MEMBRANE PROCESS FOR H2 RECOVERY FROM SULFUR RECOVERY TAIL GAS STREAM OF SULFUR RECOVERY UNITS AND PROCESS FOR ENVIRONMENTALLY GREENER SALES GAS

摘要

Methods and systems are provided for treating the tail gas stream of a sulfur recovery plant. The methods including generating a tail gas stream from a sulfur recovery plant, treating the tail gas stream with a hydrogen sulfide removal unit and a hydrogen selective membrane unit, generating a stream low in hydrogen sulfide and a stream rich in hydrogen. The hydrogen sulfide rich stream is recycled to the sulfur recovery unit. The hydrogen selective membrane unit includes a glassy polymer membrane selective for hydrogen over hydrogen sulfide and carbon dioxide.