Purification of chlor-alkali membrane cell brine

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

C - Chemistry, Metallurgy

01

D

23/100, 161/38,

C01D 3/14 (2006.01) C01D 3/06 (2006.01) C25B 1/34 (2006.01) C25B 15/08 (2006.01)

Patent

CA 2039881

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.

La présente invention concerne des méthodes et systèmes pour purifier la saumure pour l'électrolyse dans les cellules de chlore alcali, surtout des cellules à membrane par la réduction de la concentration des ions sulfate, tout en réduisant le plus possible la concentration d'autres ions indésirables comme les ions calcium et chlorate. Les méthodes et systèmes employés sont des combinaisons uniques de réfrigération et de cristallisation, et de techniques de recirculation de la saumure dans les systèmes d'électrolyse de la saumure.

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