Patent ID: 7018450
Filing Date: 2006-03-28
Classification: B01D,C10L

Abstract:
1. A method of deacidizing a natural gas containing acid gases wherein the following stages are carried out: (a) contacting the natural gas with a first solvent containing methanol, water and an amine, obtained in stage e), and with a third solvent containing acid gases obtained in stage b) so as to obtain a methanol-containing gas and an acid gas-containing solvent, (b) contacting the gas obtained in stage a) with a second solvent containing methanol, water and an amine, obtained in stage d), so as to obtain a gas partly freed of acid gases and the third solvent containing acid gas, (c) expanding the acid gas-containing solvent obtained in stage a) so as to release acid gases and to obtain a partly regenerated solvent, (d) distilling in a distillation column a first fraction of the partly regenerated solvent obtained in stage c) so as to obtain a gas phase containing acid gases and the second solvent, (e) mixing a second fraction of the partly regenerated solvent obtained in stage c) with a fourth solvent drawn off at a point of the distillation column located between the bottom and the top of the distillation column so as to obtain the first solvent, the draw-off point being determined for the proportion by mole of methanol of the first solvent to be higher than that of the second solvent.