Patent ID: 7655205
Filing Date: 2010-02-02
Classification: B01D,C10K,Y10S

Abstract:
1. A process for the removal of sulfur from a first gas stream comprising SO 2 , HCN and H 2 S, which said process comprises the steps of: (a) removing SO (b) removing HCN from the second gas stream obtained in step (a) by contacting the second gas stream in a hydrolysis zone with a hydrolysis catalyst in the presence of water to convert HCN to ammonia and to obtain a third gas stream comprising NH (c) removing NH (d) removing H (e) contacting the hydrogensulphide-comprising aqueous stream obtained in step (d) with sulphide-oxidizing bacteria in the presence of oxygen in an oxidation reactor to obtain a sulphur slurry and a regenerated aqueous alkaline washing liquid; (f) separating at least part of the sulphur slurry obtained in step (e) from the regenerated aqueous alkaline washing liquid and; (g) recycling the regenerated aqueous alkaline washing liquid obtained in step (e) as the aqueous alkaline washing liquid to the H