Method of obtaining caustic soda from a sodium chloride liquor c

Details Method of obtaining caustic soda from a sodium chloride liquor c Method of obtaining caustic soda from a sodium chloride liquor c

1976-03-25

1978-05-02

Emery, Stephen J.

Chemistry: physical processes

Physical processes

Crystallization

23299, 23302T, 23303, 423499, 423183, 423641, 423551, 159 47WL, B01d 902, C01d 104

Patent

active

040872530

ABSTRACT:
A method of obtaining caustic soda and pure sodium chloride from an electrolytic cell liquor containing also sulfate ions including the steps of concentrating the liquor through multiple effect evaporation, cooling the concentrate obtained, separating the sodium chloride and the salt containing sulfate and recovering the caustic soda, whereby during a first stage the liquor is evaporated so as to precipitate only sodium chloride which is removed, in a second stage a solid phase is formed of sodium chloride, sodium sulfate and triple salt of caustic soda, sodium chloride and sodium sulfate, with said solid phase being contacted with a caustic soda solution of less than about 35% by weight concentration, so as to decompose said triple salt, removing the salt containing sulfate, and in a third stage the solution from the second stage is cooled to precipitate said triple salt of caustic soda, sodium chloride and sodium sulfate, which is separated from the caustic soda which does not crystallize and is removed from the system, and the resulting solid phase which remains is collected and is recycled into the initial electrolytic cell liquor.

REFERENCES:
patent: 2753242 (1956-07-01), Davis
patent: 3332470 (1967-07-01), Chirico et al.
patent: 3362457 (1968-01-01), Chirico
patent: 3712797 (1973-01-01), Winkler
patent: 3854299 (1974-12-01), Myers et al.

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