Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...
Patent
1996-09-19
1998-06-02
Phasge, Arun S.
Chemistry: electrical and wave energy
Processes and products
Electrophoresis or electro-osmosis processes and electrolyte...
204533, 204536, 204632, 521 25, 521 26, 521 27, 521 28, B01J 4700, B01J 4900, B01D 6148
Patent
active
057593736
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 continuation filed Jan. 18, 1996.
TECHNICAL FIELD
The present invention relates to a liquid permeable porous ion exchanger. Particularly, it relates to a porous ion exchanger useful for producing deionized water by electrodialysis.
BACKGROUND ART
As a method for producing deionized water, a method is common wherein water to be treated is supplied to a bed packed with an ion exchange resin to have impurity ions adsorbed and removed on the ion exchange resin to obtain deionized water. Here, a method is adopted wherein ion exchange resins having the adsorbing ability lowered, is regenerated by means of an acid or alkali. However, in this method, waste water containing the acid or alkali used for the regeneration is problematic. Therefore, it is desired to develop a method for producing deionized water, which requires no regeneration.
From such a viewpoint, an attention has been drawn in recent years to a self-regenerating type electrodialytic method for producing deionized water employing a combination of an ion exchange resin and an ion exchange membrane. This method is a method for producing deionized water, wherein a mixture of an anion exchanger and a cation exchanger is accommodated in a demineralizing compartment of an electrodialyzer having an anion exchange membrane and a cation exchange membrane alternately arranged, and while supplying water to be treated to this demineralizing compartment, a voltage is applied to conduct electrodialysis.
With respect to this method, there have been proposed a method of specifying the width and the thickness of the demineralizing compartment (U.S. Pat. No. 4,632,745), a method of using an ion exchange resin having a uniform diameter as the resin to be packed in the demineralizing compartment (U.S. Pat. No. 5,154,809), a method of using an anion exchange resin as the ion exchange resin to be packed at the portion where water to be treated is first passed (Japanese Unexamined Patent Publication No. 71624/1992) and a method of using a mixture of an ion exchange resin and an ion exchange fiber as the ion exchanger to be packed in a demineralizing compartment (Japanese Unexamined Patent Publication No. 277344/1993).
However, these method had drawbacks such that the crosslinked ion exchange resin as the ion exchange resin used in the demineralizing compartment was not fixed, whereby the ion exchanger with the same electric charge tended to flocculate during the use, the ion exchange resin particles or fibers were likely to be broken by water current, and no effective demineralization and regeneration tended to be conducted, and there was a problem in the stability in the purity of obtained water. As a method for mending such drawbacks, there has been proposed a method of introducing ion exchange groups to a nonwoven fabric of e.g. polyethylene or polypropylene by radiation grafting (Japanese Unexamined Patent Publications No. 64726/1993 and No. 131120/1993), or a method wherein an ion exchange polymer and a reinforcing polymer are formed into a composite fiber having a matrix structure, which is then formed into a sheet (Japanese Unexamined Patent Publication No. 79268/1994).
In these methods, the ion exchangers are fixed, but there have been drawbacks that it is necessary to use radiation, the process for producing a composite fiber is complex, and the mechanical strength is not necessarily adequate.
DISCLOSURE OF INVENTION
It is an object of the present invention to provide a self-regenerating type electrodialytic method for producing deionized water using a combination of an ion exchanger and an ion exchange membrane, whereby a fixed ion exchanger is prepared without requiring a complex process such as use of radiation, and highly pure deionized water is produced constantly.
The present invention provides a porous ion exchanger which has a porous structure having ion exchange resin particles bound by a binder polymer, and which has a water permeability of at least 30 kg.multidot.cm.sup.-1 .multidot.hr.sup.-1 under a pressure of 0.35 k
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Iwamoto Junjiro
Komatsu Ken
Miyake Haruhisa
Saito Iku
Terada Ichiro
Asahi Glass Company Ltd.
Phasge Arun S,.
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