| 摘要 |
Hydrogen sulphide and carbonyl sulphide are removed from a gas stream obtained by the gasification of coal or heavy hydrocarbon and containing inter alia hydrogen, carbon monoxide, carbon dioxide, hydrogen sulphide and carbonyl sulphide by a process which comprises washing the gas stream with an absorbent in a first absorbtion stage (100) to remove almost all of the hydrogen sulphide in said gas stream; reacting the gas leaving the first absorbtion stage (100) with water vapour in a shift converter system (15) utilizing a sulphur resistant shift catalyst to convert at least part of the carbon monoxide into hydrogen and to hydrolyze the carbonyl sulphide to hydrogen sulphide; and washing the remaining gas with absorbent in a second absorbtion stage (24) to remove substantially all of the hydrogen sulphide remaining. |
