BTEX Improved Sulfur Recovery Process for Treating Low to Medium Mole Percent Hydrogen Sulfide Gas Feeds with BTEX in a Claus Unit

摘要

A concentrator for concentrating the hydrogen sulfide concentration in the acid gas stream to produce a hydrogen sulfide rich stream for supply to the Claus. The concentrating apparatus comprising a hydrocarbon selective separation unit operable to separate the acid gas stream into a hydrocarbon-rich stream and a purified acid gas stream, wherein the acid gas stream comprises hydrogen sulfide, carbon dioxide, and hydrocarbons; A hydrogen sulfide selective separation unit operable to separate the purified acid gas stream to produce a hydrogen sulfide rich stream and a hydrogen sulfide lean stream, the hydrogen sulfide rich stream having a concentration of hydrogen sulfide; And a Claus unit operable to recover sulfur from the carbon dioxide lean stream. The concentrator may include a carbon dioxide selective separation unit in fluid communication with a hydrogen sulphide selective separation unit operable to separate the hydrogen sulfide rich stream.