Robert A Paddock

US Patent:

6870004, Mar 22, 2005

Filed:

Aug 26, 2002

Appl. No.:

10/229387

Inventors:

SonBinh T. Nguyen - Evanston IL, US
Robert L. Paddock - Evanston IL, US
Jinhui Chen - Evanston IL, US

Assignee:

Northwestern University - Evanston IL

International Classification:

C08L053/00

US Classification:

525 88

Abstract:

Salen complexes were found to be excellent catalysts for the reaction of terminal epoxides with COwhen used in conjunction with a Lewis base cocatalyst (DMAP). This catalyst system cleanly affords the product cyclic carbonates in high yield under mild reaction conditions and is applicable to a variety of terminal epoxides.

US Patent:

20200001277, Jan 2, 2020

Filed:

Nov 29, 2017

Appl. No.:

16/465445

Inventors:

- HOUSTON TX, US
Robert Lewis PADDOCK - Houston TX, US
Randall Clayton YEATES - Sugar Land TX, US
John Robert LOCKEMEYER - Sugar Land TX, US

International Classification:

B01J 23/68
B01J 37/14
C07D 301/10
C07D 303/04
B01J 37/08

Abstract:

Methods for conditioning an ethylene epoxidation catalyst are provided. The conditioning methods comprise contacting an ethylene epoxidation catalyst comprising a carrier, having silver and a rhenium promoter deposited thereon, with a conditioning feed gas comprising oxygen for a period of time of at least 2 hours at a temperature that is above 180 C. and at most 250 C., wherein the contacting of the ethylene epoxidation catalyst with the conditioning feed gas occurs in an epoxidation reactor and in the absence of ethylene. Associated methods for the epoxidation of ethylene are also provided.