Method for producing an alkali metal hydroxide and electrolytic

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

1986-12-15

1990-11-13

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204252, 204283, 204296, 204128, C25B 114, C25B 1308

Patent

active

049699822

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 --SO.sub.3 M groups (wherein M is an alkali metal) with a thickness of at least 5 .mu.m, 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 thickness of at least 5 .mu.m, 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.

REFERENCES:
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patent: 4224121 (1980-09-01), Dempsey et al.
patent: 4313805 (1983-06-01), Burney et al.
patent: 4402806 (1982-02-01), Coker et al.
patent: 4426271 (1984-01-01), Yoshida et al.
patent: 4518470 (1985-05-01), Oda et al.
Patent Abstracts of Japan, vol. 6, No. 244 (C-138) [1122], 2nd, Dec. 1982; & JP--A-57 143,332.

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