Method of separating a mixture of gases by absorption

摘要

A method of separating a mixture of gases by the following stages: a) absorbing a part G2 of a gas mixture G1 by a solvent L1 in an absorption zone C1; b) expanding the solvent L1, leading to partial vaporization of the absorbed gases G2 and cooling of the solvent L1; c) desorbing the gas fraction G2 in a desorption apparatus D1 having a reboiling zone B1 and an internal heat exchange zone Z1, wherein the solvent L1 from stage (b) is circulated in countercurrent contact with the vapor phase, and simultaneously has counter-current heat exchange with the solvent phase from the reboiling zone B1; d) passing the regenerated solvent leaving the reboiling zone B1 into the heat exchange zone Z1, and transferring the regenerated solvent to the top of said internal heat exchange zone; and e) recycling the regenerated solvent to the absorption zone C1.