Patent ID: 7998248
Filing Date: 2011-08-16
Classification: B01D

Abstract:
1. A process for the dehydration of gases, comprising: a. absorbing water vapor by means of a hygroscopic liquid consisting essentially of one or more C2-C8 glycols and an additive capable of forming a minimum type azeotrope with water, selected from the group consisting of:  with a glycol/water vapor molar ratio of from 6.5 to 65,  wherein the additive is used in concentrations of from 2 to 20% by weight, with respect to the glycol; b. distilling the glycol/water/additive mixture to obtain a top product consisting essentially of the azeotropic mixture (additive+water) and a bottom product consisting essentially of glycol and additive; c. recycling the distillation bottom product (hygroscopic absorption liquid) to the absorption stage; and d. separating, in an at least two phase separator, the distillation top product which separates into one phase consisting essentially of the additive, to be recycled to distillation, and one phase consisting essentially of water, to be discharged outside the plant.