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

25

B

161/33, 204/57.4

C25B 1/46 (2006.01) C01D 3/14 (2006.01) C25B 15/08 (2006.01)

Patent

CA 2029689

This invention relates to methods and systems for purifying brine for electrolysis in chloralkali cells, especially membrane cells by reducing the sulfate ion concentration, while at the same time minimizing the concentration of other undesirable 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.

La présente invention porte sur des méthodes et des systèmes de purification de la saumure pour l'électrolyse dans des cellules de chlore-alcalis, particulièrement dans les cellules à membrane; on réduit la concentration d'ion sulfate tout en réduisant au minimum la concentration d'autres ions indésirables, comme ceux de calcium et de chlorate. Les méthodes et les systèmes employés sont des combinaisons spéciales de réfrigération et de cristallisation, associées à des techniques de recirculation de la saumure dans les systèmes pour l'électrolyse de ladite saumure.

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