Production of high purity calcium thiosulfate

Details Production of high purity calcium thiosulfate Production of high purity calcium thiosulfate

1977-10-25

1978-08-08

Cooper, Jack

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423357, C01B 1764

Patent

active

041057546

ABSTRACT:
A process for the production of high purity calcium thiosulfate by a metathesis reaction of ammonium thiosulfate and calcium hydroxide or calcium oxide is disclosed. Aqueous solutions of high purity calcium thiosulfate, in concentrations up to about 30% by weight, are prepared by removing substantially all of the co-product ammonia under conditions which minimize the decomposition of the thiosulfate ion. Heating the reaction mixture to a temperature of about the boiling point at atmospheric pressure is used to prepare aqueous solution of about 10% by weight calcium thiosulfate, and lower reaction temperatures are employed to prepare more concentrated aqueous solutions of calcium thiosulfate up to about 30% by weight, which is the saturation point.

REFERENCES:
patent: 2041397 (1936-05-01), Butterworth et al.
patent: 2198642 (1940-04-01), Vokennel et al.

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