Improved sulfur recovery process for treating low to medium mole percent hydrogen sulfide gas feed containing BTEX in a Claus unit

摘要

A concentration apparatus and method are provided for concentrating the hydrogen sulfide concentration in the acid gas fluid (10) to produce a hydrogen sulfide enriched fluid for supply to a Claus unit. The concentrator is operable to separate the acidic gas fluid into a hydrocarbon enriched fluid (14) and a purified acidic gas fluid (12), wherein the acidic gas fluid removes hydrogen sulfide, carbon dioxide, and hydrocarbons. Comprising a hydrocarbon selective separation unit (102) and a purified acid gas fluid (12), and operable to produce a hydrogen sulfide enriched fluid (18) and a hydrogen sulfide lean fluid (16); A hydrogen sulfide selective separation unit (106) in which the hydrogen sulfide enriched fluid (18) has a hydrogen sulfide concentration and a Claus unit (200) operable to recover sulfur (80) from the hydrogen sulfide enriched fluid (18). ). The concentrator may include a carbon dioxide selective separation unit (108) that is in fluid communication with the hydrogen sulfide selective separation unit (106) and is operable to separate the hydrogen sulfide enriched fluid (18). .