METHOD FOR THE SELECTIVE ABSORPTION OF HYDROGEN SULPHIDE FROM A GASEOUS EFFLUENT COMPRISING CARBON DIOXIDE BY AN AMINE ABSORBENT SOLUTION COMPRISING A VISCOSIFYING AGENT

摘要

The invention is a method for selectively removing hydrogen sulfide H2S from a gaseous effluent comprising at least H2S and CO2. A stage of selective absorption of the hydrogen sulfide in relation to the CO2 is carried out by contacting the effluent with a solution comprising (a) water and (b) at least one nitrogen compound. The compound comprises at least one tertiary amine function or one hindered secondary amine function. The absorption selectivity is controlled by adding (c) a viscosifying compound to the absorbent solution.