Method for improving selectivity of membranes used in...

Details Method for improving selectivity of membranes used in... Method for improving selectivity of membranes used in...

C - Chemistry, Metallurgy

25

B

17/32, 204/52.5

C25B 13/08 (2006.01) C25B 1/46 (2006.01) B29C 25/00 (1980.01)

Patent

CA 1078564

Abstract of the Disclosure Membranes for use in chlor-alkali cells, made of a copolymer of tetrafluoroethylene and sulfonylfluoride per- fluorovinyl 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° Centigrade for several hours to four minutes. Desirably, the membranes are also subjected to pressure, such as up to 9.76 kilograms per square centimeter (10 tons per square foot). The current efficiency is sub- stantially increased, and the power consumption, per unit of sodium hydroxide produced, is usually decreased by about 10 percent or more. -1-

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