Process of removing H2S, CO2, COS and mercaptans from gases by absorption

摘要

The process of removing H2S, CO2, COS and mercaptans from gases by absorption in an absorbent solution, which is circulated between the absorbing zone and a regenerating zone and which contains at least one organic base dissolved in methanol, has been improved. In accordance with the invention, the absorbent solution contains one or more secondary or tertiary amines general formula R1-NH-R2 or (R1)2-N-CH2-N-(R2)2, wherein R1 and R2 means CH2- or -CH2-CH3 or CH3-CH-CH3 in a total amount of at least 0.5 to 5.0 moles per liter, and the amine has or the amines have a boiling point between 40 DEG and 110 DEG C. at 1 bar. This improvement permits a selective removal of H2S from CO2-containing gases.