Patent ID: 7846325

Claim:
A process for the removal of COS and H 2 S from a synthesis gas stream to very low levels, comprising: removing H 2 S from a feed synthesis gas stream, comprising H 2 S present in the range of from 500 ppbv up to 10 ppmv and COS present in the range of from 130 ppbv up to 10 ppmv, by contacting the feed synthesis gas stream with a first solid adsorbent, comprising ZnO and an inorganic support material, to obtain a first synthesis gas stream, comprising a reduced H 2 S concentration of up to 500 ppbv; converting COS in the first synthesis gas stream to H 2 S by contacting the first synthesis gas stream with a COS-hydrolysing catalyst, comprising titania, in the presence of water in a hydrolysis zone to obtain a second synthesis gas stream depleted of COS and enriched in H 2 S; and removing H 2 S from the second synthesis gas stream by contacting the second synthesis gas stream with a second solid adsorbent, comprising ZnO and an inorganic support material, in an H 2 S removal zone to obtain a third synthesis gas stream depleted of H 2 S and depleted of COS, wherein said third synthesis gas stream contains 5 ppbv or less H 2 S and 5 ppbv or less COS.