Removal of chlorate from electrolyte cell brine

Details Removal of chlorate from electrolyte cell brine Removal of chlorate from electrolyte cell brine

1982-07-06

1984-11-06

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204128, C25B 116

Patent

active

044810881

ABSTRACT:
A process for removing chlorate ions from a recirculating anolyte brine as typically used in membrane chlor-alkali cells is disclosed. In this, a portion of the circulating brine after dechlorination and resaturation with additional alkali metal chloride is diverted and treated with a stoichiometric amount of hydrochloric acid to convert substantially all of the chlorate to chlorine gas and chloride ion. When performed in this manner, substantially lower quantities of acid are required as compared to prior art processes and the problems with the generation of ClO.sub.2 are minimized.

REFERENCES:
patent: 3920529 (1975-11-01), Sprague
patent: 3970528 (1976-07-01), Zirngiebl et al.
patent: 4169773 (1979-10-01), Lai et al.
patent: 4247375 (1981-01-01), Lohrberg
patent: 4272338 (1981-06-01), Lynch et al.
Dotson, Ronald L., "Kinetics and Mechanism for the Thermal Decomposition of Chlorate Ions in Brine Acidified with Hydrochloric Acid", J. Appl. Chem. Biotechnol., 1975, 25, pp. 461-464.

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