JP3532032B2 - Electric deionized water production equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to various industries such as semiconductor manufacturing industry, pharmaceutical industry and food industry using deionized water,
Alternatively, the present invention relates to an electric deionized water production device used in power plants (condensate treatment, makeup water treatment, etc.), laboratories and the like.

[0002]

2. Description of the Related Art As an apparatus for producing deionized water, a deionized water producing apparatus for deionizing water to be treated through an ion exchange resin has been known for a long time. Since the exchange capacity of the ion exchange resin becomes saturated as the water flow rate increases, there is a handling complexity that it is necessary to regenerate the saturated ion exchange resin with a regenerating chemical solution such as an acid or alkali aqueous solution. It was

In recent years, an electric deionized water producing apparatus that does not require any regeneration treatment with a chemical has been put into practical use, and an example thereof is shown in FIGS. 11 and 12. FIG. 11 is a sectional view showing an outline of a conventional electric deionized water producing apparatus, and FIG. 12 is an exploded perspective view thereof.

In the electric deionized water producing apparatus shown in the figure, a cation exchange membrane 32a and an anion exchange membrane 32b are adhered to both sides of a frame 31, respectively, and an ion exchange resin (cation exchange resin and anion exchange resin) is provided in the internal space. A plurality of deionization modules 30 filled with ion exchange resin) 33 are arranged side by side via rubber packing 34 attached around the deionization module 30, and both ends thereof are connected to the anode 35 via the rubber packing 34. The cathode 36 is arranged and pressed by pressing plates 37, 37 while clamping them from both ends, and the space between the deionization modules and between the deionization module and the electrodes 35, 36 is concentrated. Chamber 38
Is configured as.

In such an apparatus, a direct current is passed between the anode 35 and the cathode 36, and the water to be treated is passed through the inflow line 39 for the treated water into the desalting chamber formed by the deionization module 30. By flowing the concentrated water through the concentrated water inflow line 40 into the concentrating chamber 38, the water to be treated flowing into the desalting chamber flows down the packed bed of the ion exchange resin. Impurity ions in the treated water are removed to become deionized water, which flows out through the deionized water outflow line 41.

On the other hand, when the concentrated water passed through the concentrating chamber 38 flows down through the concentrating chamber 38, it receives the impurity ions moving through the ion exchange membrane 32 and concentrates the impurity ions. Is discharged from the concentrated water outflow line 42.

According to the electric deionized water producing apparatus which electrically removes the impurity ions in the water to be treated by the above-mentioned operation, the impurity ions removed from the water to be treated flow out to the outside of the apparatus at any time together with the concentrated water. Therefore, deionized water can be continuously produced without subjecting the ion-exchange resin filled in the deionization chamber to a regeneration treatment.

[0008]

However, in the apparatus as described above, when water to be treated and concentrated water are passed through the desalting chamber and the concentrating chamber, respectively, pressure is applied to the inside of the module, and Each time the stop is repeated, arrow a shown in FIG.
Directional force (however, depending on the location of the module, the opposite direction)
Is added to the ion exchange membrane 32 that separates the deionization chamber and the concentration chamber, and the ion exchange membrane is pulled and deformed. As a result, the adhesion between the ion exchange membrane 32 and the frame body 31 is removed. The force acting in the direction of the arrow (direction of arrow b) acts, and in extreme cases, the adhesive peels off, or the ion exchange membrane in the vicinity of the adhesive remains and the deionized water leaks. Or the concentrated water is mixed in the deionized water, which may impair the deionization performance.

In particular, in a conventional electric deionized water producing apparatus in which an ion exchange membrane is bonded to a flat frame body in a flat plate shape, the force obtained by multiplying the effective area of the ion exchange membrane by the water flow pressure is kept as it is. Since it becomes a force applied to the plate 37, the ion exchange membrane arranged inside is largely deformed, and the above-mentioned problem becomes remarkable, so that the area of the ion exchange membrane cannot be increased and the processing capacity of the apparatus can be improved. There was a limit. Also,
In order to suppress the deformation of the ion exchange membrane, the pressing plate 37 is generally made to have a robust structure, but as a result, the manufacturing cost of the device and the cost at the time of loading and installing are increased, and the device may be enlarged. was difficult.

Further, the deionization module 30 and the concentration chamber 3
In order to fabricate the alternating array with the deionization module 8, the deionization modules 30 are stacked in multiple layers via the rubber packing 34, and the deionization modules 30 are fastened using the fastening means. If the number is large, it may not be possible to tighten them evenly, which may lead to imperfect sealing, which naturally limits the number of deionization modules that can be assembled.
Increasing the number of deionization modules assembled requires a high voltage to flow the constant current necessary for good deionization processing, making stable processing difficult and increasing the cost of the power supply section. There was a problem of inviting. Further, the work of assembling the deionization module 30 by adhering the ion exchange membrane to the frame 31 in a state where the ion exchange resin 33 in a wet state is uniformly filled in the frame 31 is extremely troublesome and difficult, and the work efficiency is poor. It was a thing.

The present invention has been made in view of the above points,
It is an object of the present invention to provide an electric deionized water production apparatus which does not have a risk of deionized water leaking or impairing deionization performance, and which can enhance the processing capacity of the apparatus and which is easy to manufacture. To do.

[0012]

According to the present invention, (1) a plurality of frame bodies having different diameters supporting a cation exchange membrane or an anion exchange membrane are arranged concentrically, and the outer periphery of the outer frame body is arranged. When,
Electrodes are arranged on the inner periphery of the inner frame body, and the space formed between the frame bodies is divided into a desalting chamber and a concentrating chamber, and the outermost partition and the innermost partition are located. The deionization chamber is filled with an ion exchanger, and the deionization chamber is filled with an ion exchanger.
(2) A cation exchange membrane or an anion exchange membrane is supported on each of a plurality of frame bodies formed in a tubular shape and having different diameters, and the frame body and a tubular shape formed with a diameter larger than these frame bodies. An outer electrode composed of an electrode plate of, and a counter electrode of the outer electrode,
A central electrode composed of a cylindrical electrode plate or electrode rod formed with a smaller diameter than the frame body, a frame body concentric with the center electrode as a center, and a cation exchange membrane-supported frame body and anions. At least three or more compartments are formed between the outer electrode and the center electrode by arranging the frame bodies supporting the exchange membrane in an alternating manner, and the innermost compartment and the most compartment among these compartments. Every other one of the above compartments is configured as a concentrating chamber so that the compartment located outside is configured as a concentrating chamber, and the cation exchanger and the anion exchanger are provided in the other compartments sandwiched between the concentrating chambers. An electric deionized water producing apparatus characterized by being filled and configured as a deionization chamber, (3) A frame body is constituted by an inner frame and an outer frame having ribs arranged in a grid pattern. , With an ion exchange membrane sandwiched between the inner and outer frames (1) or (2) electric deionized water production apparatus, (4) a plurality of frame, the outer electrode and the center electrode are arranged concentrically, and these are supported and fixed by a pair of upper and lower fixing members The desalting chamber and the concentrating chamber are formed, and the treated water inlet and the concentrated water inlet are provided on one fixing member, and the treated water outlet and the concentrated water outlet are provided on the other fixing member (2) or ( A ring-shaped groove is provided in one fixing member along the upper surface of each of the electric deionized water producing apparatus described in 3), (5) the desalting chamber and the concentrating chamber, and each of the demineralizing chamber and the concentrating chamber is provided. A ring-shaped groove is provided on the other fixing member along the lower surface, and the groove is communicated with the treated water inlet, the concentrated water inlet or the treated water outlet, and the concentrated water outlet. Deionized water production equipment, (6) multiple frames, outer electrodes and The center electrodes are arranged concentrically, and these are supported and fixed by a pair of upper and lower fixing members to form a desalting chamber and a concentrating chamber, and a filter is interposed at the boundary between the fixing member and the desalting chamber. The electric deionized water producing apparatus according to the above (2), (3), (4) or (5) is as a gist.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings. 1, 2, and 6 are a longitudinal sectional view, a plan view, and an exploded perspective view showing an example of the device of the present invention. Further, each of FIGS. 3 to 5 corresponds to III-II of FIG.
It is a plane sectional view in the I line, the IV-IV line, and the VV line.

In one example of the device 1 of the present invention shown in the figure,
Two frame bodies 2a, 2b formed in a tubular shape and having different diameters, a tubular electrode plate 7 (outer electrode) formed with a diameter larger than these frame bodies 2a, 2b, and the electrode plate 7 The electrode rod 6 (center electrode) serving as a counter electrode is held by a pair of upper and lower fixing members 10b and 10a having a shape similar to that of cylindrical members having different diameters stacked in a stepwise manner. The structure body in which the frame bodies 2a and 2b, the electrode plate 7, and the electrode rod 6 are held and fixed by the pair of upper and lower fixing members 10b and 10a is housed in the casing 9 via the insulating member 8 in a hermetically sealed state. .

The electrode rod 6 has one end inserted into a hole 6a formed in the center of the fixing member 10a, and the other end inserted into a hole 6b formed in the center of the fixing member 10b. , So as to project from the upper surface of the fixing member 10b. Instead of the electrode rod 6, the frame bodies 2a, 2
A cylindrical electrode plate (that is, a pipe-shaped electrode plate) formed with a diameter smaller than b may be used.

The inner surfaces of the cylindrical frame bodies 2a and 2b and the cylindrical electrode plate 7 near the respective ends are fixed.
It is held so as to be in close contact with the side surfaces of the cylindrical portions a and 10b. That is, the upper and lower end portions of the frame bodies 2a and 2b and the electrode plate 7 are respectively the step portions A of the fixing members 10b and 10a.
It is fitted and fixed to B and C. A projecting piece 7a is formed on a part of the upper end of the electrode plate 7, and the projecting piece 7a is fixed to the fixing member 10.
It is inserted into a hole 7b formed in the fixing member 10b so as to project from the upper surface of b.

The frame bodies 2a, 2b held by the fixing members 10a, 10b as described above, the electrode plate 7, and the electrode rod 6 are arranged concentrically around the electrode rod 6. Then, the ion exchange membranes 3a, 3a,
3b is supported, and between the electrode rod 6 and the electrode plate 7, there are three sections a partitioned by the frames 2a and 2b.
b and c are formed.

In the illustrated example of the device 1 of the present invention, among the compartments a, b, and c, compartments a and c are configured as concentrating chambers 5a and 5b, and in compartment b, a cation exchanger and anion exchange are provided. The body is filled with the demineralization chamber 4a.

The fixed member 10a has a treated water inlet 11a.
Is provided, and a flow path 13a communicating with the treated water inlet 11a is provided in a penetrating manner, and the flow passage 13a opens at the lower surface of the desalination chamber 4a to form a treated water inlet.

The fixed member 10a has a concentrated water inlet 1
2a is provided, and branched flow paths 23a and 23b communicating with the concentrated water inlet 12a are provided in a penetrating manner. The flow path 23a is on the lower surface of the concentration chamber 5a, and the flow path 23b is on the lower surface of the concentration chamber 5b. Each opens to form a concentrated water inlet.

On the other hand, the fixed member 10b is provided with a treated water (demineralized water) outlet 11b, and a flow passage 13b communicating with the treated water outlet 11b is provided in a penetrating manner.
The flow path 13b opens on the upper surface of the desalination chamber 4a and forms an outlet for water to be treated.

Further, the concentrated water outlet 1 is provided on the fixing member 10b.
2b is provided, and branched flow paths 23c and 23d communicating with the concentrated water outlet 12b are provided in a penetrating manner. The flow path 23c is on the upper surface of the concentrating chamber 5a, and the flow path 23d is on the upper surface of the concentrating chamber 5b. Each is open to form a concentrated water outlet.

In the present invention, felt-like ion-exchange fibers or granular ion-exchange resins are preferably used as the cation exchanger and the anion-exchanger packed in the desalting chamber 4a, and the ion-exchanger is desalted. It is preferable that the space is completely filled so that the entire space in the chamber 4a is filled.

In this way, the ion exchanger and the desalting chamber 4
There is an advantage that a space is not generated between a and the electric resistance can be reduced. In addition, the concentration chambers 5a, 5b have
to reduce the electrical resistance in b to improve the efficiency of deionization,
If necessary, a conductive material such as an ion exchanger or activated carbon is filled to reduce the power cost.

Further, when an electric current is passed between the electrode rod 6 and the electrode plate 7, which one is the anode or the cathode is arbitrary. For example, the electrode rod 6 is the anode and the electrode plate 7 is the cathode. In some cases, an anion exchange membrane is used as the ion exchange membrane 3a supported on the frame 2a on the side of the electrode rod 6, and anion contained in the water to be treated as an impurity is selected from the desalting chamber 4a to the concentrating chamber 5a. A cation exchange membrane is used as the ion exchange membrane 3b supported on the frame 2b on the side of the electrode plate 7, and a deionization chamber for cations contained as impurities in the water to be treated is used. It is possible to selectively move from 4a to the concentrating chamber 5b.

When the electrode rod 6 is used as the cathode and the electrode plate 7 is used as the anode, contrary to the above, a frame supporting a cation exchange membrane is arranged on the electrode rod 6 side, and the electrode plate 7 side is provided with a negative electrode. A frame supporting the ion exchange membrane is arranged.

Here, the ion exchange membranes 3a and 3b are attached to the frame body 2.
When the frame bodies 2a and 2b are supported by a and 2b, the specific form thereof is not particularly limited as long as it can support the ion exchange membranes 3a and 3b in a cylindrical shape without blocking movement of impurity ions. For example, as shown in FIG. 7, the frame body 2 is composed of the inner frame 21 and the outer frame 22 having the ribs 24 arranged in a grid pattern, and the ion exchange membrane 3 is provided between the inner frame 21 and the outer frame 22. As an example thereof, it can be sandwiched and the ion exchange membrane 3 is joined between the inner frame 21 and the outer frame 22 to support it.

The frame body 2 constructed in this way is peeled off or the like as compared with the case where the ion exchange membrane is supported on the single frame body (for example, the inner frame 21 or the outer frame 22 in FIG. 7) by a method such as adhesion. This is preferable because the problem 2) is less likely to occur and the ion exchange membrane 3 can be reliably supported by the frame body 2.

In the above case, the ion exchange membrane 3 sandwiched between the inner frame 21 and the outer frame 22 is formed into a single strip as shown in FIG. 7 (a), which is wound around the inner frame 21. Outer frame 2
It may be sandwiched between the two.

Further, as shown in FIG. 3B, a plurality of strip-shaped ion exchange membranes 3, 3, 3 and 3 are attached to the inner frame 21 so as to be sandwiched between them and the outer frame 22. Alternatively, a cylindrical ion exchange membrane 3 may be used as shown in FIG. Adhesion with an adhesive is usually adopted as a joining means for the ion exchange membrane 3, but other known joining methods, such as adhesion with a double-sided tape, may be used.

Incidentally, as shown in FIG. 7A or 7B, when the ion-exchange membrane is formed in the shape of a single strip or a plurality of strips and attached to the inner frame 21 and the outer frame 22, It is advisable to bond the ends of the ion-exchange membrane to each other at the cross section of the frame. Further, the outer frame 22 may be halved as shown in the drawing in order to facilitate the bonding process.

In the above structure, the water to be treated is fixed to the fixing member 1.
0a from the treated water inlet 11a through the flow path 13a to the desalination chamber 4a, the concentrated water from the concentrated water inlet 12a of the fixing member 10a via the flow path 23a to the concentration chamber 5a, the flow path 2a.
Water is passed through the concentrating chamber 5b through 3b.

In the apparatus of the present invention, the desalting chamber 4a and the concentrating chambers 5a, 5b are formed as a ring-shaped chamber by using the cylindrical frame bodies 2a, 2b and the cylindrical electrode plate 7. When there is only one treated water inlet and one concentrated water inlet to the salt chamber 4a and the concentration chambers 5a and 5b, respectively, the desalination chamber 4
There is a possibility that the water to be treated that has flowed into the a and the concentrated water that has flowed into the concentration chambers 5a and 5b may not be uniformly dispersed in the ring-shaped chambers.

If the water is not evenly supplied to the desalting chamber 4a and the concentrating chambers 5a and 5b, the load of impurity ions on the ion exchanger in the desalting chamber 4a may be biased, or the concentrating chamber 5a may be deviated. ,
A difference occurs in the ion concentration within 5b, and the electrode rod 6 and the electrode plate 7
There is a risk that the potential distribution when a current is applied between the two will not be concentric and the movement of the impurity ions will be biased, which will interfere with the deionization of the water to be treated.

Therefore, for each of the flow paths 13a, 23a, 23b, a plurality of branched flow paths are provided to provide a plurality of treated water inlets and a plurality of concentration chamber inlets, or the flow path 13 is provided.
It is preferable that each of a, 23a, and 23b has a single flow path, and annular grooves are provided at the treated water inlet and the concentrated water inlet as described below. That is, in the embodiment of the present invention shown in FIG. 1, it is illustrated on the surface of the fixing member 4a at the boundary between the fixing member 10a and the desalting chamber 4a and at the boundary between the fixing member 10a and the concentration chambers 5a and 5b. Such ring-shaped grooves 14a, 14b, 14c are formed. Grooves 14a, 1
4b and 14c are formed along the lower surfaces of the desalting chamber 4a, the concentration chamber 5a and the concentration chamber 5b, respectively, and are provided so as to communicate with the flow paths 13a, 23a and 23b, respectively.

The desalting chamber 4a and the concentrating chambers 5a and 5b have the same outlet side. That is, a ring-shaped groove 14d is provided along the upper surface of the deionization chamber 4a in the boundary portion of the fixing member 10b with the deionization chamber 4a, and the boundary portions with the concentration chambers 5a and 5b of the fixing member 10b are respectively formed. Concentration chamber 5
Ring-shaped grooves 14e and 14f are provided along the upper surfaces of a and 5b, and these grooves 14d, 14e and 14f communicate with the flow paths 13b, 23c and 23d, respectively.

In the present invention, it is preferable to insert a filter 15a at the boundary between the fixing members 10a and 10b and the desalting chamber 4a. Further, the present invention is directed to the fixing members 10a, 10
b and the fixing member 10 as well as the boundary portion between the desalination chamber 4a.
Filters 15b and 15c may be provided at the respective boundary portions between a and 10b and the concentration chambers 5a and 5b.

Specifically, in the embodiment of the present invention shown in FIG. 1, filters 15a are provided between the desalting chamber 4a and the grooves 14a and 14d, respectively, and the concentrating chamber 5a and the grooves 14b and 14e are also provided. And between the concentrating chamber 5b and the grooves 14c, 14
Filters 15b and 15c are also interposed between them and f, respectively. The filters 15a, 15b and 15c are shown in FIG.
As shown in FIG.

With this structure, the flow path 13
The water to be treated and the concentrated water that have been passed through a, 23a, and 23b once flow into the grooves 14a, 14b, and 14c, respectively, and are once dispersed in the grooves 14a, 14b, and 14c. After that, the water flows into the desalting chamber 4a and the concentrating chambers 5a and 5b, respectively, so that water can be passed to the desalting chamber 4a and the concentrating chambers 5a and 5b in a uniformly dispersed state.

Further, the water to be treated (desalinated water) flowing out of the desalting chamber 4a and the concentrated water flowing out of the concentrating chambers 5a, 5b once flow into the grooves 14d, 14e, 14f, respectively, and the water is uniformly collected there. After being processed, the flow path 13
Since it flows out from the treated water outlet 11b and the concentrated water outlet 12b through b, 23c, and 23d, the treated water (demineralized water) and the concentrated water do not deviate to the vicinity of the outlet, and the desalting chamber and the condensing chamber are concentrated throughout. Uniform water flow to the chamber and uniform outflow from the desalination chamber and the concentration chamber are performed.

The filters 15a, 15b and 15c include
A material having a mesh mesh that does not allow an ion exchanger or the like to pass through is used, and the following advantages are obtained particularly when an ion exchange resin is used as the ion exchanger. That is, by removing either one of the fixing members 10a and 10b, and then pouring the ion-exchange resin in a slurry state containing water into the desalting chamber 4a, the ion-exchange resin is filled while discharging excess water. Therefore, it becomes very easy to fill the ion exchange resin. Note that the same can be said when the concentration chambers 5a and 5b are filled with an ion exchange resin as a conductor.

When deionizing the water to be treated using the apparatus of the present invention, the water to be treated is passed into the desalination chamber 4a through the water inlet 11a and the flow passage 13a, and the concentrated water inlet 12a. The concentrated water is allowed to flow into the concentrating chambers 5a and 5b through the flow paths 23a and 23b, and one end of the electrode rod 6 protruding on the upper surface of the fixing member 10b and the projecting piece 7a of the electrode plate 7 are used as a DC power source. Connect and pass a current between both electrodes.

The water to be treated flowing in the deionization chamber 4a comes into contact with the cation exchanger and the anion exchanger to be deionized.
The cations in the deionization chamber 4a move to the adjacent concentration chamber (for example, the concentration chamber 5b) through the cation exchange membrane (for example, the ion exchange membrane 3b), and the anions are for the anion exchange membrane (for example, the ion exchange membrane 3a). ) To the adjacent concentrating chamber (for example, concentrating chamber 5a), and is received by the concentrated water flowing in the concentrating chambers 5a and 5b, respectively.

The deionized water to be treated (deionized water) flows out of the system from the desalination chamber 4a through the flow path 13b and the water to be treated outlet 11b. On the other hand, the concentrated water is concentrated in the concentration chambers 5a and 5a.
It flows out of the system from b through the flow paths 23c and 23d and the concentrated water outlet 12b.

The present invention is not limited to the case where the treated water and the concentrated water are allowed to flow upward from the treated water inlet 11a and the concentrated water inlet 12a, respectively.
May be used as the treated water inlet, and the concentrated water outlet 12b may be used as the concentrated water inlet to allow the treated water and the concentrated water to flow downwardly.

In the present invention, the ion exchange membranes 3a and 3b are used.
Is supported by the frame bodies 2a and 2b and is housed in the cylindrical casing 9, so that the ion exchange membrane 3 is not deformed as compared with the case where the ion exchange membrane is supported by a flat frame body in a flat plate shape. In the present invention, the number of the ion exchange membranes 3a and 3b is not so large that the ion exchange membranes 3a and 3b are peeled off from the frames 2a and 2b.

Further, in the case of the conventional deionized water production apparatus as described above, it is necessary to use a pressing plate having a robust structure in order to suppress the deformation of the ion exchange membrane. Although there is a problem that the cost is high and it is difficult to increase the size of the device, the present invention has no room for such a problem.

Moreover, in the conventional apparatus, the area of the ion exchange membrane could not be increased, and there was a limit in enhancing the processing capacity of the apparatus, but in the present invention, the area of the ion exchange membrane is larger than that of the conventional apparatus. Can be significantly increased.

In the example of the device of the present invention described above, the electrode rod 6
And the electrode plate 7 are divided into three sections a by frames 2a and 2b,
Partitioning into b and c, compartment b as demineralization chamber 4a, and compartments a and c
, But the device of the present invention is not limited to the above-mentioned embodiment, and the device between the electrode rod 6 and the electrode plate 7 can be formed as in another example of the device of the present invention shown in FIG. Four cylindrical frames 2a, 2b, 2c, and 2d having a cation-exchange membrane or an anion-exchange membrane supported therein, and a frame having the cation-exchange membrane supported and a frame having the anion-exchange membrane supported. Arranged so that the body and the body are alternately arranged, and divided into five compartments a, b, c, d, and e, compartments b and d are desalting chambers, and compartments a, c, and e are concentrating chambers. Good.

That is, among the sections a, b, c, d, and e formed between the electrode rod 6 and the electrode plate 7, the section a located at the innermost side and the section e located at the outermost side are If every other of the above compartments is configured as a concentrating chamber so as to be configured as a concentrating chamber, and the other compartments b and d sandwiched between the concentrating chambers are configured as deionization chambers, they are formed between both electrodes. The number of divided sections and the number of frame bodies that partition the sections are not limited.

When an ion exchange resin as an ion exchanger is filled in the desalting chamber, the ion exchange resin is filled by mixing a cation exchange resin and an anion exchange resin, or a cation exchange resin. The anion exchange resin and the anion exchange resin are alternately packed in layers, but when the ion exchange resin is filled in the desalting chamber in the latter aspect of the present invention, a ring-shaped member 16 as shown in FIGS. Thus, it is preferable to partition the interface between the cation exchange resin and the anion exchange resin to prevent the cation exchange resin and the anion exchange resin from mixing with each other.

The member 16 is provided with a plurality of holes 18 for allowing water to be treated to pass therethrough, and the holes 18 are covered with a filter 17 which allows water to pass therethrough but does not allow ion exchange resin to pass therethrough. ing.

[0053]

According to the present invention, a plurality of frames having different diameters supporting a cation exchange membrane or an anion exchange membrane are concentrically arranged, and a space formed between the frames is a desalting chamber. Since it is configured as a concentrating chamber and the cation exchange membrane and the anion exchange membrane are supported and fixed along the curved surface of the frame,
The physical supporting and fixing force is strong. Therefore, even if the water to be treated and the concentrated water are respectively passed through the desalting chamber and the concentrating chamber, pressure is applied to the desalting chamber and the concentrating chamber, and even if the force is exerted on the ion exchange membrane, The ion exchange membrane is not easily deformed. As a result, there is no fear that peeling will occur between the ion exchange membrane and the frame, or the breakage of the ion exchange membrane will occur, and unexpectedly mixing concentrated water into deionized water as in the past. The deionization treatment can be stably performed without causing a situation.

Further, it is not necessary to use a pressing plate having a robust structure in order to suppress the deformation of the ion exchange membrane, so that the manufacturing cost and the cost for carrying in and installing can be reduced. In addition, the area of the ion-exchange membrane can be markedly increased as compared with the conventional apparatus, which has an advantage that the processing capacity of the apparatus can be increased.

In the present invention, the frame body is composed of the inner frame and the outer frame having the ribs arranged in a grid pattern, and the ion exchange membrane is sandwiched between the inner frame and the outer frame. As a result, problems such as peeling of the ion exchange membrane are less likely to occur, and the ion exchange membrane can be firmly supported on the frame.

In the present invention, when the plurality of frame bodies, the outer electrodes, and the center electrode are arranged concentrically and are supported and fixed by a pair of upper and lower fixing members, desalting is performed on the pair of fixing members. By providing the grooves along the chamber and the concentrating chamber, it is possible to uniformly pass the water to be treated and the concentrated water to the desalting chamber and the concentrating chamber. Further, by interposing a filter at the boundary between the fixing member and the desalting chamber, when the ion exchange resin is used as the ion exchanger, it is very easy to fill the desalting chamber with the ion exchange resin. Become.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of the deionized water producing apparatus of the present invention.

FIG. 2 is a plan view showing an example of the deionized water production apparatus of the present invention.

FIG. 3 is a plan sectional view taken along the line III-III in FIG.

4 is a plan sectional view taken along the line IV-IV in FIG.

5 is a plan sectional view taken along line VV of FIG.

FIG. 6 is an exploded perspective view showing an example of the deionized water producing apparatus of the present invention.

FIG. 7 is an explanatory view showing an example of supporting an ion exchange membrane on a frame in the present invention.

FIG. 8 is a vertical cross-sectional view showing another example of the deionized water producing apparatus of the present invention.

FIG. 9 is a plan view showing an example of a ring-shaped member that partitions an interface between a cation exchange resin and an anion exchange resin.

10 is a vertical cross-sectional view taken along line XX of FIG.

FIG. 11 is a vertical cross-sectional view showing an example of a conventional deionized water production apparatus.

FIG. 12 is an exploded perspective view showing an example of a conventional deionized water production apparatus.

FIG. 13 is an explanatory view showing a modification of the ion exchange membrane in the conventional device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electric deionized water manufacturing apparatus 2a, 2b, 2c, 2d Frame 3, 3a, 3b Ion exchange membrane 4a Desalination chamber 5a, 5b Concentration chamber 6 Electrode rod (center electrode) 7 Electrode plate (outer electrode) 10a, 10b Fixed member 11a Treated water inlet 11b Treated water outlet 12a Concentrated water inlet 12b Concentrated water outlet 14a, 14b, 14c, 14d, 14e, 14f Grooves 15a, 15b, 15c Filter 21 Inner frame 22 Outer frame 24 Ribs a, b , C, d, e compartment

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) C02F 1/469 B01D 61/46 C02F 1/42

Claims (6)

(57) [Claims] 1. A plurality of frame bodies having different diameters and supporting a cation exchange membrane or an anion exchange membrane are arranged concentrically, and the outer periphery of the outer frame body and the inner periphery of the inner frame body are respectively arranged. Electrodes are arranged and the space formed between the frames is alternately divided into a desalting chamber and a concentrating chamber, and the outermost compartment and the innermost compartment are used as the concentrating chamber to desalinate. An electric deionized water production device characterized in that the chamber is filled with an ion exchanger. 2. A cation exchange membrane or an anion exchange membrane is supported on each of a plurality of frame bodies formed in a tubular shape and having different diameters,
An outer electrode composed of the frame body and a tubular electrode plate formed with a diameter larger than those of the frame body, and a counter electrode of the outer electrode, and a tubular body formed with a diameter smaller than the frame body. A center electrode composed of an electrode plate or an electrode rod is arranged concentrically around the center electrode so that the frame body supporting the cation exchange membrane and the frame body supporting the anion exchange membrane alternate. At least three compartments are formed between the outer electrode and the center electrode by arranging them so that the innermost compartment and the outermost compartment of these compartments are configured as a concentrating chamber. Every other one of the above compartments is configured as a concentrating chamber, and the other compartments sandwiched between the concentrating compartments are filled with a cation exchanger and an anion exchanger to constitute a desalting chamber. An electric deionized water production device characterized by: 3. A frame body comprising an inner frame and an outer frame having ribs arranged in a lattice pattern, and an ion exchange membrane is sandwiched between the inner frame and the outer frame. Electric deionized water production equipment. 4. A plurality of frame bodies, an outer electrode and a center electrode are concentrically arranged, and these are supported and fixed by a pair of upper and lower fixing members to form a desalting chamber and a concentrating chamber, and one fixing member. The electric deionized water producing apparatus according to claim 2 or 3, wherein the treated water inlet and the concentrated water inlet are provided in the other, and the treated water outlet and the concentrated water outlet are provided in the other fixing member. 5. A ring-shaped groove is provided in one fixing member along the upper surface of each of the desalting chamber and the concentrating chamber, and the other fixing member is provided along the lower surface of each of the desalting chamber and the concentrating chamber. The electric deionized water manufacturing apparatus according to claim 4, wherein a ring-shaped groove is provided, and these grooves are connected to the treated water inlet, the concentrated water inlet or the treated water outlet, and the concentrated water outlet. 6. A plurality of frame bodies, an outer electrode and a center electrode are arranged concentrically, and these are supported and fixed by a pair of upper and lower fixing members to form a desalting chamber and a concentrating chamber. The electric deionized water producing apparatus according to claim 2, 3, 4, or 5, wherein a filter is provided at the boundary with the salt chamber.