Patent ID: 8551297
Filing Date: 2013-10-08
Classification: B01D

Abstract:
1. A process for extractive distillation, comprising: feeding a solvent to an extractive distillation column via a solvent feeding inlet thereof, the column having several recycling trays between the solvent feeding inlet and a top of the column, wherein the solvent has a feeding temperature 3.5 to 22.5° C. higher than a top temperature of the extractive distillation column; feeding a mixture comprising a light component and a heavy component to the extractive distillation column via a mixture feeding inlet thereof, wherein the mixture is liquid, and the mixture feeding inlet is lower than the solvent feeding inlet, in such a manner that a solvent ratio of the extractive distillation column is reduced; condensing a vapor generated by the mixture in an upper portion of the extractive distillation column to obtain the light component; and separating the solvent in a lower portion of the extractive distillation column to obtain the heavy component.