Process for the preparation of aliphatic .alpha., .omega.-diols

Details Process for the preparation of aliphatic .alpha., .omega.-diols Process for the preparation of aliphatic .alpha., .omega.-diols

1996-01-05

1997-12-09

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568852, C07C 2914

Patent

active

056963033

ABSTRACT:
In a process for the preparation of aliphatic .alpha.,.omega.-diols of 4 to 12 carbon atoms from aliphatic .alpha.,.omega.-dicarboxylic acids of 4 to 12 carbon atoms, an oligo ester is first of all formed from diol and dicarboxylic acid and is subsequently subjected to catalytic hydrogenation in the liquid phase. The hydrogenation is carried out continuously at from 180.degree. to 250.degree. C. and at an H.sub.2 pressure of from 100 to 400 bar over a catalyst in piece form comprising compressed powders of Cu, Zn and Al oxides which do or do not contain at least one oxide of metals of the iron group of the Periodic Table of the Elements (Mendeleev) or of manganese. The quantity of H.sub.2 is from 20 to 100 times the stoichiometrically required quantity.

REFERENCES:
Chemical Abstracts, vol. 82, abstract No. 86070a, abstract of DE 2,321,101, p. 495, (1975).
Chemical Abstracts , #5477i; abstract of DE1023750; Thelen et al., 1960.

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