Activated catalyst for the vapor phase hydrogenation of maleic a

Details Activated catalyst for the vapor phase hydrogenation of maleic a Activated catalyst for the vapor phase hydrogenation of maleic a

1991-10-02

1992-06-16

Shine, W. J.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Inorganic carbon containing

502342, B01J 2104, B01J 2306, B01J 2372, B01J 2720

Patent

active

051224950

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.

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