Two-stage maleic anhydride hydrogenation process for 1,4-butaned

Details Two-stage maleic anhydride hydrogenation process for 1,4-butaned Two-stage maleic anhydride hydrogenation process for 1,4-butaned

1991-12-30

1993-03-23

Evans, Joseph E.

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

Organic compounds

Oxygen containing

549233, 549325, C07C 29149, C07C 3120

Patent

active

051966026

ABSTRACT:
Maleic anhydride is hydrogenated to produce 1,4-butanediol in a two-stage process. In the first stage maleic anhydride and/or maleic acid contacted with hydrogen at a temperature of about 100.degree. C. to about 350.degree. C. in the presence of a suitable hydrogenation catalyst to produce succinic anhydride and/or gamma-butyrolactone. In the second stage, the succinic anhydride and/or gamma-butyrolactone and hydrogen are contacted at a temperature of about 180.degree. C. to about 350.degree. C. in the presence of a ruthenium-containing hydrogenation catalyst to produce 1,4-butanediol.

REFERENCES:
patent: 4010197 (1977-03-01), Toriya et al.
patent: 4301077 (1981-11-01), Pesa et al.
patent: 5073650 (1991-12-01), Stabel et al.

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