Purification of chlor-alkali membrane cell brine

Details Purification of chlor-alkali membrane cell brine Purification of chlor-alkali membrane cell brine

1991-02-15

1992-06-30

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204128, 423182, 423463, 423499, 423551, 23298, 23302R, 23302T, C25B 116

Patent

active

051260190

ABSTRACT:
This invention relates to methods and systems for purifying brine for electrolysis in chlor-alkali cells, especially membrane cells by reducing the sulfate ion concentration, while at the same time minimizing the concentration of other undesireable ions such as calcium and chlorate. The methods and systems employed are unique combinations of refrigeration and crystalization, and brine recirculation techniques in the systems for electrolyzing brine.

REFERENCES:
EPO Search Report, Feb. 21, 1991, in EPO SN 901199321 and Abstract.
Research Disclosure, An. May 1988, #28925.
Crystallization of Sodium Sulfate from Brines Formed After DiSalination of Mine Water, Maksin et al., Khim Tekhnulvodx (1979 both Russian Language & English Translation.
Japanese Patent Publ. 56-32252, (1979), Tsurumi Soda Co. both Japanses Language & English Translation.

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