Process of vapor phase catalytic hydrogenation of maleic anhydri

Details Process of vapor phase catalytic hydrogenation of maleic anhydri Process of vapor phase catalytic hydrogenation of maleic anhydri

1991-02-19

1994-09-13

Ivy, C. Warren

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549326, 568885, C07D30733

Patent

active

053470214

ABSTRACT:
Vapor phase catalytic hydrogenation of maleic anhydride to gamma-butyrolactone is achieved in a conversion of 95% or more and a selectivity of 80% or more during a prolonged period of production. The process uses an activated catalyst prepared by reducing a catalyst composition comprising 30-65% by weight of CuO, 18-50% by weight of ZnO and 8-22% by weight of Al.sub.2 O.sub.3, and activating the reduced catalyst composition in hydrogen at an activation temperature of at least 400.degree. C., preferably 400.degree. to 525.degree. C., and optimally about 425.degree. C. The process suitably is carried out under predetermined and advantageous process conditions, including a defined molar ratio of hydrogen to maleic anhydride in the vapor reactant stream, a selected pressure during hydrogenation, a defined feed rate space velocity, a predetermined contact time, and a suitable reaction temperature.

REFERENCES:
patent: 3580930 (1971-05-01), Miya et al.
patent: 4420622 (1983-12-01), Van de Moesdijk et al.
patent: 4652685 (1987-03-01), Cawse et al.

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