公开(公告)号：MX9307070A

公开(公告)日：1994-05-31

申请号：MX9307070

申请日：1993-11-12

Applicant: DEGUSSA

Inventor： KLENK HERBERT ,  GIRKE WALTER ,  HASS THOMAS ,  NEHER ARMIN ,  ARNTZ DIETRICH

IPC: C07C29/136 ,  C07C31/20 ,  C07C29/141 ,  C07C29/145 ,  C07C45/52 ,  C07C45/64 ,  C07C47/22 ,  C07C49/17 ,  C07C29/60

Abstract: The invention relates to a method for the simultaneous preparation of 1,2- and 1,3-propanediol from glycerol. 1,2-Propanediol is customarily prepared from propylene oxide, 1,3-propanediol by hydration of acrolein with subsequent hydrogenation. The process according to the invention comprises the reaction stages (a) dehydration of glycerol by passing a gaseous glycerol/water mixture containing 10 to 40% by weight of glycerol at 250 to 340@C over a solid catalyst having an Ho value (Hammett's acid function) of less than 2, preferably between -3 and -8.2, (b) hydration of the acrolein contained in the reaction mixture of stage (a) and (c) catalytic hydrogenation of the reaction mixture containing the 3-hydroxypropionaldehyde and hydroxyacetone of stage (b). Two useful substances, namely 1,2- and 1,3-propanediol, can simultaneously be obtained in a high total yield from glycerol in a simple process.