Process for purifying sodium hydroxide

Details Process for purifying sodium hydroxide Process for purifying sodium hydroxide

1976-04-16

1977-12-27

Yudkoff, Norman

Chemistry: physical processes

Physical processes

Crystallization

23302T, 23303, 204 98, 423179, 423641, B01D 902, C01D 130

Patent

active

040652700

ABSTRACT:
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 impurity crystals. The fine impurity crystals are adsorbed on bubbles which are formed by vaporizing a dissolved coolant or introducing a gas in the slurry and separated from the slurry.

REFERENCES:
patent: 3477829 (1969-11-01), Dockendorff et al.
patent: 3799749 (1974-03-01), Moyer et al.
patent: 3854299 (1974-12-01), Myers et al.
patent: 3922154 (1975-11-01), Kawasaki et al.
Hightower, "The Trona Process. . . and its Unique Features", Chemical Engineering, pp. 104-106, (Aug. 1951).

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