Process for separating a gas mixture by means of absorption.

摘要

Process for the separation of a mixture of gases, which comprises: a) a stage of absorption in an absorption zone C1 of a part G2 of a gaseous mixture G1 by a solvent L1; b) a decompression of the solvent L1 resulting in the partial vaporisation of the absorbed gases G2 and cooling of the solvent L1; c) a stage of desorption of the gaseous fraction G2 in a desorption device D1 comprising a reboiling zone B1 and an internal heat exchange zone Z1, in which the solvent L1 originating from stage (b) circulates in contact overall countercurrentwise with the vapour phase, while simultaneously exchanging heat overall countercurrentwise with the solvent phase originating from the reboiling zone B1; d) directing the regenerated solvent leaving the reboiling zone B1 in the heat exchange zone Z1 and removal of the said regenerated solvent at the top of the said internal heat exchange zone; and e) recycling the said regenerated solvent towards the absorption zone C1.