Addition of severely-hindered amine salts and/or aminoacids to non-hindered amine solutions for the absorption of H2S

摘要

A new alkaline absorbent solution containing the additive of a severely-hindered amine salt and/or a severely-hindered aminoacid to a non-hindered amine such as N-methyldiethanolamine (MDEA) is provided. A process for the removal of H2S from fluid mixtures using this absorbent solution to produce a very low level of H2S in the treated fluid is also provided. The process is also suitable for the selective removal of H2S from fluid mixtures comprising H2S and CO2. Use of the above absorbent solution leads to higher selectivity for H2S than observed when MDEA is used alone without the additives.