Process for preparing 1,4-butanediol from maleic anhydride

Details Process for preparing 1,4-butanediol from maleic anhydride Process for preparing 1,4-butanediol from maleic anhydride

1995-08-25

1998-01-06

Cintins, Marianne M.

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

Organic compounds

Oxygen containing

568861, C07C 3120

Patent

active

057057150

ABSTRACT:
Maleic anhydride (MA) is first reacted with 1,4-butanediol in a molar ratio of 1,4-butanediol:MA=1.1-2:1 to give an oligoester which is subsequently hydrogenated with excess hydrogen at 100-400 bar in two hydrogenation steps to give 1,4-butanediol. The first hydrogenation step is carried out at 60.degree.-130.degree. C. over a support-free catalyst of compacted metal powder of Ni, Fe, Co or mixtures thereof; the second hydrogenation step is carried out at 190.degree.-230.degree. C. over a reduced, support-free catalyst of compacted powders of copper oxides, ZnO and Al.sub.2 O.sub.3 containing proportions of oxides of Ni, Fe, Co or mixtures of a plurality thereof. A temperature difference of 60.degree.-130.degree. C. is set between the two hydrogenation steps.

REFERENCES:
patent: 5073650 (1991-12-01), Stabel et al.
patent: 5196602 (1993-03-01), Budge et al.

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