초록

An improved Claus tail gas recovery process involving stoichiometric combustion of a hydrocarbon gas when the hydrocarbon gas composition is not constant.

대표청구항 ▼

In a process for reducing the sulfur content of a Claus tail gas stream involving (1) combining the tail gas stream with a hydrogen source in an amount at least equal to the stoichiometric amount required to convert the sulfur content to hydrogen sulfide, (2) raising the temperature of the combined

In a process for reducing the sulfur content of a Claus tail gas stream involving (1) combining the tail gas stream with a hydrogen source in an amount at least equal to the stoichiometric amount required to convert the sulfur content to hydrogen sulfide, (2) raising the temperature of the combined stream to hydrogenation temperature by combusting an amount of hydrocarbon gas and oxygen-containing gas to provide hot gaseous combustion products and mixing the hot combustion products with the combined stream, (3) introducing the heated mixture to a catalytic reaction zone to convert substantially all of the sulfur content to hydrogen sulfide, and (4) treatiNg the hydrogenated gas stream to remove hydrogen sulfide; the improvement comprising adjusting the amount of oxygen-containing gas in response to changes in hydrocarbon gas specific gravity to maintain substantially stoichiometric combustion.