Manufacture of calcium sulphate alpha hemihydrate

Details Manufacture of calcium sulphate alpha hemihydrate Manufacture of calcium sulphate alpha hemihydrate

1975-04-22

1978-10-17

Dean, R.

Compositions: coating or plastic

Coating or plastic compositions

Proteinaceous material containing

106110, 423163, 423166, 423170, 423555, C04B 1100

Patent

active

041207378

ABSTRACT:
A process for the manufacture of calcium sulphate alpha-hemihydrate which comprises the step of interacting an aqueous solution of calcium chloride and a source of sulphate or bisulphate ions in an aqueous system at a temperature above the calcium sulphate hemihydrate/gypsum transition temperature under the reaction conditions. The preferred reagents are the waste calcium chloride/sodium chloride effluent of the ammonia soda process and sulphuric acid (e.g. impure sulphuric acid effluent) to give hydrochloric acid as a co-product. The preferred reaction temperature is at least 20.degree. C. above the transition temperature (about 70.degree. C), e.g. at 95.degree.-100.degree. C at atmospheric pressure.

REFERENCES:
patent: 601006 (1898-03-01), Sturcke
patent: 2413799 (1947-01-01), Sullivan
patent: 3302997 (1967-02-01), Heuer
"Manufacture of Soda, with Special Reference to the Ammonia Process", Te-Pong How, American Chemical Society Monograph Series, Reinhold Publishing Corp., N.Y., N.Y., 1942, pp. 253-254.

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