Patent ID: 9701547
Date: 2017-07-11
CPC Classifications: B01D,B01J,C02F,F24D

Claim:
1. An ion exchanger comprising: a porous positive ion exchanger having binder particles and particles of positive ion exchange resin which adheres positive ions, wherein the positive ion exchanger is formed into a sheet shape; and a porous negative ion exchanger having binder particles and particles of negative ion exchange resin which adheres negative ions, wherein the positive ion exchanger is formed into a sheet shape, wherein the positive ion exchanger includes a first positive ion exchange layer bonded to the negative ion exchanger to form the interface, and a second positive ion exchange layer laminated on a surface of the first positive ion exchange layer opposite from the interface, the negative ion exchanger includes a first negative ion exchange layer bonded to the positive ion exchanger to form the interface, and a second negative ion exchange layer laminated on a surface of the first negative ion exchange layer opposite from the interface, an ion exchange capacity of the negative ion exchanger is greater than that of the positive ion exchanger, wherein the ion exchange capacity of the second positive ion exchange layer is greater than that of the first positive ion exchange layer, and the ion exchange capacity of the second negative ion exchange layer is greater than that of the first negative ion exchange layer, a film thickness of the first positive ion exchange layer is thinner than that of the second positive ion exchange layer, and a film thickness of the first negative ion exchange layer is thinner than that of the second negative ion exchange layer, and the second positive ion exchange layer, the first positive ion exchange layer, the first negative ion exchange layer and the second negative ion exchange layer are laminated in order.