公开(公告)号：US20180141025A1

公开(公告)日：2018-05-24

申请号：US15579419

申请日：2016-06-02

Applicant: SCIENTIFIC DESIGN COMPANY, INC.

Inventor： Christelle VERRIER ,  Wojciech L. SUCHANEK

IPC: B01J21/04 ,  B01J23/50 ,  B01J23/36 ,  B01J23/04 ,  B01J35/10 ,  B01J37/00 ,  C07D301/10 ,  B01J19/00

CPC classification number: B01J21/04 ,  B01J19/0013 ,  B01J23/04 ,  B01J23/36 ,  B01J23/50 ,  B01J35/04 ,  B01J35/1009 ,  B01J35/1038 ,  B01J35/1042 ,  B01J35/1047 ,  B01J35/108 ,  B01J37/0018 ,  B01J37/086 ,  B01J2219/00051 ,  C04B38/00 ,  C04B38/08 ,  C04B41/009 ,  C04B41/4535 ,  C04B41/5116 ,  C04B41/88 ,  C04B2111/0081 ,  C07D301/10 ,  C07D301/22 ,  C04B35/10 ,  C04B38/0096 ,  C04B41/455

Abstract: A method is provided for improving the performance of a silver-based epoxidation catalyst comprising a carrier. The carrier includes at least 80 percent alpha alumina and has a pore volume from 0.3 mL/g to 1.2 mL/g, a surface area from 0.3 m2/g to 3.0 m2/g, and a pore architecture that provides at least one of a tortuosity of 7 or less, a constriction of 4 or less and a permeability of 30 mdarcys or greater. A catalytic amount of silver and a promoting amount of one or more promoters is disposed on and/or in said carrier. The method further includes the steps of initiating an epoxidation reaction by reacting a feed gas composition containing ethylene and oxygen present in a ratio of from about 3.5:1 to about 12:1, in the presence of the silver-based epoxidation catalyst at a temperature of about 200° C. to about 230° C., and subsequently increasing the temperature either stepwise or continuously.