Patent ID: 6280698
Filing Date: 2001-08-28
Classification: B01D,C01B

Abstract:
A method for processing a gas containing at least hydrogen sulfide (H.sub.2 S) and at least sulfur dioxide (SO.sub.2), comprising the following steps:contacting the gas with a liquid solvent containing at least one catalyst in a contacting stage;recovering gaseous effluent substantially containing no hydrogen sulfide and no sulfur dioxide from the contacting stage;separating liquid sulfur from liquid solvent in a decantation zone connected to the contacting stage;extracting a liquid fraction F containing at least solvent, catalyst, sulfur and solid by-products resulting from degradation of the catalyst from the contacting stage;sending the liquid fraction F to a processing stage distinct from the contacting stage;processing the liquid fraction F in the processing stage by heating the liquid fraction F to a temperature sufficient to at least partially crystallize the by-products, and separating the at least partially crystallized by-products from the rest of the liquid fraction F containing at least solvent; andrecovering at least a stream F.sub.1 comprising solvent, catalyst and sulfur and substantially free of the by-products and a stream F.sub.2 mostly comprising the by-products.