Electrolytic production of high purity alkali metal hydroxide

Details Electrolytic production of high purity alkali metal hydroxide Electrolytic production of high purity alkali metal hydroxide

1971-10-21

1977-05-24

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204128, 204258, 204296, 204290F, 204290R, 260 296F, 260 296SQ, C25B 116, C25B 126, C25B 1308

Patent

active

040254054

ABSTRACT:
Concentrated alkali metal hydroxide substantially free of alkali metal halide and other impurities is produced by the electrolysis of an alkali metal halide solution in an electrolytic cell having a dimensionally stable anode and a metal cathode separated by an electrically conductive stable selectively permeable hydrated cation ion-exchange membrane film of a fluorinated copolymer having pendant sulfonic acid groups or derivatives of such groups. The membrane film is capable of use at high temperatures and under severely corrosive chemical conditions for extended periods without degradation.

REFERENCES:
patent: 2967807 (1961-01-01), Osborne et al.
patent: 3282875 (1966-11-01), Connolly et al.
patent: 3657104 (1972-04-01), Hodgdon
patent: 3663414 (1972-05-01), Martinsons et al.
patent: 3684543 (1972-08-01), De Nora et al.
patent: 3694281 (1972-09-01), Leduc
patent: 3718551 (1973-02-01), Martinsons
"XR Perfluorosulfonic Acid Membranes," New Product Info. from R and D Division - Plastics Dept., 10-1-69.

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