SEPARATION OF HYDROGEN SULFIDE FROM NATURAL GAS

摘要

A process for increasing the selectivity of an alkanolamine absorption process for selectively removing hydrogen sulfide (H2S) from a gas mixture which also contains carbon dioxide (CO2) and possibly other acidic gases such as COS, HCN, CS2 and sulfur derivatives of C1 to C4 hydrocarbons, comprises contacting the gas mixture with a liquid absorbent which is a severely sterically hindered capped alkanolamine. The improvement in selectivity is achieved at the high(er) pressures, typically least about 10 bara at conditions nearing the H2S/CO2 equilibrium at which CO2 begins to displace absorbed hydrosulfide species from the absorbent solution.

主权项

1. A cyclic separation process for selectively separating hydrogen sulfide (H2S) from a gas mixture which also comprises carbon dioxide (CO2), which process comprises:
contacting a stream of the gas mixture with a solution of a capped alkanolamine H2S absorbent at a pressure of at least 1 bara.