Method for electrolyzing aqueous solution of alkali chloride

Details Method for electrolyzing aqueous solution of alkali chloride Method for electrolyzing aqueous solution of alkali chloride

1993-12-07

1995-11-14

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204103, 204129, 204128, C25B 146

Patent

active

054663474

ABSTRACT:
The present invention is intended to prevent the formation of impurities such as chlorate in electrolysis using the ion exchange membrane method, without resorting to the addition of hydrochloric acid to counter the migration of alkali hydroxide from the cathode compartment to the anode compartment. The method of the present invention includes feeding a portion of an aqueous solution of an alkali chloride (as the raw material) into an auxiliary electrolytic cell of the cation exchange membrane type in which the anode is a hydrogen gas electrode, thereby effecting electrolysis to generate hydrochloric acid in the anode compartment, and then feeding the hydrochloric acid-containing aqueous solution of alkali chloride into the main electrolytic cell, thereby neutralizing the alkali hydroxide which migrates from the cathode compartment. This method inherently forms hydrochloric acid in the system, obviating the need for having an additional facility for synthesis of hydrochloric acid, thus permitting the efficient production of alkali hydroxide and chlorine without the addition of hydrochloric acid.

REFERENCES:
patent: 3963592 (1976-06-01), Lindstrom
patent: 4217186 (1980-08-01), McRae
patent: 4391680 (1983-07-01), Mani et al.
patent: 5041197 (1991-08-01), Gelb

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