Double crystallization process to produce low organic, low silic

Details Double crystallization process to produce low organic, low silic Double crystallization process to produce low organic, low silic

1980-06-27

1981-09-01

Bernstein, Hiram

Chemistry: physical processes

Physical processes

Crystallization

23301, 23302T, C30B 902

Patent

active

042869676

ABSTRACT:
A process for the production of low organic, low silica, anhydrous sodium carbonate comprising (a) calcining raw trona ore to produce crude sodium carbonate containing soluble and insoluble impurities, (b) admixing said crude sodium carbonate with a substantially saturated sodium carbonate solution to produce sodium carbonate monohydrate crystals containing insolubles and an impure sodium carbonate solution; (c) separating these monohydrate crystals and impurities; (d) dissolving the monohydrate crystals to produce a substantially saturated sodium carbonate solution and insolubles; (e) separating said solution from the insolubles; (f) evaporative crystallization of the separated saturated sodium carbonate solution to produce pure sodium carbonate monohydrate crystals; (g) optionally, subjecting the crystals recovered in step (f) to steps (d-f) once, but no more than once; (h) heating said monohydrate crystals to obtain low organic, low silica, anhydrous sodium carbonate product particles; and (i) optionally, repeating the sequence defined by steps (b-h) once, but no more than once is disclosed.

REFERENCES:
patent: 3838189 (1974-09-01), Sopchak et al.
patent: 3904733 (1975-09-01), Gancy et al.
patent: 4158043 (1979-06-01), Gloster

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