Process for purifying sodium hydroxide

Details Process for purifying sodium hydroxide Process for purifying sodium hydroxide

C - Chemistry, Metallurgy

01

D

23/276, 361/36

C01D 1/30 (2006.01)

Patent

CA 1076777

ABSTRACT OF THE DISCLOSURE An aqueous solution of sodium hydroxide containing soluble impurities such as a concentrated catholyte produced by a diaphragm electrolysis is cooled by a coolant or a heat- exchanger to form a slurry containing sodium hydroxide hydrate crystals and fine crystal impurities and the fine crystal impurities are adsorbed on bubbles which are formed by vaporizing a dissolved coolant or introducing a gas in the slurry and separated from the slurry.

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