Purification of chlor-alkali membrane cell brine

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

1989-11-16

1991-07-02

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204128, 423499, 423551, 23297, 23298, 23302T, C25B 2500

Patent

active

050283022

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 crystallization, and brine recirculation techniques in the systems for electrolyzing brine.

REFERENCES:
patent: 1435727 (1922-11-01), Morse
patent: 4556463 (1985-12-01), Minz et al.
patent: 4565612 (1986-01-01), Fry
patent: 4586993 (1986-05-01), O'Brien
patent: 4747917 (1988-05-01), Reynolds et al.
O'Brien, T. F. Control of Sulfates in Membrane Systems, pp. 326-349.

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