Patent ID: 6037504
Filing Date: 2000-03-14
Classification: B01J,C07C,Y02P

Abstract:
A process for producing an aliphatic .alpha.,.omega.-diol having 4 to 12 C atoms from an aliphatic .alpha.,.omega.-dicarboxylic acid having 4 to 12 C atoms by the oligoesterification of the dicarboxylic acid with the diol to form a diol carboxylate having an average chain length of n=3 to n=4.5 and an acid number of 40 to 60 mg KOH/g reaction mixture, and catalytic hydrogenation of the resulting oligoester in the liquid phase, characterized in that the oligoester is continuously hydrogenated at 180 to 250.degree. C. and at an H.sub.2 pressure of 100 to 400 bar wherein the amount of H.sub.2 is 20 to 100 times the amount required stoichiometrically, over a pelletized catalyst which is free from Zn oxide and which is made up of pressed powders of Cu, Mn and Al oxides with at least one oxide of a metal of subgroup VI of the Periodic Table of the Elements (Mendeleev).