Chemistry: electrical and wave energy – Processes and products
Patent
1976-10-04
1978-05-16
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204128, 204296, C25B 116, C25B 126, C25B 1308
Patent
active
040897591
ABSTRACT:
Membranes for use in chlor-alkali cells, made of a copolymer of tetrafluoroethylene and sulfonylfluoride perfluorovinyl ether, have their selectivity improved, with resulting substantial decrease in consumption of electric power per mole of sodium hydroxide produced, by being heat-treated at 100 to 275.degree. Centigrade for several hours to four minutes. The current efficiency is substantially increased, and the power consumption, per unit of sodium hydroxide produced, is usually decreased by about 10 percent or more.
REFERENCES:
patent: 3257334 (1966-06-01), Chen
patent: 3282875 (1966-11-01), Connolly et al.
patent: 3948737 (1976-04-01), Cook et al.
patent: 3969285 (1976-07-01), Grot
patent: 4026783 (1977-05-01), Grot
"Nafion", An Electrochemical Traffic Controller, by D. J. Vaughan, DuPont Innovation, vol. 4, No. 3, Spring 1973.
"XR Perfluorosulfonic Acid Membranes" E. I. Dupont, Oct. 1, 1969.
Hirozawa Stanley Tariho
Krumpelt Michael
Andrews R. L.
BASF Wyandotte Corporation
Dunn Robert E.
Linkhauer John W.
Swick Bernhard R.
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