Ramesh C Gupta

US Patent:

6623622, Sep 23, 2003

Filed:

Sep 21, 2001

Appl. No.:

09/960015

Inventors:

Ramesh Gupta - Berkeley Heights NJ

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C10G 6502

US Classification:

208 59, 208 58, 208 89, 208210

Abstract:

A diesel fraction is purified by a process having two reaction stages and a stripping stage in a single vessel. Heteroatoms are removed in the first stage, to permit the use of a sulfur sensitive aromatics saturation catalyst in the second stage, to produce a purified diesel stock. The first stage liquid effluent is stripped in a stripping stage and then passed into the second reaction stage, in which it reacts with fresh hydrogen for aromatics removal. The second reaction stage produces a hydrogen-rich vapor effluent, which may provide all or a portion of the first stage reaction hydrogen. A noble metal catalyst is employed in the second stage. The diesel feed for the process may be one that has been at least partially refined with respect to either or both heteroatom or aromatics removal.

US Patent:

6632350, Oct 14, 2003

Filed:

Sep 21, 2001

Appl. No.:

09/960014

Inventors:

Ramesh Gupta - Berkeley Heights NJ

Assignee:

ExxonMobile Research and Engineering Company - Annandale NJ

International Classification:

C10G 6502

US Classification:

208 59, 208 58, 208 89, 208210

Abstract:

A hydrocarbonaceous feed is hydroprocessed in a single vessel containing two reaction stages and a stripping stage. The feed is fed into the first reaction stage to produce a vapor and liquid effluent which are separated, and the liquid stripped. The stripped liquid is passed as feed into the second stage, in which it meets with fresh hydrogen to produce a hydroprocessed liquid product and a hydrogen-rich vapor. The vapor is passed into the first stage, to provide the hydrogen for that stage. The use of a single vessel provides an efficient and economical addition to, or replacement for, a vessel for an existing hydroprocessing facility.

US Patent:

6689329, Feb 10, 2004

Filed:

Oct 10, 2001

Appl. No.:

09/974561

Inventors:

Ramesh Gupta - Berkeley Heights NJ
Salvatore Joseph Rossetti - Bernardsville NJ

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

B01J 804

US Classification:

422191, 422193, 422195, 422211, 422217, 422220

Abstract:

The invention is directed to a bypass device for extending the operating life of fixed bed reactors. The device may be placed within a fixed catalyst bed to partition the bed into a first top bed and a second virtual bed. The bypass device allows any fluid feedstock to bypass the first top bed of the fixed catalyst bed as it fouls and enter the second virtual bed under conditions that promote depositing any foulants contained in the bypass flow on the top surface of the second virtual bed rather than in the interstices of the second virtual bed. The invention also relates to an improved fixed bed reactor comprising the inventive bypass device and a method for extending the operating life of a fixed bed reactor that employs the inventive bypass device.

US Patent:

6692705, Feb 17, 2004

Filed:

Aug 22, 2001

Appl. No.:

09/933939

Inventors:

Ramesh Gupta - Berkeley Heights NJ
Salvatore Joseph Rossetti - Bernardsville NJ

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

B01J 804

US Classification:

422191, 422193, 422195, 422211, 422217, 422220

Abstract:

The invention is directed to a multi-tier bypass apparatus for extending the operating life of fixed bed reactors. The multi-tier bypass may be disposed within a fixed catalyst bed to allow any fluid feedstock to bypass successive layers of the fixed catalyst bed as they foul. The invention also relates to an improved fixed bed reactor comprising the inventive multi-tier bypass and a method for extending the operating life of a fixed bed reactor.

US Patent:

6846469, Jan 25, 2005

Filed:

Nov 14, 2000

Appl. No.:

09/712654

Inventors:

Ramesh Gupta - Berkeley Heights NJ, US
Salvatore Joseph Rossetti - Bernardsville NJ, US
David Charles Dankworth - Whitehouse Station NJ, US
Jeffrey L. Kaufman - Kingwood TX, US
David Lee Vannauker - Kingwood TX, US
James Philip Bailor - Seabrook TX, US

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

B01J 3502

US Classification:

422211, 422171, 422176, 422177, 422191, 422192, 422193, 422195, 422213, 422217, 422220

Abstract:

A method for extending the operating life of a fixed bed reactor for reacting a feedstock in which a feedstock is contacted with a fixed bed of catalytic material contained in the reactor.

US Patent:

7332138, Feb 19, 2008

Filed:

Jul 26, 2002

Appl. No.:

10/206103

Inventors:

Ramesh Gupta - Berkeley Heights NJ, US
Robert Koros - Westfield NJ, US
Ramesh R. Hemrajani - Millington NJ, US

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

B01J 8/04

US Classification:

422194, 422191, 422207, 422190

Abstract:

A fixed bed catalytic reactor for converting process fluids having an upper catalyst bed and a lower catalyst bed below the upper catalyst bed for converting process fluids flowing through the upper and lower beds. A mixing zone is located between the upper bed and lower beds, and at least one jet is provided for injecting an inclined fluid jet into the mixing zone against the flow of the process fluids to entrain process fluids within the jet and to radially mix the process fluids across the mixing zone.

US Patent:

20020031459, Mar 14, 2002

Filed:

Jul 13, 1999

Appl. No.:

09/351648

Inventors:

RAMESH GUPTA - BERKELEY HEIGHTS NJ, US
SALVATORE JOSEPH ROSSETTI - BERNARDSVILLE NJ, US
DAVID CHARLES DANKWORTH - WHITEHOUSE STATION NJ, US
JEFFREY L. KAUFMAN - KINGWOOD TX, US
DAVID LEE VANNAUKER - KINGWOOD TX, US
JAMES PHILIP BAILOR - SEABROOK TX, US

International Classification:

B01J008/08

US Classification:

422/217000

Abstract:

The invention is directed to a reactor for reacting a feedstock, said reactor comprising, a fixed catalyst bed for reaction of said feedstock said reactor containing a bypass apparatus disposed within said fixed catalyst bed, said bypass apparatus being aligned with the direction of flow of said feedstock, and wherein said bypass apparatus comprise a cage member comprising a first elongated hollow member having a top wall, sidewalls and a bottom wall, said cage member having openings therein, and a second hollow elongated member for passing said feedstock therethrough, said second hollow elongated member being disposed within and protruding through said top wall of said cage member and wherein said second elongated member extends above said catalyst bed through said cage member.

US Patent:

20060037589, Feb 23, 2006

Filed:

Jul 22, 2005

Appl. No.:

11/187672

Inventors:

Ramesh Gupta - Berkeley Heights NJ, US
Sanjay Bhatia - Manassas Park VA, US
George Walchuk - Annandale NJ, US
Randall Partridge - Califon NJ, US
Walter Weissman - Basking Ridge NJ, US

International Classification:

F02G 5/00
F02B 13/00

US Classification:

123557000, 123575000

Abstract:

In an internal combustion engine fuel system having a membrane separator for separating a primary fuel into a high octane fuel and a low octane fuel, and wherein the primary fuel is heated for separation in the membrane separator, the improvement comprising a heat pipe having an evaporator section positioned to be in the heat exchange relationship with exhaust gas from the internal combustion engine under conditions of use; and a heat output area in heat exchange relationship with a primary fuel as it is fed into the separator whereby the primary fuel is heated. In one embodiment the heat pipe is a variable conductance heat pipe having a top operating temperature not greater than about 160 C.