Method for producing an alkali metal hydroxide

Details Method for producing an alkali metal hydroxide Method for producing an alkali metal hydroxide

C - Chemistry, Metallurgy

25

B

204/202, 204/64.

C25B 1/46 (2006.01) C08J 5/22 (2006.01) C25B 13/04 (2006.01)

Patent

CA 1325195

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 aqueous alkali metal chloride solution to the anode compartment and withdrawing an aqueous alkali metal hydroxide solution from the cathode compartment, wherein a fluorine-containing cation exchange membrane comprising a first layer of an alkali resistant cation exchanger with a thickness of at least 5 µm selected from the group consisting of the following (a), (b) and (c), 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, is disposed with the first layer facing the cathode compartment: (a) a layer of a cation exchanger having alkali resistant inorganic particles or fibrils dispersed therein, (b) a layer of porous material of a cation exchange resin with minimum permeability, and (c) a layer of a cation exchanger having an alkali resistant polymer having no ion exchange groups embedded therein.

569219

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