Abstract: The gaseous effluent to be treated is contacted in C1 with an absorbent solution selected for its property of forming two separable phases when it has absorbed an amount of acid compounds and when it is heated. The absorbent solution laden with acid compounds is then heated in E1 and E3 so as to separate two fractions in BS1: a first absorbent solution fraction depleted in acid compounds and a second absorbent solution fraction enriched in acid compounds. The second fraction is regenerated in C2 so as to release part of the acid compounds, and the first absorbent solution fraction and the regenerated absorbent solution are recycled as absorbent solution. According to the invention, an absorbent solution portion circulating in C1 is cooled in E2 in order to prevent demixing of the solution in column C1.

Abstract: The CO2 contained in combustion fumes is captured by carrying out at least the following steps in combination: a) A fuel is burned, producing combustion fumes; b) The fumes are placed in contact with an absorbent solution in order to produce CO2-poor fumes and a CO2-laden solution; c) The CO2-laden solution is regenerated in a thermal regeneration column (RE) in order to produce a regenerated absorbent solution and a CO2-rich gaseous effluent (5); d) Said CO2-rich gaseous effluent is cooled in order to obtain a CO2-enriched gaseous fraction which is evacuated, and a liquid fraction which is introduced at the head of regeneration column (RE) as reflux (7); In addition, in step d), at least one of the following operations is conducted: i) Said gaseous effluent is cooled (C1) to an intermediate temperature in order to produce a liquid flow and a gaseous flow, then the gaseous flow is subcooled (C2) in order to produce said gaseous fraction and said liquid fraction, said liquid flow and said liquid frac