Process of vapor phase catalytic hydrogenation of maleic...

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

B - Operations, Transporting

01

J

B01J 23/80 (2006.01) B01J 37/18 (2006.01) C07D 307/33 (2006.01) C07D 315/00 (2006.01)

Patent

CA 2080123

2080123 9116132 PCTABS00007 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 of the invention 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, particularly, by activating the reduced catalyst composition in hydrogen at an activation temperature of at least 400 ·C, preferably 400 ·C to 525 ·C, and optimally about 425 ·C. The hydrogenation process 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, an advantageous feed rate space velocity, a predetermined contact time, and a suitable reaction temperature.

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