Two-stage flotation purification of NaOH

Details Two-stage flotation purification of NaOH Two-stage flotation purification of NaOH

1979-06-14

1981-06-16

Cuchlinski, Jr., William A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

209 11, 209164, 210737, B03D 102

Patent

active

042736579

ABSTRACT:
A process for purifying an aqueous solution of NaOH by removing suspended NaCl and Na.sub.2 SO.sub.4 impurities therefrom comprising bubbling a gas into the impurity-containing NaOH solution at a first stage temperature above 16.degree. C. up to 31.degree. C. and at a second stage temperature above 31.degree. C. up to about 36.degree. C., separating a foam layer containing NaCl and Na.sub.2 SO.sub.4 from NaOH at the first stage and a foam layer containing Na.sub.2 SO.sub.4 from NaOH at the second stage.

REFERENCES:
patent: 1430182 (1922-09-01), Peck
patent: 2983377 (1961-05-01), Singleton
patent: 3772190 (1973-11-01), Eisenmann
patent: 3784468 (1974-01-01), Garcia
patent: 4065270 (1977-12-01), Nakaya et al.
Hubel et al., "Removal of Salt from Caustic Soda Produced by Diaphragm Cells," Canadian Chemistry and Metallurgy, p. 52, Mar. 1933.

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