Brine systems for chlor-alkali membrane cells

Details Brine systems for chlor-alkali membrane cells Brine systems for chlor-alkali membrane cells

C - Chemistry, Metallurgy

25

B

204/156, 204/64

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

Patent

CA 1235382

ABSTRACT A brine system for use in electrolyzing salt to chlorine, caustic soda and hydrogen in chlor-alkali cells employing an ion exchange membrane and, more particularly, for the efficient use of brine as a raw material to be electrolyzed in chlor-alkali membrane cells; a diaphragm cell and evaporator plant is converted to one empolying membrane type cells while still utilizing the existing brine treat- ment and caustic evaporation equipment and the resultant plant installations; the brine is subjected to a brine purification pretreatment to remove impurities sufficient to make a satisfactory brine feed for electrolysis in chlor- alkali membrane cells; the purified brine is concentrated to a slurry containing up to about 30% NaCl solids, and depleted salt solution from an anode compartment of the membrane cells is combined with the slurry to produce the cell brine feed.

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