David B Stern

US Patent:

20030038058, Feb 27, 2003

Filed:

Aug 2, 2002

Appl. No.:

10/211202

Inventors:

Madhav Acharya - New Castle DE, US
Jeffrey Beck - Burlington NJ, US
Robert Crane - Monroeville NJ, US
Arthur Chester - Cherry Hill NJ, US
Vinaya Kapoor - Kirkwood Voorhees NJ, US
Richard Kovacs - Mantua NJ, US
David Stern - Mount Laurel NJ, US

International Classification:

C10G035/06

US Classification:

208/135000

Abstract:

This is a process for upgrading a petroleum naphtha fraction. The naphtha is subjected to reforming and the reformate is cascaded to a benzene and toluene synthesis zone over a benzene and toluene synthesis catalyst comprising a molecular sieve of low acid activity. The preferred molecular sieve is steamed ZSM-5. The benzene and toluene synthesis zone is operated under conditions compatible with the conditions of the reformer such as temperatures of above about 800 F. (427 C.). In one aspect on the invention, the benzene and toluene synthesis catalyst includes a metal hydrogenation component from group VII(B), specifically rhenium. In one mode of operation, the benzene and toluene synthesis catalyst replaces at least a portion of the catalyst in the reformer. The process produces a product containing an increased proportion of benzene, toluene, and/or xylenes, and a reduced portion of alkylated aromatics, as compared to reformate.

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:

62078712, Mar 27, 2001

Filed:

Dec 19, 1997

Appl. No.:

8/995270

Inventors:

Stuart D. Hellring - Pittsburgh PA
David L. Stern - Mount Laurel NJ

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

C07C15/12;5/22;4/12;5/52

US Classification:

585475

Abstract:

There is provided a process for producing high-purity meta-xylene by converting a hydrocarbon feedstream comprising at least about 5 wt % ethylbenzene and at least about 20 wt % meta-xylene, over a single molecular sieve catalyst under ethylbenzene conversion conditions sufficient to provide a primary product stream depleted of more than 50% of the ethylbenzene present in the feedstream. The process can further comprise stripping benzene and/or toluene by-products from the primary product stream to provide a secondary product stream comprising at least about 75 wt % mixed ortho-xylene and meta-xylene; and splitting the secondary product stream by removing substantially all of the ortho-xylene present therein to provide a tertiary product stream comprising at least about 95 wt % meta-xylene.

US Patent:

50498789, Sep 17, 1991

Filed:

Apr 10, 1989

Appl. No.:

7/336008

Inventors:

David M. Stern - Merion Station PA

Assignee:

Drexelbrook Engineering Company - Horsham PA

International Classification:

G08B 2100

US Classification:

3408704

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:

57414696, Apr 21, 1998

Filed:

Oct 4, 1996

Appl. No.:

8/727843

Inventors:

Nazeer A. Bhore - Wilmington DE
David L. Johnson - Glen Mills PA
Khushrav E. Nariman - Lawrenceville NJ
David L. Stern - Princeton NJ

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

B01J 800
C01B 700

US Classification:

42324401

Abstract:

A dry, regenerable solid oxide process directed to convert SO. sub. x from the flue gas stream from a power plant, a coal or oil-fired plant or process heat furnace, or an FCC regenerator to elemental sulfur without using a Claus unit, a hydrogen plant, a regeneration gas separation system, or a hydrogenation section. This dry, regenerable solid oxide process is also effective on Claus plant tail-gas. This process uses solid oxides, such as, for example, magnesium aluminates or spinels to remove sulfur oxides from flue gas streams. The solid oxide is then regenerated by a reducing gas to release the sulfur compounds contained on the solid oxide to produce a gas stream comprising hydrogen sulfide, sulfur oxides and elemental sulfur. The elemental sulfur is then condensed and recovered as a product and the resulting gas stream may be recycled to be reprocessed over the solid oxide.

US Patent:

48518310, Jul 25, 1989

Filed:

May 29, 1984

Appl. No.:

6/615151

Inventors:

David M. Stern - Merion Station PA

Assignee:

Drexelbrook Engineering Co. - Horsham PA

International Classification:

G08B 2100

US Classification:

34087016

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.