Patent ID: 6288287
Filing Date: 2001-09-11
Classification: B01D,C07C

Abstract:
A process for recovering glycerol from a crude glycerol comprising glycerol, a diol and water, comprising the steps of:feeding the crude glycerol to a preparation apparatus comprising two or more, serially connected flash towers and a distillation tower connected to a final flash tower, wherein a bottom fraction of each flash tower is fed to a subsequent flash tower; andadjusting an internal pressure of each flash tower to 0.13 to 40 kPa, an internal temperature of each flash tower to 140.degree. C. or less, a water content of the bottom fraction of the final flash tower to 0.1% by weight or less, and a pressure at the bottom of the distillation tower to 0.13 to 0.90 kPa.