening.
By this method, even if both of the sheet pairs are non-embedded sheets, they can be removed.

In the present invention, by using an ion exchange resin separator composed of a material that can be decomposed or dissolved and removed, similar to the above-mentioned sheet for incorporation, the distribution of the ion exchange resin in the ion exchange resin layer can be improved. , Can be in an ideal state. There are three major conditions, each of which has its own characteristics.

First, as shown in FIG. 2 (A), the ion-exchange resin separator comprises an ion-exchange resin constituting the ion-exchange resin layer, an anion-exchange resin existing region on the anion-exchange membrane side and a cation-exchange membrane. This is a case where the cation-exchange resin is stored in two separate areas on the side. As the ion exchange resin separator in this case, a flat film may be used, but it is more preferable that there is moderate unevenness because it has the effect of suppressing the movement of the ion exchange resin when handling the member, and it is thinner and softer than rigid. Is preferable because it does not create unnecessary space at the boundary.

In this case, as shown in FIG. 2B, the ion exchange resin separator separating the ion exchange resin layer or the main part thereof disappears due to the disassembling process or the dissolving process after the device is assembled, and the boundary surface before disappearing. Although it may change slightly depending on the unevenness of the ion-exchange resin separator, the average of the anion-exchange resin on the side of the membrane and the presence of the cation-exchange membrane on the side of the cation-exchange membrane exist on the average between the membranes. A contact surface (hydrolysis surface) with the area appears. After the removal treatment of the sheet and the ion-exchange resin separator, the ion-exchange resin is kept in a wet state and swells to fill the occupied voids of the removed sheet and separator.

The ion-exchange resin separator in the first case may be made of a material that is decomposed or dissolved to remove the ion-exchange resin leaving a net through which the ion-exchange resin can freely pass. Here, "materials that can be decomposed or dissolved while leaving a net" is a composite sheet with a fibrous material with a large opening that can withstand decomposition or dissolution treatment (described above as a sheet for incorporation), and the remaining nets are narrow ions. Since it is located almost in the center of the exchange resin layer, it has the advantage of preventing the movement of the ion exchange resin and stabilizing the boundary of the existing region. On the other hand, since the opening is large, the increase in electrical resistance can be suppressed within a range that does not pose a problem.

Second, as shown in FIG. 3 (A), the ion-exchange resin separator is in the form of a sheet having irregularities, and the convex portions and the concave portions contact the sheet pair, and in some cases do not contact the sheet. Has a part, with the front and back of the sheet as a boundary,
The ion-exchange resin constituting the ion-exchange resin layer is a case where the anion-exchange resin present area on the anion-exchange membrane side and the cation-exchange resin present area on the cation-exchange membrane side are separately housed. In this case, the ion-exchange resin separator As the sheet, a sheet obtained by embossing a thermoplastic film to have irregularities in an arbitrary pattern or directional irregularities like a corrugated plate can be used.

Thirdly, an ion exchange resin separator is
A honeycomb structure having a cell group perpendicular to the sheet pair, the ion exchange resin constituting the ion exchange resin layer,
This is a case where the anion exchange resin-existing region and the cation exchange resin-existing region are divided into cell units and accommodated alternately. In this case, the ion-exchange resin separator is a plate-shaped honeycomb structure having a directionality in the inter-membrane direction, and a frame in which the sheet is fixed only on one side, the ion-exchange resin separator is stored with the sheet at the bottom, and each honeycomb The anion exchange resin and the cation exchange resin are alternately stored in the compartments, and the remaining sheets are finally fixed to complete the member of the present invention.

Further, in the third case, the ion exchange resin separator may be made of a material which is decomposed or dissolved leaving an open mesh through which the ion exchange resin cannot pass. The net left behind stops the movement of the ion-exchange resin, and it is possible to almost completely avoid the disturbance of the ion-exchange resin existence region, and the ion-exchange resin existence regions are finely mixed together to achieve a high desalination chamber. Can be realized. Thus, in this case where a wide deionization chamber is possible, the significance of ensuring a narrow and stable ion-exchange resin existence region is extremely important.

It is effective for the water to be treated to pass through a large number of different ion-exchange resin regions alternately and in order to increase the purity of the water. Therefore, the division pattern viewed from the sheet surface is long. Band-shaped or relatively short rectangular or elliptical shape, where each existing region is staggered adjacent to each other, or the opposite ionic ion-exchange resin existing region in the wide existing region (sea) of either one of them There is a pattern in which is dispersed in an island shape, but in any case, it is preferable that the length direction is substantially orthogonal to the water flow.

Regarding the width of the deionization chamber (distance between the membranes) determined by the thickness of the frame constituting the member of the present invention, when an ion exchange resin separator is not used, general electric regeneration pure water production is performed. It is 2 to 7 mm, which is almost the same as the device, and in the first case where an ion exchange resin separator is used, the desalination efficiency decreases when the intermembrane distance becomes wider than 8 mm.
Although a substantially equivalent range of 2 to 8 mm is preferable, in the second and third cases, even if the space between the membranes is widened, the desalination efficiency is not lowered so much and the chamber width can be widened, and 5 to 500 mm is preferable. In other words, the second and third cases are suitable for a relatively small machine having a large number of large deionization chambers, a low inter-electrode voltage and excellent cost performance.

The internal structure of the ion exchange resin usable in the present invention may be any of gel type, porous type, high porous type and the like, but the particle size thereof is preferably 0.1 to 1.5 mm. More preferably 0.15-0.7 mm
It should be the size of. If the particle size of this ion-exchangeable ion-exchange resinous material is smaller than 0.1 mm, the water permeability is deteriorated. On the contrary, if it is larger than 1.5 mm, the ion-exchanged resin is liable to crack, and the performance is constant over a long period of time. May not be exhibited. These ion-exchange resins may be in a salt form or a free form, but in principle, they are dry or can be handled in a free-flowing state as in the dry state, under a lightly water-containing state. It is incorporated into the member of the present invention.

In the component of the present invention, it is possible to prevent uneven distribution of the ion-exchange resin constituting the ion-exchange resin layer and to define the thickness dimension of the resin layer, and to connect the sheet pair via the ion-exchange resin layer. A connecting means can be provided that can be decomposed or dissolved and removed. The connecting means for connecting the sheets is also not particularly limited, but there is, for example, a sewing method, and as an alternative to the sewing, an adhesive or a filler is spotted across the fiber layers. Examples of the method include a method of injecting into a solid solution and then solidifying, and a method of thermally adhering with a heat-melting substance intervening in spots. When an adhesive, a filler, or a heat-melting substance that is injected or intervened in spots is used as the connecting means, the spot-connecting positions are widely distributed over the entire sheet and the intermediate ion-exchange resin is used. It is desirable to design the layers to be constrained on average.

By connecting the sheets to each other, the member of the present invention obtains preferable characteristics, which can be said to be a skeleton having both dimensional stability, proper flexibility and rigidity, from the sheet pair and the ion-exchange resin separator, and at the same time, the sheets are simultaneously formed. There is an advantage that the interval is regulated, the movement of the ion exchange resin is suppressed, the reliability of the entire member is increased, the trouble during handling is reduced, and it is possible to cope with a large-scale apparatus having a wider membrane area.

In order to remove the assembling sheet, the ion exchange resin separator and the connecting material, the decomposer or the solvent is circulated while the apparatus is assembled, and the tightening between the frame material and the ion exchange membrane is loosened. And, if necessary, renewing the decomposing agent or solvent, completely dissolving or decomposing, washing with a prescribed washing liquid, and then washing with pure water, and if necessary, repeating the necessary steps, and finally deionized water. The ion exchanger in the desalting chamber is adjusted to a free type under the manufacturing conditions.

The member of the present invention has been described above. The above member or the sheet for non-incorporation is removed from the member to assemble the device, and the electricity is obtained by disassembling and removing the sheet or the like after the device is assembled. A regenerated type pure water producing apparatus is also included in the present invention. The electric regenerator-type pure water production system of the present invention controls the ion exchange resin in the desalination chamber, which is the essential part of pure water production, in a rational arrangement that has never existed before, with ideal current efficiency and low energy consumption. So,
This is to improve the basic condition for an electrically regenerated pure water producing device that can perform extremely high levels of desalination, and it also allows greater flexibility in making the device larger, more efficient, and simpler.

The ion exchange membranes used in the present invention are homogeneous membranes, heterogeneous membranes; hydrocarbon membranes, fluorocarbon membranes; membranes with fiber reinforcement, membranes without reinforcement, etc. The ion exchange membrane used in
Can be used in principle. The ion exchange membrane and the ion exchange resin are a cation exchanger having a sulfonic acid group as an exchange group and an anion exchanger having a quaternary ammonium group as an exchange group. Particularly, in the case of an anion exchanger, a dimethylethanolamine group is used. It is preferable to use a so-called type II strong basic anion exchanger alone, or a mixture with a type I anion exchanger, which has the effect of lowering the hydrolytic potential. The present invention will be described below with reference to examples.

The following tests are carried out in the experimental electrodialyzer ME-
O type (manufactured by AMP IONEX Co., Ltd.) is used, and the desalination chamber frame and the concentration chamber frame of this testing machine have a thickness of 0.
It has an area of 85 mm and an effective area of 50 cm 2, and an oblique net is fixed to the chamber frame. The following tests were carried out in a configuration in which one demineralization chamber was provided, and concentrating chambers were arranged on both sides and electrode chambers were arranged on both outsides. For the desalination chamber, the tests were conducted with the following innovations. Ion exchange membranes are cation exchange membrane CMV and anion exchange membrane AM manufactured by Asahi Glass Co., Ltd.
V is used, and the ion exchange resin is a strongly acidic cation exchange resin commercially available as a uniform particle size type (manufactured by Dow Chemical Co., trade name: Monosphere 650C, average particle size 6).
50 μm) and a strongly basic anion exchange resin (manufactured by Dow Chemical Co., trade name: Monosphere 550A, average particle size 59)
0 μm) was preliminarily made Na type and Cl type and naturally dried.

[0036]

Example 1 A polyethylene deionization chamber chamber frame having a thickness of 5.1 mm was prepared by using 320 denier polyolefin-based heat-bonding filaments, which were fixed by thermocompression bonding to the frame part, and the fiber intersections were heated with 160 ° C. hot air. By fusing, the opening is 1
A demineralization chamber chamber frame with a 0 mm square net fixed on one side,
A partially saponified polyvinyl alcohol film with a warm water solubility for closing the opening of the chamber frame on this net surface (thickness 0.1 m
m), and an anion exchange resin layer on the anion exchange membrane side of the desalting chamber frame, a cation exchange resin layer on the cation exchange membrane side, and a polyvinyl alcohol film as a separator for preventing mixing between the ion exchange resin layers in the center. And arrange
The remaining surface of the chamber frame was temporarily fixed with a polyester film as a non-incorporating sheet with an adhesive tape to complete the member of the present invention. By removing the polyester film from the member on the upper side and incorporating the member as a desalting chamber, a demineralizing chamber is provided in the center, two concentrating chambers are provided outside the chamber, and two chambers are provided outside the demineralizing chamber. A device having the following structure was assembled. After water is supplied from the outside with the tightening between the chambers of this device being loosened to swell the ion exchange membrane and the ion exchange resin, the tightening is performed completely, and the desalination chamber is heated to 50 ° C.
2) The desalting chamber is shown in FIG. 2 (B) by circulating and circulating hot water to remove the polyvinyl alcohol film as a built-in sheet and a separator, and then performing sufficient hot water washing.
And the state. This is device A.

[0037]

[Example 2] A polylactic acid sheet having a thickness of 100 µm was first formed in a row of needle holes arranged in a straight line by a sewing machine alternately at intervals of 4.0 mm and 12.5 mm, and along this needle hole row. A corrugated sheet was formed by bending and repeating trapezoidal irregularities having a short side of 4.0 mm, a slanted surface of 12.5 mm, and a height of 8.2 mm in a right-angled cut surface. The corrugated sheet was housed as an ion-exchange resin separator inside a deionization chamber frame having a thickness of 8.5 mm, and the chamber frame was placed on a horizontal plane, and anion-exchange resin was scraped into all recesses on the upper surface. , A polyester film having the same size as the chamber frame was stacked on the above as a non-embedded sheet and fixed to the chamber frame with an adhesive tape. Next, the top and bottom were turned upside down, and a cation exchange resin was put into the recessed portion, which was scraped out, and a polyester film was fixed onto the recessed portion with an adhesive tape to complete the member of the present invention. There was almost no movement of the ion-exchange resin inside even if it was stacked as a plate-shaped member or slanted, and there was no problem in storage as a member and normal handling. After stacking this on the anode chamber side during assembly of the device, on the frame of the concentrating chamber where the anion exchange membrane has already been placed on top, first remove the polyester film at the bottom of the member, then also remove the upper film, and instead By stacking cation exchange membranes and then sequentially stacking the cathode-side concentrating chamber and the cathode chamber according to the usual method, finally, a demineralizing chamber is provided in the center, a concentrating chamber is provided on both sides thereof, and electrode chambers are provided on both outer sides. did. Water was supplied from the outside to the device with the tightening metal fittings slightly loosened to swell the ion exchange membrane and the ion exchange resin inside, and then the tightening was completed. Next, a 10 wt% sodium hydroxide aqueous solution was used as a decomposing agent for the polylactic acid sheet in the desalting chamber, and after circulating at 35 ° C. for 3 hours, washing with water and neutralization with 1N sulfuric acid,
After that, the operation of washing with water is repeated to decompose and remove polylactic acid, and the anion exchange resin and the cation exchange resin in the desalting chamber are separated into the state shown in FIG. An apparatus having a function of producing regenerated pure water was obtained. This is device B.

[0038]

Example 3 A composite sheet obtained by impregnating a cloth called “gauze” made of polyester fibers with an extremely thin mesh and a solvent solution of polylactic acid was used, and the cross section was 1 cm.
A honeycomb structure having square chambers with square corners was obtained. The cation exchange membrane is fixed to the chamber frame with adhesive tape to close one side of the special desalination chamber frame whose chamber frame width (distance between membranes) is expanded to 100 mm, so that the cross section of the honeycomb comes inside the ion exchange membrane surface. Then, the above honeycomb structure was put in, then the anion exchange resin or the cation exchange resin was put alternately in each small chamber, and finally the anion exchange membrane was fixed to the chamber frame with the adhesive tape to complete the member of the present invention. Next, this member was used as it was as a central demineralization chamber, and the same chamber constitution as in the previous example was used, and the same polylactic acid was decomposed and removed as in the previous example to obtain the device C of the present invention. FIG. 4 is a view of the inside of the demineralization chamber of the apparatus C as seen from the direction of the membrane surface, and shows a state in which the anion exchange resin and the cation exchange resin exist in a staggered pattern in their respective regions of presence. These existing regions connect the wide (long) membranes as large as 100 mm perpendicular to the ion exchange membrane surface, but are extremely stably accommodated by the intervening net.

[0039]

[Reference Example] An apparatus having the same configuration as the apparatus C, in which the free type anion exchange resin and the cation exchange resin were mixed in pure water in equal volume ratios and adsorbed to each other into an agglomerated state. The exchange resin mixture was filled.

[0040]

[Confirmation of desalination performance of the device] In all of the devices, the conductivity of the deionized water was adjusted with sodium chloride in the desalting chamber while maintaining the conductivity of the electrode chamber and the concentrating chamber at 100 μS / cm.
Water of μS / cm was supplied as an untreated water at an ascending flow rate of SV20, and when this was continued for 30 days, the specific resistance of the resulting treated water and the potential difference applied to the desalting chamber were measured. I got the result.

[0041]

[Table 1]

[0042]

As described above, the member of the present invention has a simple structure in which the ion exchange resin is stored in the container consisting of a pair of sheets fixed on both sides of the frame, and it is easy to handle and electric. It is easy to install or replace in a reclaimed pure water production system, and it has the convenience similar to the audio tape cassette system, which can contribute to the rationalization of device assembly and replacement. The ion-exchange resin can be filled in an ideal arrangement under a separate environment, which is unique to a separate line, and the electric regeneration type pure water production system of the present invention incorporating this has improved desalination characteristics from the bottom. It becomes a thing.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a configuration of a member of the present invention.

FIG. 2A is an explanatory view of a member of the present invention. (B) An explanatory view showing the distribution state of the ion exchange resin in the desalination chamber of the device of the present invention.

FIG. 3A is an explanatory view of a member of the present invention. (B) An explanatory view showing the distribution state of the ion exchange resin in the desalination chamber of the device of the present invention.

FIG. 4 is an explanatory view showing the distribution of ion exchange resin in the desalination chamber of the device of the present invention.

[Explanation of symbols]

1 room frame 2 built-in sheet 3 Non-embedded sheet (or ion exchange membrane) SP sheet pair AER anion exchange resin CER cation exchange resin AEM anion exchange membrane CEM cation exchange membrane AERA Anion exchange resin existence area CERA cation exchange resin existence area IERS Ion exchange resin separator NET net

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Claims (11)

[Claims] 1. An electric regeneration pure net having an anion exchange membrane and a cation exchange membrane alternately arranged between an anode chamber and a cathode chamber to provide a concentrating chamber and a desalting chamber, and at least an ion exchange resin layer in the desalting chamber. A member for constructing a desalting chamber and / or a concentrating chamber used in a water producing device, comprising: (1) a frame portion having an opening substantially corresponding to an effective membrane surface of the desalting chamber or the concentrating chamber; A pair of sheets fixed to the frame part on both sides and closing the opening,
(3) An ion-exchange resin layer housed in a space surrounded by the frame portion and the sheet pair, and (4) an ion-exchange resin layer which is optionally interposed in the ion-exchange resin layer and constitutes the ion-exchange resin layer. A member for an electric regeneration type pure water producing apparatus, characterized by comprising an ion exchange resin separator which is housed separately in an anion exchange resin existing region and a cation exchange resin existing region and which can be decomposed or dissolved and removed. 2. The member according to claim 1, wherein the frame portion is a desalination chamber frame and / or a concentration chamber frame. 3. A pair of sheets comprises a sheet which is removed from a member and is not incorporated into a pure water production apparatus (non-embedded sheet) and / or a sheet which is incorporated into the apparatus together with a member (embedded sheet), of which For embedded sheets,
The member according to claim 2, wherein the member is an ion exchange membrane or is made of a material that can be decomposed or dissolved to be removed. 4. At least one of the pair of sheets together with the frame portion,
The member according to claim 1, which is made of a material that can be housed in a desalting chamber or a concentrating chamber and can be decomposed or dissolved to be removed. 5. An ion exchange resin separator divides an ion exchange resin constituting an ion exchange resin layer into an anion exchange resin present region on the anion exchange membrane side and a cation exchange resin present region on the cation exchange membrane side. The member according to claim 1, which has a thickness of 2 to 8 mm. 6. The member according to claim 5, wherein the ion-exchange resin separator is made of a material that is decomposed or dissolved to leave a net through which the ion-exchange resin can freely pass. 7. The ion-exchange resin separator is a sheet having irregularities, and has an intermediate portion that comes into contact with the sheet pair at the convex portion and the concave portion and does not come into contact with the sheet in some cases. The ion exchange resin constituting the ion exchange resin layer is separately accommodated in the anion exchange resin existing region on the anion exchange membrane side and the cation exchange resin existing region on the cation exchange membrane side, and the member thickness is 3 to 500 mm. The member according to claim 1, wherein 8. An ion-exchange resin separator is a honeycomb structure having a cell group perpendicular to a sheet pair, and the ion-exchange resin constituting the ion-exchange resin layer comprises an anion-exchange resin existing region and a cation-exchange resin existing region. 2. The member according to claim 1, wherein the member is divided into cells and accommodated alternately, and the member has a thickness of 3 to 500 mm. 9. The member according to claim 8, wherein the ion-exchange resin separator is made of a material that is decomposed or dissolved leaving an open mesh through which the ion-exchange resin cannot pass. 10. An ion exchange resin constituting an ion exchange resin layer is prevented from being unevenly distributed, and a thickness dimension of the resin layer is defined, a pair of sheets is connected through the ion exchange resin layer, disassembled or dissolved. 2. The member according to claim 1, further comprising a connecting means made of a material that can be removed by a method. 11. An electric regeneration obtained by assembling a device using the above member or the member from which the non-embedded sheet has been removed, and then subjecting the sheet or the like to disassembly and removal treatment or dissolution removal treatment if necessary after assembly of the device. Type pure water production equipment.