Method of deacidizing a gas by means of an absorbent solution with fractionated regeneration through heating

A method of deacidizing a gaseous effluent comprising at least one acid compound of the group made up of hydrogen sulfide (H2S), carbon dioxide (CO2), wherein the following stages are carried out:

• a) contacting the gaseous effluent with an absorbent solution so as to obtain a gaseous effluent depleted in acid compounds and an absorbent solution laden with acid compounds, the absorbent solution being selected for its property of forming two separable liquid phases when it has absorbed an amount of acid compounds and when it is heated,
• b) heating the absorbent solution laden with acid compounds so that the absorbent solution divides into two liquid fractions:
• a first absorbent solution fraction depleted in acid compounds and a second absorbent solution fraction enriched in acid compounds,
• c) separating said two fractions obtained in stage b),
• d) regenerating the second fraction so as to release part of the acid compounds,
• e) recycling the first absorbent solution fraction and the regenerated absorbent solution as absorbent solution to stage a).