PROCESS FOR PRODUCING A PURIFIED GAS STREAM

摘要

A process for producing a purified gas stream from a feed gas stream comprising contaminants, the process comprising the steps of: (a) removing contaminants from the feed gas stream to obtain the purified gas stream and a sour gas stream comprising H<SUB>2</SUB>S and RSH; (b) separating the sour gas stream comprising H<SUB>2</SUB>S and RSH into a gas stream enriched in H<SUB>2</SUB>S and a residual gas stream comprising RSH; (c) converting H<SUB>2</SUB>S in the gas stream enriched in H<SUB>2</SUB>S to elemental sulphur in a Claus unit, thereby obtaining a first off-gas stream comprising SO<SUB>2</SUB>; (d) converting SO<SUB>2</SUB> in the first off-gas stream comprising SO<SUB>2</SUB> to H<SUB>2</SUB>S in a Claus off-gas treating reactor to obtain a second off-gas stream comprising H<SUB>2</SUB>S; (e) converting RSH from the residual gas stream comprising RSH to H<SUB>2</SUB>S in an RSH conversion reactor to obtain a residual gas stream comprising H<SUB>2</SUB>S, wherein at least one of the operating conditions of the RSH conversion reactor is different from the corresponding operating condition of the Claus off-gas treating reactor.