Process for production of ammonium thiosulphate
Patent 6159440 Issued on December 12, 2000. Estimated Expiration Date: 
January 7, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 7, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2412607 3431070 3473891 3524724 Method for manufacture of ammonium thiosulfate from ammonia and _solid sulfur or H2 S rich gas stream and/or both solid sulfur _and H2 S gas streams Patent #: 4478807 InventorAssigneeApplicationNo. 227058 filed on 01/07/1999US Classes:423/514, Thiosulfate423/519BisulfiteExaminersPrimary: Langel, Wayne A.Assistant: Medina, Maribel Attorney, Agent or FirmInternational ClassesC01B 017/62C01B 017/64 Foreign Application Priority Data1998-01-09 DKAbstractA process for continuous production of ammonium thiosulphate from H2 S, SO2, and NH3 comprising steps of producing in a first absorption step a solution of ammonium hydrogen sulphite by contacting a first gas stream comprising S02 with NH3 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 H2 S is contacted with NH3 and an aqueous solution of ammonium thiosulphate thereby producing a solution being rich in ammonium thiosulphate.Other References
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