公开(公告)号：US11931725B2

公开(公告)日：2024-03-19

申请号：US17867950

申请日：2022-07-19

Applicant: Scientific Design Company, Inc.

Inventor： Xiankuan Zhang ,  Christelle Verrier

IPC: C07D301/03 ,  B01J21/04 ,  B01J23/36 ,  B01J23/50 ,  B01J35/00 ,  B01J35/08 ,  B82Y30/00 ,  B82Y40/00

CPC classification number: B01J23/50 ,  B01J21/04 ,  B01J23/36 ,  B01J35/006 ,  B01J35/08 ,  C07D301/03 ,  B82Y30/00 ,  B82Y40/00

Abstract: A conditioning process that is employed with a high selectivity catalyst (HSC) during an initial phase (i.e., start-up) of the epoxidation process is provided. The HSC conditioning process of the present disclosure ensures that the heat release from a catalyst bed containing an HSC during a start-up operation is less than 2000 kJ/Kgcat·hr. The HSC containing catalyst bed that has been conditioned by the process of the present disclosure exhibits improved performance (i.e., EO selectivity) and reduced hot spots.

公开(公告)号：US20240024857A1

公开(公告)日：2024-01-25

申请号：US17867950

申请日：2022-07-19

Applicant: Scientific Design Company, Inc.

Inventor： Xiankuan Zhang ,  Christelle Verrier

IPC: B01J23/50 ,  B01J21/04 ,  B01J23/36 ,  B01J35/08 ,  B01J35/00

CPC classification number: B01J23/50 ,  B01J21/04 ,  B01J23/36 ,  B01J35/08 ,  B01J35/006 ,  B82Y30/00

Abstract: A conditioning process that is employed with a high selectivity catalyst (HSC) during an initial phase (i.e., start-up) of the epoxidation process is provided. The HSC conditioning process of the present disclosure ensures that the heat release from a catalyst bed containing an HSC during a start-up operation is less than 2000 kJ/Kgcat·hr. The HSC containing catalyst bed that has been conditioned by the process of the present disclosure exhibits improved performance (i.e., EO selectivity) and reduced hot spots.

公开(公告)号：US10040055B2

公开(公告)日：2018-08-07

申请号：US15579419

申请日：2016-06-02

Applicant: SCIENTIFIC DESIGN COMPANY, INC.

Inventor： Christelle Verrier ,  Wojciech L. Suchanek

IPC: B01J21/04 ,  B01J21/08 ,  B01J21/12 ,  B01J23/04 ,  B01J23/36 ,  B01J23/50 ,  B01J35/10 ,  B01J19/00 ,  C07D301/10 ,  B01J37/00

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.