C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/13, 18/32
C08J 5/22 (2006.01)
Patent
CA 1120218
ABSTRACT OF THE DISCLOSURE Characteristics of a cation exchange membrane used for the electrolysis of an alkali metal chloride are recovered by immersing the perfluorocarbon type cation exchange membrane in an organic solvent having water miscibility and a boiling point of higher than 120°C at 760 mmHg; holding the immersed membrane between a pair of smooth plates and heating at a temperature from 40°C to 180°C; treating the heat-treated membrane in hydrochloric acid and then, immersing the membrane in an aqueous solution of sodium hydroxide. The organic solvent is preferably ethylene- glycol, propyleneglycol, isopropyleneglycol,butanediol, pentane- diol, hexanodiol, glycerin or polyethyleneglycol.
325794
Asami Shunichi
Seita Toru
Shimizu Akihiko
Marks & Clerk
Toyo Soda Manufacturing Co. Ltd.
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