PURPOSE: To obtain such a structure of ion exchange resin that ions can easily be moved into and out of the resin, provide a large surface area and enhance the ion exchange performance by molding a porous fine ion exchange resin synthesized by a polymn. technologies such as emulsion polymn. and suspension polymn. into a porous ion exchange resin having a specified diameter with a binder.

CONSTITUTION: A porous fine ion exchange resin 1 having about 0.1-10μm diameter synthesized by a polymn. technologies such as emulsion polymn. and suspension polymn. is formed into a porous ion exchange resin of about 300-1200μm diameter with using a binder 4. Thus, the fine ion exchange resin having micropores synthesized by polymn. technologies such as emulsion polymn. and suspension polymn. is formed into the porous ion exchange resin having micropores with using the binder. Thereby, the micropores in the binder and micropores in the fine ion exchange resin provide such effects that ions can be easily moved into and out of the resin, a large surface area is obtd. and the ion exchange performance is greatly enhanced.