Patent ID: 6803341
Filing Date: 2004-10-12
Classification: B01J,C07C

Abstract:
A method of preparing a high stability selective hydrogenation catalyst for use in DMCHD manufacturing including the steps of:forming an Ru/Al2O3 catalyst including: a. inserting 110 grams Al2O3 into a triple neck bottle under vacuum conditions; b. heating said bottle at a temperature of 110Â° C. for 6 hours; c. cooling to ambient temperature then removing the bottle from vacuum conditions; d. adding a solution of 4.6 grams RuCl3 into said bottle and heating at a temperature of 60Â° C.; e. drying said solution by vacuum suction; and f. heat heating said bottle in a heater at a temperature of 120Â° C. for 16 hours; whereby the catalyst activity is raised by the steps of: g. removing the intermediate product of Ru/Al2O3 catalyst from said bottle after step f, and putting said intermediate product into a stainless steel breeder; h. adding hydrogen gas into said breeder at a predetermined flow rate and heating at a temperature of 450Â° C. for 2 hours; and i. cooling to atmospheric temperature and then adding a small quantity of air for passivating the surface of said catalyst to obtain a high stability catalyst for selective hydrogenation in a DMCHD manufacturing process.