Process for electrolyzing alkali metal chloride

Details Process for electrolyzing alkali metal chloride Process for electrolyzing alkali metal chloride

C - Chemistry, Metallurgy

25

B

204/202, 204/52.

C25B 1/46 (2006.01) C25B 13/08 (2006.01)

Patent

CA 1151110

ABSTRACT OF THE DISCLOSURE An aqueous solution of an alkali metal chloride is elec- trolyzed using a cation exchange membrane having two layers comprising a first layer made of a fluorocarbon polymer having (a) groups of the formula -O(CF2)nCOOM where M represents H, an alkali metal atom or -NH4; and n=2 to 5 and a second layer made of a fluorocarbon polymer having (b) groups of the formula -O(CF2)nSO3M where M and n are defined above in which the layer having (b) groups of the formula -O(CF2)nSO3M faces an anode compartment. The layer having (b) groups of the formula -O(CF2)nSO3M is formed by treating a cation exchange membrane having (a) groups of the formula -O(CF2)nCOOM and an ion ex- change capacity of 1.1 to 2.0 meq./g. dry resin to convert (a) groups of the formula -O(CF2)nCOOM in one layer into groups of -O(CF2)nI (n=2 to 5) and further to convert the groups into groups of the formula -O(CF2)nSO3M where M and n are defined above.

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