Stephen M Lester

US Patent:

20050245775, Nov 3, 2005

Filed:

Apr 29, 2004

Appl. No.:

10/834408

Inventors:

Clark Graybill - Lake Charles LA, US
Stephen Lester - Pittsburgh PA, US

International Classification:

C07C017/358

US Classification:

570256000

Abstract:

Describes a method for recovering trans-1,2-dichloroethene from a liquid feed composition comprising both the cis- and trans-isomers of 1,2-dichloroethene and contaminating amounts of other chlorinated hydrocarbons, e.g., lower alkyl chlorinated hydrocarbons, such as CCchlorinated hydrocarbons. In one of the described methods, the liquid feed composition is introduced into a first distillation column wherein the stereoisomers and chlorinated hydrocarbons more volatile than the stereoisomers are removed as overhead and charged to a second distillation column . In column , the stereoisomers are separated from the more volatile chlorinated hydrocarbons, and a bottoms fraction comprising the stereoisomers are charged to a reaction distillation column wherein the cis-isomer, is isomerized to the trans-isomer in the liquid phase and in the presence of an organic free-radical initiator, e.g., an azonitrile initiator. Substantially pure trans-1;2-dichloroethene is recovered as overhead from reaction distillation column

US Patent:

20170327440, Nov 16, 2017

Filed:

Oct 20, 2015

Appl. No.:

15/520464

Inventors:

- Atlanta GA, US
Stephen Robert Lester - Pittsburgh PA, US

International Classification:

C07C 17/10
B01J 27/132

Abstract:

The preparation of chlorinated hydrocarbons by reacting a chlorinated alkane substrate, such as 1,1,1,3-tetrachloropropane, with a source of chlorine, such as chlorine (Cl), in the presence of a polyvalent molybdenum compound, such as molybdenum pentachloride, is described. With the method of the present invention, the chlorinated alkane product has covalently bonded thereto at least one more chlorine group than the chlorinated alkane substrate, and the chlorinated alkane substrate and the chlorinated alkane product each have a carbon backbone structure that is in each case the same.

US Patent:

20170226034, Aug 10, 2017

Filed:

Apr 28, 2017

Appl. No.:

15/581039

Inventors:

- Atlanta GA, US
Stephen Robert Lester - Pittsburgh PA, US

International Classification:

C07C 17/25
B01J 31/12
B01J 35/00
B01J 27/10

Abstract:

The preparation of chlorinated hydrocarbons, such as pentachloropropanes, such as 1,1,1,2,3-pentachloropropane, from tetrachloropropanes, such as 1,1,1,3-tetrachloropropane, in the presence of a polyvalent antimony compound that includes a pentavalent antimony compound, such as antimony pentachloride, is described. Also described are methods for preparing optionally chlorinated alkenes, such as, tetrachloropropenes, from chlorinated alkanes, such as pentachloropropanes, in the presence of polyvalent antimony compound that includes a pentavalent antimony compound, as well as methods for recovering polyvalent antimony compounds from such processes.

US Patent:

20160251283, Sep 1, 2016

Filed:

Feb 11, 2016

Appl. No.:

15/041409

Inventors:

- Atlanta GA, US
Stephen Robert Lester - Pittsburgh PA, US

International Classification:

C07C 17/23
B01J 31/12
C07C 17/06
B01J 27/10

Abstract:

The preparation of chlorinated hydrocarbons, such as pentachloropropanes, such as 1,1,1,2,3-pentachloropropane, from tetrachloropropanes, such as 1,1,1,3-tetrachloropropane, in the presence of a polyvalent antimony compound that includes a pentavalent antimony compound, such as antimony pentachloride, is described. Also described are methods for preparing optionally chlorinated alkenes, such as, tetrachloropropenes, from chlorinated alkanes, such as pentachloropropanes, in the presence of polyvalent antimony compound that includes a pentavalent antimony compound, as well as methods for recovering polyvalent antimony compounds from such processes.

US Patent:

20150045591, Feb 12, 2015

Filed:

Oct 22, 2014

Appl. No.:

14/521449

Inventors:

- Atlanta GA, US
Stephen Robert Lester - Pittsburgh PA, US

International Classification:

C07C 17/23
B01J 31/12
B01J 27/10
C07C 17/06
B01J 27/128

US Classification:

570230, 570234

Abstract:

The preparation of chlorinated hydrocarbons, such as pentachloropropanes, such as 1,1,1,2,3-pentachloropropane, from tetrachloropropanes, such as 1,1,1,3-tetrachloropropane, in the presence of a polyvalent antimony compound that includes a pentavalent antimony compound, such as antimony pentachloride, is described. Also described are methods for preparing optionally chlorinated alkenes, such as, tetrachloropropenes, from chlorinated alkanes, such as pentachloropropanes, in the presence of polyvalent antimony compound that includes a pentavalent antimony compound, as well as methods for recovering polyvalent antimony compounds from such processes.

US Patent:

20150031925, Jan 29, 2015

Filed:

Oct 1, 2014

Appl. No.:

14/503942

Inventors:

- Atlanta GA, US
Stephen Robert Lester - Pittsburgh PA, US

International Classification:

C07C 17/35

US Classification:

570216

Abstract:

The preparation of chlorinated hydrocarbons, such as pentachloropropanes, such as 1,1,1,2,3-pentachloropropane, from tetrachloropropanes, such as 1,1,1,3-tetrachloropropane, in the presence of a polyvalent antimony compound that includes a pentavalent antimony compound, such as antimony pentachloride, is described. Also described are methods for preparing optionally chlorinated alkenes, such as, tetrachloropropenes, from chlorinated alkanes, such as pentachloropropanes, in the presence of ferric chloride and a polyvalent antimony compound that includes a pentavalent antimony compound.

US Patent:

20140206911, Jul 24, 2014

Filed:

Oct 23, 2013

Appl. No.:

14/060957

Inventors:

- Atlanta GA, US
Stephen Robert Lester - Pittsburgh PA, US

Assignee:

Axiall Ohio, Inc. - Atlanta GA

International Classification:

C07C 17/23
C07C 17/06

US Classification:

570230, 570247

Abstract:

The preparation of chlorinated hydrocarbons, such as pentachloropropanes, such as 1,1,1,2,3-pentachloropropane, from tetrachloropropanes, such as 1,1,1,3-tetrachloropropane, in the presence of a polyvalent antimony compound that includes a pentavalent antimony compound, such as antimony pentachloride, is described. Also described are methods for preparing optionally chlorinated alkenes, such as, tetrachloropropenes, from chlorinated alkanes, such as pentachloropropanes, in the presence of ferric chloride and a polyvalent antimony compound that includes a pentavalent antimony compound.