| abstract |
A feed gas comprising CO 2 , H 2 S and H 2 is treated to produce an H 2 -enriched product and an H 2 S-lean, CO 2 product. The feed gas is separated to provide the H 2 -enriched product and a stream of sour gas. The stream of sour gas is divided into two parts, one of which is processed in an H 2 S removal system to form one or more streams of sweetened gas, and the other of which bypasses the H 2 S removal system, the stream(s) of sweetened gas and the sour gas bypassing the H 2 S removal system then being recombined to form the H 2 S-lean, CO 2 product gas. The division of the sour gas between being sent to and bypassing the H 2 S removal system is adjusted responsive to changes in the H 2 S content of the sour gas, so as to dampen or cancel the effects of said changes on the H 2 S content of the H 2 S-lean, CO 2 product gas. |