David K Stern

US Patent:

6398947, Jun 4, 2002

Filed:

Sep 27, 1999

Appl. No.:

09/406440

Inventors:

Jeffrey S. Beck - Burlington NJ
Vinaya A. Kapoor - Kirkwood Voorhees NJ
David L. Stern - Mount Laurel NJ
John H. Thurtell - Glen Mills PA

Assignee:

Exxon Mobil Oil Corporation - Fairfax VA

International Classification:

C10G 3506

US Classification:

208 65, 208 63, 208 66, 208134, 208137, 208138

Abstract:

The patent application discloses an integrated process for reformate upgrading. Such a process enables production of a high value product slate, by incorporating the step of reforming along with reaction/diffusion with a zeolite.

US Patent:

6504075, Jan 7, 2003

Filed:

Jan 22, 2001

Appl. No.:

09/767183

Inventors:

Jeffrey S. Beck - Burlington NJ
Carrie L. Kennedy - Turnersville NJ
Wieslaw J. Roth - Sewell NJ
David L. Stern - Mount Laurel NJ

Assignee:

ExxonMobil Oil Corporation - Fairfax VA

International Classification:

C07C 552

US Classification:

585475, 585481

Abstract:

A synthetic porous crystalline material has the structure of ZSM-5 and a composition involving the molar relationship: wherein X is a trivalent element; Y is a tetravalent element; and n is less than 25, and wherein the slope of the nitrogen sorption isotherm of the material at a partial pressure of nitrogen of 0. 4 to 0. 7 and a temperature 77Â K is greater than 30. The material has a mesoporous surface area (MSA) greater than 45 m /g and is useful as a catalyst in the liquid phase isomerization of xylene.

US Patent:

6576582, Jun 10, 2003

Filed:

Nov 15, 1995

Appl. No.:

08/558309

Inventors:

Jeffrey S. Beck - Lawrenceville NJ
Jane C. Cheng - Clarksburg NJ
Sharon B. McCullen - Newtown PA
David H. Olson - Pennington NJ
David L. Stern - Lawrenceville NJ

Assignee:

ExxonMobil Oil Corporation - Fairfax VA

International Classification:

B01J 2906

US Classification:

502 71, 502 63, 502 64, 502 77, 502 85

Abstract:

There is provided a substantially binder-free catalytic molecular sieve which has been modified by being ex situ selectivated with a silicon compound. The ex situ selectivation involves exposing the molecular sieve to at least two silicon impregnation sequences, each sequence comprising an impregnation with a silicon compound followed by calcination. The catalyst may be used in a hydrocarbon conversion process, such as toluene disproportionation.

US Patent:

6610264, Aug 26, 2003

Filed:

May 5, 1995

Appl. No.:

08/435920

Inventors:

John Scott Buchanan - Trenton NJ
David L. Stern - Lawrenceville NJ
Gerald J. Teitman - Vienna VA

Assignee:

ExxonMobil Oil Corporation - Fairfax VA

International Classification:

B01D 5348

US Classification:

4232421, 423222, 42324401, 42324402, 42324406, 42324407, 4235731, 4235741, 4235768

Abstract:

A process and system is disclosed for removing sulfur from tail-gas emitted from a Claus sulfur recovery process. First, the tail-gas is oxidized so as to convert sulfur therein to sulfur oxides. Oxidized tail-gas is directed into an absorber where a solid absorbent absorbs substantially all the sulfur oxides thereon. After allowing sufficient time for a desired amount of sulfur oxides to be absorbed, absorption is ceased. Next, the solid absorbent containing the absorbed sulfur oxides is contacted with a reducing gas so as to release an off gas containing hydrogen sulfide and sulfur dioxide. Upon releasing sulfur from the solid absorbent, the solid absorbent is regenerated and redirected into the absorber. Sulfur in the off gas emitted by regeneration is concentrated to an extent sufficient for use within a Claus sulfur recovery process for conversion to elemental sulfur. By combining this process with a Claus sulfur recovery process, sulfur dioxide emissions can be reduced to less than about two parts per million.

US Patent:

6777583, Aug 17, 2004

Filed:

Aug 26, 2002

Appl. No.:

10/227663

Inventors:

Jeffrey S. Beck - Lawrenceville NJ
Jane C. Cheng - Clarksburg NJ
Sharon B. McCullen - Newtown PA
David H. Olson - Pennington NJ
David L. Stern - Lawrenceville NJ

Assignee:

ExxonMobil Oil Corporation - Irving TX

International Classification:

C07C 552

US Classification:

585475, 585470, 208 46

Abstract:

There is provided a substantially binder-free catalytic molecular sieve which has been modified by being ex situ selectivated with a silicon compound. The ex situ selectivation involves exposing the molecular sieve to at least two silicon impregnation sequences, each sequence comprising an impregnation with a silicon compound followed by calcination. The catalyst may be used in a hydrocarbon conversion process, such as toluene disproportionation.

US Patent:

6781025, Aug 24, 2004

Filed:

Jul 11, 2001

Appl. No.:

09/903476

Inventors:

Ajit B Dandekar - South Plainfield NJ
Michael Hryniszak - Bordentown NJ
David Lawrence Stern - Annandale NJ
Jeffrey Scott Beck - Clinton NJ

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 258

US Classification:

585467, 585904

Abstract:

The present invention provides a process for regenerating a spent aromatics alkylation or transalkylation catalyst comprising a molecular sieve by contacting the spent catalyst with an oxygen-containing gas at a temperature of about 120 to about 600Â C. and then contacting the catalyst with an aqueous medium, such as an ammonium nitrate solution, an ammonium carbonate solution or an acetic acid solution.

US Patent:

6878654, Apr 12, 2005

Filed:

Sep 13, 2002

Appl. No.:

10/243572

Inventors:

Ajit B. Dandekar - South Plainfield NJ, US
Michael Hryniszak - Bordentown NJ, US
Jeffrey S. Beck - Clinton NJ, US
David L. Stern - Annandale NJ, US
Kathleen M. Keville - Beaumont TX, US

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

B01J020/34
B01J021/08

US Classification:

502 23, 502 26, 502 27, 502 28, 502 29, 502 33

Abstract:

The present invention provides a process for regenerating a spent aromatics alkylation or transalkylation catalyst comprising a molecular sieve by contacting the spent catalyst with an oxygen-containing gas at a temperature of about 120 to about 600 C. and then contacting the catalyst with an aqueous medium, such as an ammonium nitrate solution, an ammonium carbonate solution or an acid solution.

US Patent:

6888037, May 3, 2005

Filed:

Dec 13, 2002

Appl. No.:

10/319161

Inventors:

Ajit B. Dandekar - South Plainfield NJ, US
Michael Hryniszak - Bordentown NJ, US
David Lawrence Stern - Annandale NJ, US

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C002/66

US Classification:

585467, 585475, 585323

Abstract:

A process for producing cumene is provided which comprises the step of contacting benzene and propylene under at least partial liquid phase alkylating conditions with a particulate molecular sieve alkylation catalyst, wherein the particles of said alkylation catalyst have a surface to volume ratio of about 80 to less than 200 inch.