JP2002001072A - Deionization module and electric type device for producing deionized water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both an electric type device for producing deionized water, in which treated water having excellent water quality can be stably produced even in such operation that pressure difference is caused in a desalination chamber and a concentration chamber, and a deionization module used therefor. SOLUTION: The deionization module 10 for the electric type device for producing deionized water is laminated with a cation exchange membrane 1, a cell frame 3 and an anion exchange membrane 2, and an ion exchanger is packed in the inside. In the cation exchange membrane 1 and the anion exchange membrane 2 of the deionization module, a supporting cloth 9 is used as a base material or a supporting material 9 is used as a base material or a supporting material and also, in an assembly state, both the fiber direction 11 of the supporting cloth 9 and the direction of an edge 11a in the inside of the cell frame 3 are in the mutually different directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the field of semiconductor manufacturing,
The present invention relates to an electric deionized water production apparatus and a deionization module used in various fields such as medical and pharmaceutical manufacturing fields, power generation fields such as nuclear power and thermal power, food industries, and research laboratories.

[0002]

2. Description of the Related Art Conventionally, an ion exchange resin has been used for producing deionized water. This ion exchange resin
Usually requires regeneration with drugs. Therefore, the combination of deionization using the ion exchange resin and electrodialysis,
2. Description of the Related Art There is known an electric deionized water producing apparatus which does not require regeneration with a chemical and obtains highly deionized water.

The electric deionized water producing apparatus is, for example,
Basically, a cation exchange membrane, a cell frame with a hollow inside and an anion exchange membrane are laminated, and an ion exchanger is filled inside to form a deionization module, and the water to be treated is passed through the ion exchanger. In addition, a direct current is applied through the both ion exchange membranes to produce deionized water while electrically removing ions in the water to be treated from the concentrated water flowing outside the both ion exchange membranes. is there.

The ion exchange membranes such as the cation exchange membrane and the anion exchange membrane constituting the deionization module are usually formed of a heterogeneous membrane obtained by crushing an ion exchanger such as an ion exchange resin and molding it with a binder, and a styrene. , D
There are two types of homogeneous membranes made by impregnating or applying a liquid consisting of VB, a plasticizer and a polymerization catalyst onto a supporting cloth or the like. Recently, however, the electrical resistivity is higher than that of a heterogeneous membrane having a high electric resistance and a low transport number. Homogeneous membranes with low transit numbers and high transit rates are preferred.

[0005]

However, in such an electric deionized water producing apparatus, when the operation is performed such that a pressure difference is generated between the desalting chamber and the concentrating chamber, the water flows out of the desalting chamber. The quality of the treated water may be significantly reduced. In this case, a problem such as an increase in voltage also occurs, leading to the worst case of stopping the operation. Such a problem occurred even at a relatively low pressure difference between the desalting chamber and the concentrating chamber. That is, the electric deionized water production apparatus, for example, occurs under normal operating conditions, such as pressure fluctuations in the desalination chamber due to increase or decrease in treated water, pressure fluctuations in the concentration chamber due to fluctuations in the supply flow rate to the concentration chamber, and the like. Such a sudden drop in the quality of the treated water, which occurs under normal operation, is a difficult problem of unknown origin.

Accordingly, an object of the present invention is to provide an electric deionized water producing apparatus capable of stably producing treated water having excellent water quality even under an operation in which a pressure difference is generated between a desalting chamber and a concentrating chamber, and an apparatus for producing the same. It is to provide a deionization module to be used.

[0007]

Under such circumstances, the present inventors have conducted intensive studies and as a result, (1) disassembled the electric deionized water producing apparatus which has fallen into such a situation. The ion-exchange membrane was broken, and this break was near the inner edge of the cell frame as if it had been cut off at the edge. (2) The ion-exchange membrane was attached to the cell frame. That, the fiber direction of the support cloth, which is the base material of the ion exchange membrane, and the direction of the inner edge of the cell frame were performed in the same direction, that is, the fiber direction of the ion exchange membrane when shipping the product, It is a precise roll winding in the horizontal and vertical directions, and when using this to assemble the deionization module, it is natural to increase the yield (utilization rate) of the ion exchange membrane and the fiber direction of the supporting cloth and the cell. Line with the direction of the inner edge of the frame (3) And such an assembling method surprisingly makes it easy for the ion exchange membrane to easily move in the fiber direction at the inner edge of the cell frame even at a relatively low pressure difference between the desalting chamber and the concentrating chamber. A strong ion exchange membrane that does not break easily, even if it is torn, but the support cloth is attached to the cell frame only with the fiber direction inclined slightly (different) to the inner edge of the cell frame. The inventors have found that a surface can be obtained, and have completed the present invention.

That is, the present invention (1) relates to a deionization apparatus for an electric deionized water producing apparatus in which an ion exchange membrane is stacked on one side, a cell frame and an ion exchange membrane on the other side, and is filled with an ion exchanger. In the ion module, a support cloth is used as a base material or a support material for the ion exchange membrane, and in an assembled state, a fiber direction of the support cloth and a direction of an inner edge of the cell frame are in directions different from each other. The present invention provides a deionization module characterized by the following. By adopting such a configuration, a pressure difference is generated between the desalting chamber and the concentrating chamber. In particular, when the pressure in the concentrating chamber is higher than the pressure in the desalting chamber, the inner edge of the cell frame cuts into the ion exchange membrane and the cutting force is reduced. It does not break easily when added.

Further, the present invention (2) is characterized in that one side of the ion exchange membrane, one cell frame, the intermediate ion exchange membrane, the other side of the cell frame and the other side of the ion exchange membrane are laminated, and the two insides are ion exchanged. In a deionization module for an electric deionized water producing apparatus in which a body is filled, the ion exchange membrane uses a support cloth as a base material or a support material, and in an assembled state,
It is an object of the present invention to provide a deionization module, wherein a fiber direction of the support cloth and a direction of an inner edge of the cell frame are different from each other. By adopting such a configuration, an intermediate ion exchange membrane is further newly provided between the cation exchange membrane and the anion exchange membrane in the conventional desalination chamber, and the desalination chamber is provided with two small desalination chambers. The same effect as the above-described invention can also be obtained in an electric deionized water production apparatus having a novel structure in which a small desalination chamber effluent is used as one small desalination chamber inflow water and the other small desalination chamber inflow water is used.

In the invention (3), the angle formed by the fiber direction of the support cloth and the direction of the inner edge of the cell frame is 5 to 45 degrees. ) Or (2). By adopting such a configuration, the same effects as those of the above-described invention can be obtained, and the setting can be performed over a wide angle range. Therefore, an instrument for adjusting the angle is not required and can be easily assembled.

[0011] The present invention (4) provides the deionization module according to any one of (1) to (3), wherein the inner edge of the cell frame has a chamfered corner. It is. By adopting such a configuration, in addition to the same effect as the above-described invention, even if the inner edge of the cell frame bites into the ion exchange membrane, the cutting force does not work, and the ion exchange membrane is further hardly broken.

Further, the present invention (5) provides the above (1) to (5).
(4) A plurality of the deionization modules described above are arranged side by side with a spacer interposed therebetween to form a desalination chamber and a concentration chamber,
It is an object of the present invention to provide an electric deionized water producing apparatus, wherein the desalting chamber and the concentrating chamber are arranged between an anode and a cathode. By adopting such a configuration, for example,
Even under an operation in which a pressure difference occurs between the desalting chamber and the concentrating chamber, an apparatus capable of stably producing treated water having excellent water quality for a long period of time can be obtained.

Further, the present invention (6) is characterized in that the arrangement of the desalting chamber and the concentrating chamber of the electric deionized water producing apparatus is a spiral type, a concentric type or a flat plate type. 5) An electric deionized water producing apparatus according to the aspect described above. By adopting such a configuration, such a deionized module structure can be applied to any type of electric deionized water producing apparatus, and the range of application is widened and the scope of selection is increased.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A deionization module according to an embodiment of the present invention will be described with reference to FIGS. Figure 1
FIG. 2 is an exploded perspective view of the deionization module according to the first embodiment of the present invention, FIG. 2 is a partial view of an assembled state taken along line AA in FIG. 1, and FIG. Are partial schematic diagrams in which are laminated. In the deionization module 10 of the first embodiment, a cation exchange membrane 1 on one side, a cell frame 3 having a four-sided frame body whose inside is hollowed out, and an anion exchange membrane 2 on the other side are laminated, and the inside 7 Is filled with an ion exchanger 8 (not shown in FIG. 1). Also, the deionization module 10,
Numeral 10 is laminated with a rubber spacer 6 interposed therebetween, and a space 5 formed by the anion exchange membrane 2 of one deionization module 10 and the cation exchange membrane 1 of the other deionization module 10 is a concentration chamber. Note that, in FIGS. 1 to 3, the flow path is omitted in any case.

In the deionization module 10, the cation exchange membrane 1 and the anion exchange membrane 2 are both homogeneous membranes in which a support cloth is used as a base material or a support material. The method for producing a homogeneous membrane includes known methods. For example, as a common membrane for the cation exchange membrane 1 and the anion exchange membrane 2, a liquid composed of styrene, DVB, a plasticizer, and a polymerization catalyst is previously applied to a support cloth or the like. Impregnating or coating to produce a homogeneous film, or polyvinyl chloride film with styrene, D
Impregnated in a liquid composed of VB, plasticizer and polymerization catalyst, taken out after a certain period of time, hot-pressed, and made a homogeneous film using a support cloth as a support material to improve dimensional stability And the like.

In the assembled state of the deionization module 10, the cation exchange membrane 1 and the anion exchange membrane 2 are arranged so that the fiber direction of the support cloth 9 and the direction of the inner edge 31 of the cell frame 3 are different from each other. is there. That is, as shown in FIG. 2, for example, the cation exchange membrane 1 has a fiber direction X of the warp 11 of the support cloth 9 which is a constituent member of the cation exchange membrane 1.
−X and an inner edge 311 of the vertical member 31 a of the cell frame 3
It is installed while maintaining an angle a with the direction Y-Y of a.
The support cloth 9 is the same as a normal cloth, and the orthogonal weft 12
And the warp 11 are interwoven. The weft yarns 12 and the warp yarns 11 may be the same or different in the number of battings per unit area. Such fiber directions of the weft yarn 12 and the warp yarn 11 can be observed visually or with a magnifying glass.

The fact that the fiber direction of the support cloth 9 and the direction of the inner edge 31 of the cell frame 3 are different from each other means that the fiber direction XX of the weft 11 of the support cloth 9 and the cell direction The angle a of the inner edge 311a of the third vertical member 31a with the direction YY is 5 to 45 degrees, preferably 10 to 45 degrees,
More preferably, it is 30 to 45 degrees. If the angle a is within this range, even if the inner edge of the cell frame bites into the ion exchange membrane and a cutting force is applied, for example, under an operation in which a pressure difference occurs between the desalting chamber and the concentrating chamber, the angle a is easily changed. There is no tear. If the angle a is 5 degrees or more, after assembly, the water to be treated is supplied to the desalting chamber, and the support cloth 9 swells or is pressed by the pressure of the concentrating chamber, so that the position is slightly shifted. Even if this happens, the fiber direction of the support cloth 9 does not match the direction of the inner edge 31 of the cell frame 3. Also,
For the inner edge direction of the lateral member 31b of the cell frame,
The fiber direction of the weft 12 of the support cloth 9 is defined in the same manner as described above. In FIG. 2, reference numeral 13 is used for describing the fiber direction and is shown in a part of the support cloth 9.

As shown in FIG. 3, the inner edge 311a of the cell frame 3 may be chamfered. Even if the inner edge 311a of the cell frame bites into the cation exchange membrane 1 due to this chamfering, the ion exchange membrane is not easily broken because the cutting force does not work and the cell is brought into contact. The chamfer may be any shape as long as the angle of the corner of the edge 311a is eliminated by 90 degrees, and may be a round chamfer or a square chamfer.

FIG. 4 is an exploded perspective view of a deionization module according to a second embodiment of the present invention, and FIG. 5 is a partial view in which two deionization modules are stacked. 4 and 5, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof will be omitted. Only different points will be described. That is, the deionization module 10a according to the second embodiment includes a cation exchange membrane 1 on one side, one cell frame 3a whose inside is hollowed out, an intermediate ion exchange membrane 21, and another cell frame whose inside is hollowed out. 3
b and the anion exchange membrane 2 on the other side, and two interiors 7a and 7b are filled with an ion exchanger 8 (not shown in FIG. 4). In addition, the deionization modules 10a, 1
Numeral 0a is laminated with a rubber spacer 6 interposed therebetween, and a space 5 formed by the anion exchange membrane 2 of one deionization module 10a and the cation exchange membrane 1 of the other deionization module 10a is a concentration chamber.

The electric deionized water producing apparatus of the present invention is not particularly limited. For example, a flat-plate type electric deionized water producing apparatus is the most widely used type, and as shown in FIG. A plurality of deionization modules 10 are arranged side by side with a spacer 6 interposed therebetween to form a desalination chamber 4 and a concentration chamber 5, and the deionization chamber 4 and the concentration chamber 5 are not shown in the drawing. As shown in FIG. 5, a plurality of deionization modules 10a are arranged side by side with spacers 6 interposed therebetween, and small deionization chambers 4a, 4
b, a desalting chamber 4 and a concentrating chamber 5 provided with b, and the desalting chamber 4 and the concentrating chamber 5 are arranged between an anode and a cathode (not shown).

Further, the arrangement of the desalting chamber and the concentrating chamber of the apparatus may be of a spiral type or a concentric type.
A spiral-type electric deionized water production apparatus, for example, winds a cation exchange membrane and an anion exchange membrane around a center electrode so that a spiral cross section is formed, and surrounds a desalination chamber and a concentration chamber along the spiral winding. A configuration in which an electrode is arranged outside the wound film is exemplified (for example, Japanese Patent Application Laid-Open No.
No. 7645). The concentric electric deionized water producing apparatus includes, for example, a plurality of cylindrical frames having different diameters that support a cation exchange membrane or an anion exchange membrane are concentrically arranged, and the outer periphery and the inner periphery of the outer frame are disposed. Electrodes are arranged around the inner periphery of the frame body, and the space formed between the frame bodies is alternately partitioned into a desalination chamber and a concentration chamber, and the outermost section and the innermost section Is a concentration chamber, and a desalting chamber is filled with an ion exchanger (for example, Japanese Patent Application Laid-Open No. 9-285790).

In the case of a spiral-type electric deionized water producing apparatus, the cell frame is attached to the end of the wound membrane in the same wound manner. In the case of a concentric electric deionized water producing apparatus, the apparatus is similarly attached in a cylindrical form to the ends of a plurality of cylindrical frames having different diameters that support a cation exchange membrane or an anion exchange membrane. Also in these cases, the installation direction of the support cloth on the cell frame is the same as that described above.

[0023]

Next, the present invention will be described more specifically with reference to examples. Example 1 Using an experimental simulated deionization module shown in FIGS. 6 (A) and 6 (B), an ion exchange membrane water breakage test was performed. FIG.
FIG. 7B is a view taken along line BB in FIG.
The experimental simulated deionization module 20 is composed of a cell frame 52 of a desalination chamber having a width of 100 mm × a height of 100 mm × a thickness of 8 mm, a cation exchange membrane 51 (“C66-10F” manufactured by Tokuyama) and a width of 100 mm.
A cell frame 55 having a height of 100 mm and a thickness of 8 mm was stacked to form a desalting chamber 57 and a concentrating chamber 53 partitioned by a cation exchange membrane 51. At this time, the cation exchange membrane 51 was assembled such that the angle b between the direction of the edge 58a of the desalting chamber cell frame 52 and the fiber direction of the support cloth was 15 degrees (FIG. 6).
(B)). In the desalting chamber 57, a support (non-woven fabric) (width 100 mm × height 85 mm × thickness 8 m) is used instead of the ion exchange resin.
m) 54 is filled in the lower part, and the cavity part (width 100 mm x
(Height: 15 mm × thickness: 8 mm) 56 were provided. Water is passed only through the concentrating chamber, and while changing the water passing pressure, the breaking point 58 of the cation exchange membrane 51 (the thick line in the figure) is observed. Desalination chamber pressure)
I asked. In addition, since the experimental simulated deionization module 20 uses a transparent cell frame, the tearing phenomenon is visually observed, but the drop in the concentration chamber pressure was simultaneously observed. Table 1 shows the results.

Example 2 The same procedure and evaluation as in Example 1 were carried out except that the angle of attachment b of the cation exchange membrane 51 was changed from 15 degrees to 45 degrees.
Table 1 shows the results.

Comparative Example 1 The same procedure and evaluation as in Example 1 were conducted except that the angle of attachment b of the cation exchange membrane 51 was changed from 15 degrees to 0 degree. Table 1 shows the results.

[0026]

[Table 1]

From Table 1, it can be seen that the edge 58a of the desalination chamber cell frame 52
It can be seen that when the cation exchange membrane is installed with the direction of the fiber different from that of the support cloth, the breaking strength is about 1.6 to 1.8 times higher than when the cation exchange membrane is installed with the fiber direction aligned.

[0028]

According to the present invention (1), a pressure difference is generated between the desalting chamber and the concentrating chamber. In particular, the inner edge of the cell frame is pressed by the pressure from the concentrating chamber side to the desalting chamber side. Even if a cutting force is applied to the cut, it is not easily broken. According to the present invention (2), an intermediate ion exchange membrane is additionally provided between the cation exchange membrane and the anion exchange membrane in the conventional desalination chamber, and the desalination chamber is provided with two small desalination chambers. In the electric deionized water production apparatus having a novel structure in which the exchange membrane is adjacent to each other and the outflow of one small desalination chamber is used as the inflow of the other small desalination chamber, the same effects as those of the invention can be obtained. Play.

According to the present invention (3), since setting can be performed over a wide angle range, an instrument or the like for angle adjustment is not required, and assembly can be performed easily. According to the present invention (4), even if the inner edge of the cell frame bites into the ion-exchange membrane, the cutting force does not work, and the ion-exchange membrane is more difficult to break. According to the present invention (5), it is possible to obtain an apparatus capable of stably producing treated water having excellent water quality over a long period of time even under an operation in which a pressure difference occurs between the desalting chamber and the concentration chamber. . According to the present invention (6), such a deionized module structure can be applied to any type of electric deionized water producing apparatus, and the range of application is widened and the scope of selection is increased.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a deionization module according to a first embodiment of the present invention.

FIG. 2 is a partial view in an assembled state viewed along line AA in FIG. 1;

FIG. 3 is a partial schematic view in which two deionization modules of the first embodiment are stacked.

FIG. 4 is an exploded perspective view of a deionization module according to a second embodiment of the present invention.

FIG. 5 is a partial schematic view of two stacked deionization modules according to the second embodiment.

6 (A) and 6 (B) show a simulated experimental deionization module used in Examples.

[Explanation of symbols]

 1, 51 Ion exchange membrane (cation exchange membrane) on one side 2 Ion exchange membrane (anion exchange membrane) on the other side 3, 3a, 3b, cell frame 4, 54 Desalination chamber 4a, 4b Small desalination chamber 5, 53 Concentration chamber 6 Spacer 7 Cut-out section 8 Ion exchanger 9 Support cloth 10, 10a Deionization module 11 Warp thread 12 Weft thread 20 Simulated deionization module for experiment 21 Intermediate ion exchange membrane 31a Vertical member 31b Horizontal member 52 Deionization cell frame 55 Concentration room cell frame 56 Cavity 57 Support (nonwoven fabric) 58 Torn point 311a Edge

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) C02F 1/469 C02F 1/46 103 (72) Inventor Yasutaka Shinmei 1-8-2 Shinsuna, Koto-ku, Tokyo Organo Inside (72) Inventor Osamu Kawaguchi 1-2-8 Shinsuna, Koto-ku, Tokyo Organo Corporation (72) Inventor Koji Nakazawa 1-2-8 Shinsuna, Koto-ku, Tokyo Organo F Terms (reference) 4D006 GA17 HA21 HA42 HA44 HA61 JA03A JA03B JA03Z JA04A JA04C JA30A JA43A JA43Z JA44A JA44Z JB01 KA31 KB11 MA02 MA03 MA04 MC24 MC24X MC27 NA41 NA46 PB02 PC01 PC11 PC31 PC32 PC42 4D061 DA01 DB13 EB09 EB09 EB09 EB09 EB09

Claims (6)

[Claims] 1. A deionization module for an electric deionized water production apparatus, wherein the deionization module is laminated with an ion exchange membrane on one side, a cell frame and an ion exchange membrane on the other side, and is filled with an ion exchanger. In the ion exchange membrane, a supporting cloth is used as a base material or a supporting material, and a fiber direction of the supporting cloth and a direction of an inner edge of the cell frame are different from each other in an assembled state. Ion module. 2. An electric type in which an ion exchange membrane on one side, one cell frame, an intermediate ion exchange membrane, another cell frame and an ion exchange membrane on the other side are laminated, and two insides are filled with an ion exchanger. A deionization module for a deionized water production device, wherein the ion exchange membrane uses a support cloth as a base material or a support material, and in an assembled state, a fiber direction of the support cloth and an inner edge of the cell frame. A deionization module, wherein the direction is different from the direction. 3. The deionization module according to claim 1, wherein an angle formed by a fiber direction of the support cloth and a direction of an inner edge of the cell frame is 5 to 45 degrees. . 4. The deionization module according to claim 1, wherein an inner edge of the cell frame has a chamfered corner. 5. A desalination chamber and a concentration chamber, wherein a plurality of the deionization modules according to claim 1 are arranged side by side with a spacer interposed therebetween to form a deionization chamber and a concentration chamber. And an electric deionized water producing apparatus, wherein the concentrating chamber is formed between an anode and a cathode. 6. The electric deionization apparatus according to claim 5, wherein the arrangement of the desalting chamber and the concentrating chamber of the electric deionized water producing apparatus is a spiral type, a concentric type, or a flat plate lamination type. Water production equipment.