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Title: Process for the continuous manufacture of crystallized ammonium thiosulfate

Abstract: Crystallized ammonium thiosulfate is manufactured by converting ammonia with oxygen containing sulfur dioxide in ammonium thiosulfate solution to ammonium bisulfite and ammonium sulfite in a first step, while maintaining a pH of from 5.5 to 7.0 and a reaction temperature of up to 80.degree.C. In a second step, the ammonium bisulfite and ammonium sulfite in the solution are converted with ammonia and sulfur to ammonium thiosulfate.


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Inventors: Metzger, Adolf (Wiesbaden, DT)
Henke, Karl-Heinz (Frankfurt am Main, DT)
Schreiber, Horst (Taunus, DT)

Application Number: 370686
Filing Date: 1973-06-18
Publication_date: 1976-02-10
Assignee: Hoechst Aktiengesellschaft (Frankfurt am Main, DT)
Primary Class(es): 423/514 423/519
Other Classes:
US Patent Ref:
2219258Oct, 1940Hill423/514.
3431070Mar, 1969Keller423/514.
3473891Oct, 1969Mack423/514.

Other Refs:
Primary Examiner: Thomas, Earl C.
Assistant Examiner:
Attorney: Curtis, Morris & Safford