David B Stern

US Patent:

7166756, Jan 23, 2007

Filed:

Nov 25, 2003

Appl. No.:

10/722242

Inventors:

Madhav Acharya - Vienna VA, US
David L. Stern - Baton Rouge LA, US

Assignee:

Exxonmobil Research and Engineering Company - Annandale NJ

International Classification:

C07C 5/23
C07C 5/27

US Classification:

585481, 585482, 585666, 585670, 585739

Abstract:

The present invention is directed at a process to isomerize C hydrocarbon feedstreams by contacting a C hydrocarbon feedstream with a steamed catalyst.

US Patent:

7553790, Jun 30, 2009

Filed:

Oct 25, 2005

Appl. No.:

11/258440

Inventors:

Jean W. Beeckman - Columbia MD, US
Glenn R. Sweeten - East Stroudsburg PA, US
Daria N. Lissy - Glen Mills PA, US
David L. Stern - Baton Rouge LA, US
Stephen J. McCarthy - Center Valley PA, US
Dominick N. Mazzone - Wenonah NJ, US
Christine N. Elia - Bridgewater NJ, US

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

B01J 29/06

US Classification:

502 60, 502 64, 502 85

Abstract:

The present invention describes a method to increase the activity of a catalyst by first performing an ion exchange step with a potassium ion, followed by performing an ion-exchange step with an ammonium ion. Specifically, the present invention describes a method to increase the acidity of a zeolite by incorporating a potassium salt ion-exchange prior to an ammonium salt ion-exchange step. Even more specifically, the present invention is drawn to a method of increasing the activity of a zeolite by employing more than one potassium ion exchanges followed by at least one ammonium ion exchange. The present invention also describes a method to reduce the amount of sodium normally found in commercially produced zeolite by employing any of these methods. The present invention is also drawn to the catalysts produced by any of these methods.

US Patent:

8187456, May 29, 2012

Filed:

Jan 23, 2006

Appl. No.:

11/795552

Inventors:

John W. Viets - Fairfax VA, US
Narasimhan Sundaram - Fairfax VA, US
Bal K. Kaul - Fairfax VA, US
David L. Stern - Fairfax VA, US

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C10G 49/22

US Classification:

2081113, 208108, 20811135

Abstract:

An improved process for hydrocracking heavy petroleum feedstocks wherein hydrogen-containing streams associated with a hydrocracker are subjected to rapid cycle pressure swing adsorption having a cycle time of less than 30 S.

US Patent:

8518244, Aug 27, 2013

Filed:

Jan 23, 2006

Appl. No.:

11/795547

Inventors:

James J. Schorfheide - Oak Hill VA, US
Sean C. Smyth - Schoten, BE
Bal K. Kaul - Fairfax VA, US
David L. Stern - Fairfax VA, US

Assignee:

Exxonmobil Research and Engineering Company - Annandale NJ

International Classification:

C10G 45/02

US Classification:

208212, 208209, 208213

Abstract:

This invention relates to an improved hydrotreating process for removing sulfur from naphtha and distillate feedstreams. This improved process utilizes a hydrotreating zone, an acid gas removal zone, and a pressure swing adsorption zone having a total cycle time of less than about 30 seconds for increasing the concentration of hydrogen utilized in the process.

US Patent:

20090071332, Mar 19, 2009

Filed:

Jan 23, 2006

Appl. No.:

11/795548

Inventors:

Bal K. Kaul - Fairfax VA, US
John W. Viets - Fairfax VA, US
Mohsen N. Harandi - Calgary, CA
Julian A. Wolfenbarger - Friendswood TX, US
John Di-Yi Ou - Houston TX, US
David Stern - Asbury NJ, US

International Classification:

B01D 53/047

US Classification:

95 96

Abstract:

The use of rapid cycle pressure swing adsorption having a cycle time of less than 30 s for increasing the hydrogen concentration in hydrogen-containing steams, from a hydrogen source, such as a stream reforming unit.

US Patent:

20120246999, Oct 4, 2012

Filed:

Mar 27, 2012

Appl. No.:

13/431050

Inventors:

David L. Stern - Fairfax VA, US
Salvatore R. Di Mauro - Fairfax VA, US
Aldo Roccaro - Legnano, IT
Paul W. Bessonette - Deptford NJ, US

Assignee:

EXXONMOBIL RESEARCH AND ENGINEERING COMPANY - Annandale NJ

International Classification:

C10L 1/10
C10G 45/08

US Classification:

44300, 208213, 208212

Abstract:

This invention relates to low sulfur marine/bunker fuel compositions and methods of making same. Contrary to conventional marine/bunker fuel compositions/methods, the inventive lower sulfur compositions/methods focus on use of mostly uncracked components, such as (cat feed) hydrotreated gasoils, and/or can also have reduced contents of residual components.

US Patent:

20130340323, Dec 26, 2013

Filed:

Aug 26, 2013

Appl. No.:

13/975828

Inventors:

David Lawrence Stern - Fairfax VA, US
Salvatore R. Di Mauro - Fairfax, IT
Aldo Roccaro - Legnano, MI, IT
Paul William Bessonette - Deptford NJ, US

Assignee:

EXXONMOBIL RESEARCH AND ENGINEERING COMPANY - Annandale NJ

International Classification:

C10L 1/16

US Classification:

44300, 208 15

Abstract:

This invention relates to low sulfur marine/bunker fuel compositions and methods of making same. Contrary to conventional marine/bunker fuel compositions/methods, the inventive lower sulfur compositions/methods focus on use of mostly uncracked components, such as (cat feed) hydrotreated gasoils, and/or can also have reduced contents of residual components.