Cation-exchange membrane for electrolyzing alkali metal halide

Details Cation-exchange membrane for electrolyzing alkali metal halide Cation-exchange membrane for electrolyzing alkali metal halide

C - Chemistry, Metallurgy

08

F

204/202

C08F 8/36 (2006.01) C08J 5/22 (2006.01) C25B 1/46 (2006.01)

Patent

CA 1174638

ABSTRACT OF THE DISCLOSURE A cation-exchange membrane for carrying out an electro- lyzing method in which an aqueous solution of alkali metal halide is supplied to an anode chamber and water to a cathode chamber to obtain halogen from the anode chamber and hydrogen and an alkali metal hydroxide from the cathode chamber. The cation-exchange membrane is made of a perfluorocarbon polymer and comprises layers including one layer which is used in electrolyzing an aqueous solution of an alkali metal halide for the manufacture of an alkali hydroxide and halogen and has a carboxylic acid group within an extent of depth 5 to 30% of the thickness of the membrane; another which has a weakly acidic group within an extent of depth 5 to 30% of the thickness of the membrane and 10% to less than 100% in ration to the total exchange group of the layer; and a middle layer which has a sulfonic acid group.

363955

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