Process for purifying sodium hydroxide

Details Process for purifying sodium hydroxide Process for purifying sodium hydroxide

1978-04-28

1980-10-07

Bernstein, Hiram H.

Chemistry: physical processes

Physical processes

Crystallization

23302T, 209165, 423179, 423641, B01D 902

Patent

active

RE0304115

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: 2699377 (1955-01-01), Dancy
patent: 3477829 (1969-11-01), Dockendorf et al.
patent: 3479281 (1969-11-01), Kikindai
patent: 3551897 (1970-12-01), Cooper
patent: 3701421 (1972-10-01), Maxwell
patent: 3799749 (1974-03-01), Moyer et al.
patent: 3854299 (1974-12-01), Myers et al.
patent: 3922154 (1975-11-01), Kawasaki et al.
Hightoner, "The Trona Process . . . and its Unique Features", Chemical Engineering, pp. 104-106, (Aug. 1951).

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