| 摘要 |
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 Al2O3, and activating the reduced catalyst composition in hydrogen at an activation temperature of at least 400 DEG C., preferably 400 DEG to 525 DEG C., and optimally about 425 DEG 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.
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