Process for production of ammonium thiosulphate

Details Process for production of ammonium thiosulphate Process for production of ammonium thiosulphate

1999-01-07

2000-12-12

Langel, Wayne

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423519, C01B 1762, C01B 1764

Patent

active

061594407

ABSTRACT:
A process for continuous production of ammonium thiosulphate from H.sub.2 S, SO.sub.2, and NH.sub.3 comprising steps of producing in a first absorption step a solution of ammonium hydrogen sulphite by contacting a first gas stream comprising S0.sub.2 with NH.sub.3 and an aqueous solution comprising ammonium hydrogen sulphite in one or more absorbers connected in series and withdrawing a vent gas from one of the absorbers, passing the solution produced in the first absorption step to a second absorption step in which a second gas stream comprising H.sub.2 S is contacted with NH.sub.3 and an aqueous solution of ammonium thiosulphate thereby producing a solution being rich in ammonium thiosulphate.

REFERENCES:
patent: 2412607 (1946-12-01), Farr et al.
patent: 3431070 (1969-03-01), Keller
patent: 3473891 (1969-10-01), Mack
patent: 3524724 (1970-08-01), Every et al.
patent: 4478807 (1984-10-01), Ott
"Thiosulfates", Kirk-Othmer Encyclopedia of Chemical Technology, 4th edition, 1997, vol. 24, pp. 60-63.

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