Patent ID: 6645272
Filing Date: 2003-11-11
Classification: B01D,C10L

Abstract:
A process for treating a gas containing acid gases, wherein:(a) at least a fraction of the gas is contacted with a methanol-containing aqueous phase, the gas being thus charged with methanol at the end of stage (a), (b) the gas from stage (a) is contacted, in an absorption column, with a mixture of solvents comprising methanol, water and a solvent heavier than methanol, the gas flowing from the top of said absorption column being thus at least partly freed from the acid gases it contains at the beginning the process prior to stage (a), the mixture of solvents flowing out at the bottom of said absorption column being charged with acid gases, (c) the mixture of solvents from stage (b) is at least partly regenerated through pressure reduction and/or heating by releasing at least partly the acid gases, the at least partly regenerated mixture of solvents being recycled to stage (b) at the end of stage (c), and (d) the gas from stage (b) is cooled by producing at least a methanol-containing aqueous phase which is at least partly recycled to stage (a), said process being characterized in that, in stage (b), the mixture of solvents flowing out at the bottom of said absorption column is cooled, then reintroduced at a higher level of said absorption column, so as to control the temperature in said absorption column.