A method for removing hydrogen sulfide to produce elemental sulfur from a
synthesis gas feed stream containing hydrogen sulfide, carbon monoxide,
hydrogen, carbon dioxide and water using direct oxidation of hydrogen
sulfide by contacting a feed stream containing synthesis gas with oxygen
in the presence of a catalyst comprised of metal oxides to convert a
substantial fraction of the hydrogen sulfide present in the feed stream
into sulfur and water, followed by cooling the reaction products to a
temperature below the dew point temperature of the water and sulfur,
separating the reaction products into two streams, with the first stream
containing elemental sulfur and water in liquid form and the second
stream containing unreacted components from the synthesis gas, hydrogen
sulfide, carbon monoxide, hydrogen, carbon dioxide and water, and then
recycling a portion of the unreacted components to the feed stream.