Method for producing an alkali metal hydroxide

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

1989-02-03

1991-08-13

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204296, C25B 116

Patent

active

050393820

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 .mu.m selected from the group consisting of the following (a), (b), and (c), and a second layer of a perfluorocarbon polymer having --CO.sub.2 M 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 thicknesss of at least 5 .mu.m, is disposed with the first layer facing the cathode compartment;

REFERENCES:
patent: 4297196 (1981-10-01), Lazarz et al.
patent: 4402806 (1983-09-01), Coker
patent: 4426271 (1984-01-01), Yoshida et al.
patent: 4455210 (1984-09-01), Coker et al.
patent: 4686120 (1987-08-01), Johnson
patent: 4720334 (1988-01-01), DuBois et al.
Official Action, May 29, 1989 Application Number: 4613509/26 (021991), Filing Date Feb. 10, 1989, Asahi Glass Company Ltd., JP Koji Suzuki et al., Method for Producing Alkali Metal Hydroxide.

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