A process for increasing the selectivity of an alkanolamine absorption process for selectively removing hydrogen sulfide (H
2
S) from a gas mixture which also contains carbon dioxide (CO
2
) and possibly other acidic gases such as COS, HCN, CS
2
and sulfur derivatives of C
1
to C
4
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 H
2
S/CO
2
equilibrium at which CO
2
begins to displace absorbed hydrosulfide species from the absorbent solution.
一种增加烷基醇胺吸收过程的选择性的方法,以有选择地从气体混合物中去除
硫化氢(
H2S),该混合物还包含
二氧化碳(
CO2)和可能包含其他酸性气体,如COS、HCN、CS2和C1至C4烃的
硫衍
生物,包括将气体混合物与一种液体吸收剂接触,该吸收剂是一种严重的立体位阻末端烷基醇胺。在高压下(通常至少约10 bara)的改进选择性是在接近 / 平衡的条件下实现的,此时 开始从吸收剂溶液中置换吸收的
硫化氢物种。