Fluorinated cation exchange membrane

Details Fluorinated cation exchange membrane Fluorinated cation exchange membrane

1981-12-08

1983-12-27

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Ion-exchange polymer or process of preparing

521 30, 20415917, B01J 4712, C08F 600

Patent

active

044231571

ABSTRACT:
There is disclosed a fluorinated cation exchange membrane having a multi-layered structure, of which one layer contains sulfonic acid groups as ion-exchange groups and the other layer contains carboxylic acid groups as principal ion-exchange groups. The membrane is treated with an acid, followed by heat treatment at an elevated temperature in an aqueous atmosphere or aqueous solution whereby improved electrolytic performance such as electrolysis voltage and current efficiency when used in electrolysis of sodium chloride for production of caustic soda is obtained.

REFERENCES:
patent: 3644319 (1972-02-01), Seki et al.
patent: 4132682 (1979-01-01), Seita et al.
patent: 4174426 (1979-11-01), Asami et al.
patent: 4176215 (1979-11-01), Molnar et al.

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