Electrolyzing dilute caustic soda solution with sequential...

Details Electrolyzing dilute caustic soda solution with sequential... Electrolyzing dilute caustic soda solution with sequential...

C - Chemistry, Metallurgy

25

B

204/64

C25B 1/16 (2006.01) C25B 1/46 (2006.01) C25B 15/00 (2006.01)

Patent

CA 1258820

ELECTROLYZING DILUTE CAUSTIC SODA SOLUTION WITH SEQUENTIAL POLARITY INVERSION ABSTRACT OF THE DISCLOSURE The application relates to an electrolysis method comprising supplying and electrolyzing a dilute caustic alkali aqueous solution in one electrode compartment of an electrolytic cell partitioned by a cation exchange membrane and recovering a concentrated caustic alkali aqueous solution from the other electrode compartment, wherein at least one of iron or nickel, or alloys based on them, is used as -the electrode material and the electrolysis is conducted for a certain period of time such that an electric current is applied in a positive direction with the polarity being inverted after every electrolysis step.

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