Patent ID: 7635408

Claim:
A plant comprising: a first absorber fluidly coupled to a regenerator, wherein the first absorber is configured to promote absorption of hydrogen sulfide by a hydrogen sulfide-selective solvent, and wherein the regenerator is configured to promote formation of a hydrogen sulfide-rich gas from the hydrogen sulfide-selective solvent; a second absorber fluidly coupled to the regenerator, wherein a portion of the hydrogen sulfide-rich gas is fed to the second absorber to thereby increase a hydrogen sulfide concentration in the hydrogen sulfide-rich gas; wherein the first and second absorbers are configured to produce an overhead product that is enriched in carbon dioxide and substantially depleted in hydrogen sulfide; wherein another portion of the hydrogen sulfide-rich gas is fed to a Claus plant, and further comprising a third absorber that receives a tail gas from the Claus plant, wherein the third absorber is configured to promote absorption of hydrogen sulfide by a hydrogen sulfide-selective solvent; and wherein the third absorber is configured to produce an overhead product that is enriched in carbon dioxide and substantially depleted in hydrogen sulfide.