David R 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:

44856733, Dec 4, 1984

Filed:

May 13, 1981

Appl. No.:

6/263351

Inventors:

David M. Stern - Merion Station PA

Assignee:

Drexelbrook Engineering Company - Horsham PA

International Classification:

G01F 2326
G01R 2700

US Classification:

73304C

Abstract:

An improved system for generating a signal representative of the level of a material having a dielectric constant within a vessel is disclosed. The system features use of a first probe for generating a signal indicative of the dielectric constant of the material which is divided into a signal varying with the level of the material whereby a compensated level signal irrespective of the actual dielectric constant is measured. In a preferred embodiment, a single integrator is used to perform the division operation whereby inaccuracies due to component variation including long-term drift are eliminated. The instrument is disclosed as functioning in a two-wire instrument system having low power requirements, permitting use of conventional signal limits. Means for calibrating the instrument in a fail-safe manner such that the operator is assured of proper calibration are disclosed, as is means whereby bridge circuits used to measure in the capacitance measurements supplied to the division circuit are both supplied by a single oscillator means, again increasing reliability and accuracy of the system.

US Patent:

52290913, Jul 20, 1993

Filed:

Apr 15, 1992

Appl. No.:

7/868432

Inventors:

J. Scott Buchanan - Mercerville NJ
David L. Stern - Yardley PA
Joseph F. Sodomin - Centreville VA
Gerald J. Teman - Vienna VA

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

B01J 800
C01B 1700

US Classification:

42324401

Abstract:

A process 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:

60490187, Apr 11, 2000

Filed:

Jan 21, 1999

Appl. No.:

9/234544

Inventors:

David C. Calabro - Princeton Junction NJ
Jane C. Cheng - Voorhees NJ
Robert A. Crane - Monroeville NJ
Charles T. Kresge - West Chester PA
Sandeep S. Dhingra - Robbinsville NJ
Michael A. Steckel - Media PA
David L. Stern - Mount Laurel NJ
Simon C. Weston - Voorhees NJ

Assignee:

Mobil Corporation - Fairfax VA

International Classification:

C01B 3950
C07C 266

US Classification:

585446

Abstract:

This invention relates to a new synthetic porous crystalline material, designated MCM-68, a method and novel polycyclic organic cation for its preparation and its use in catalytic conversion of organic compounds. The new crystalline material exhibits a distinctive X-ray diffraction pattern and has a unique crystal structure which contains at least one channel system, in which each channel is defined by a 12-membered ring of tetrahedrally coordinated atoms, and at least two further, independent channel systems, in each of which each channel is defined by a 10-membered ring of tetrahedrally coordinated atoms, wherein the number of unique 10-membered ring channels is twice the number of 12-membered ring channels.