| abstract |
In a process for the preparation of aliphatic α, ω-diols with 4 to 12 C atoms from aliphatic α, ω-dicarboxylic acids with 4 to 12 C atoms, an oligoester is first formed from diol and dicarboxylic acid, which is then catalytically hydrogenated in the liquid phase becomes. The hydrogenation is carried out continuously at 180 to 250 ° C. and an H 2 pressure of 100 to 400 bar over a lumpy catalyst from compressed powders of Cu, Zn and Al oxides with or without a content of at least one oxide of metals the iron group of the Periodic Table of the Elements (Mendeleev) or manganese. The amount of H 2 is 20 to 100 times the amount required stoichiometrically. |