Patent ID: 8475570

Claim:
A process for producing a purified gas from a feed gas comprising H 2 S, CO 2 and a contaminant of either HCN or COS, or both, the process comprising the steps of: (a) contacting the feed gas with a HCN/COS hydrolysis sorbent in the presence of water in a HCN/COS hydrolysis unit, thereby obtaining gas depleted in the contaminant; (b) contacting the gas depleted in the contaminant with an absorbing liquid in an H 2 S/CO 2 absorber to remove H 2 S and CO 2 , thereby obtaining the purified gas and an absorbing liquid rich in H 2 S and CO 2 ; (c) heating and de-pressurising at least part of the absorbing liquid rich in H 2 S and CO 2 to obtain a hot flash gas enriched in CO 2 and an absorbing liquid enriched in H 2 S; (d) contacting the absorbing liquid enriched in H 2 S at elevated temperature with a stripping gas, thereby transferring H 2 S to the stripping gas to obtain a regenerated absorbing liquid and a stripping gas rich in H 2 S; and (e) leading at least part of the hot flash gas enriched in CO 2 to the HCN/COS hydrolysis unit.