Producing an alkali metal hydroxide in electrolytic cell...

Details Producing an alkali metal hydroxide in electrolytic cell... Producing an alkali metal hydroxide in electrolytic cell...

C - Chemistry, Metallurgy

25

B

204/156, 204/64.

C25B 1/14 (2006.01) C08J 5/22 (2006.01) C25B 1/46 (2006.01) C25B 13/08 (2006.01)

Patent

CA 1315234

ABSTRACT A method for producing an alkali metal hydroxide by electrolysis in an electrolytic cell comprising an anode compartment and a cathode compartment, which comprises supplying an alkali metal chloride to the anode compartment and water or a dilute alkali metal hydroxide to the cathode compartment, wherein a fluorine-containing cation exchange membrane comprising a first outer layer of a perfluorocarbon polymer having -SO3M groups (wherein M is an alkali metal) with a thickness of at least 5 µ m, and a second layer of a perfluorocarbon polymer having -CO2M groups (wherein M is an alkali metal) and a water content of from 2 to 7% by weight in a 45 wt% NaOH aqueous solution with a thickness of at least 5 µm, the water content of the first layer being higher than that of the second layer, is disposed with the first layer facing the cathode compartment.

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