Patent ID: 7927576
Filing Date: 2011-04-19
Classification: C01B,Y02P

Abstract:
1. A process for continuous production of a concentrated solution of ammonium thiosulfate (ATS) comprising the steps of: (a) contacting an SO (b) contacting an H (c) recycling the sulfite rich ATS solution produced in Step (a) to contact the H (d) stopping the recycling in Step (c) to cause the re-circulating liquid stream of ATS solution in Step (a) to convert to an ABS solution, and contacting the SO (e) contacting the sulfite rich ABS solution produced in Step (d) with the re-circulating liquid stream of ATS solution in Step (b); and (f) removing the ATS solution produced in Steps (a), (b) and/or (c) to obtain a concentrated solution of ATS having optimum sulfite concentration and pH.