Chemistry: physical processes – Physical processes – Crystallization
Patent
1975-08-15
1977-05-31
Emery, Stephen J.
Chemistry: physical processes
Physical processes
Crystallization
23300, 23303, 423184, 423195, 423202, 23272AH, B01D 902, C01D 306, C01D 316
Patent
active
040266761
ABSTRACT:
A process for preparing from aqueous NaCl brine containing appreciable quantities of dissolved calcium sulfate high purity dendritic salt, characterized by an exceptionally low calcium sulfate content. The process is carried out by a "feed and bleed" procedure comprising admixing an alkali metal polyphosphate with said brine to increase the supersaturation of calcium sulfate therein, feeding the brine containing this additive into an evaporating and crystallizing chamber, evaporating the brine at an elevated temperature and reduced pressure to cause crystallization of pure salt and concomitantly bleeding brine from the chamber, the rate of feed of the brine to the chamber and the rate of bleed of brine from the chamber being such as to maintain the calcium sulfate in the dissolved state and prevent its precipitation with the salt.
REFERENCES:
patent: 2097649 (1937-11-01), Solberg
patent: 2108783 (1938-02-01), Smith
patent: 2642335 (1953-06-01), May
patent: 2906599 (1959-09-01), Roland
patent: 3112175 (1963-11-01), Schultze
patent: 3148023 (1964-09-01), Ploss
patent: 3155458 (1964-11-01), Fiedelman
patent: 3682601 (1972-08-01), Fedosoff
Axelrood Jack
Emery Stephen J.
Morton-Norwich Products, Inc.
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