Janet M Clark

US Patent:

6375830, Apr 23, 2002

Filed:

Nov 21, 2000

Appl. No.:

09/718175

Inventors:

Janet R. Clark - Baton Rouge LA
Robert J. Wittenbrink - Baton Rouge LA
Daniel F. Ryan - Baton Rouge LA
Albert E. Schweizer - Baton Rouge LA

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C10G 2500

US Classification:

208 27, 208111, 208950, 208134, 308363, 308371, 308568, 308368, 585735

Abstract:

A high VI and low pour point lubricant base stock is made by hydroisomerizing a high purity, waxy, paraffinic Fischer-Tropsch synthesized hydrocarbon fraction having an initial boiling point in the range of 650-750Â F. , followed by catalytically dewaxing the hydroisomerate using a dewaxing catalyst comprising a catalytic platinum component and an H-mordenite component. The hydrocarbon fraction is preferably synthesized by a slurry Fischer-Tropsch using a catalyst containing a catalytic cobalt component. This combination of the process, high purity, waxy paraffinic feed and the Pt/H-mordenite dewaxing catalyst, produce a relatively high yield of premium lubricant base stock.

US Patent:

6409913, Jun 25, 2002

Filed:

Dec 3, 1999

Appl. No.:

09/454371

Inventors:

Janet R. Clark - Baton Rouge LA
Michele S. Touvelle - Baton Rouge LA
Thomas R. Halbert - Baton Rouge LA
Bruce R. Cook - Stewartsville NJ
Garland B. Brignac - Clinton LA

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C10G 2500

US Classification:

208213

Abstract:

Naphtha desulfurization with reduced product mercaptans is achieved by reacting a naphtha feed containing sulfur compounds and olefins with hydrogen in the presence of a hydrosesulfurization catalyst at reaction conditions including a temperature of from 290-425Â C. , a pressure of from 60-150 psig, and a hydrogen gas ratio of from 2000-4000 scf/b. It has been found that desulfurizing within these narrow conditions permits deep desulfurization with reduced mercaptan reversion, to produce a naphtha product with low total sulfur and low mercaptan sulfur levels.

US Patent:

6570047, May 27, 2003

Filed:

Nov 6, 2001

Appl. No.:

09/992371

Inventors:

Charles John Mart - Baton Rouge LA
Robert Jay Wittenbrink - Kingwood TX
Janet Renee Clark - Baton Rouge LA
Jennifer Schaefer Feeley - Lebanon NJ

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C07C 522

US Classification:

585899, 585734, 208950, 518728

Abstract:

A slurry Fischer-Tropsch hydrocarbon synthesis process for synthesizing liquid hydrocarbons from synthesis gas, in a hydrocarbon synthesis reactor, also hydroisomerizes the synthesized hydrocarbons in one or more external downcomer reactor hydroisomerizing loops outside of the reactor, but which are a part of the synthesis reactor. A monolithic catalyst is used for the hydroisomerization, and slurry circulation between the synthesis reactor and the one or more hydroisomerization loops is achieved, at least in part, by density-difference driven hydraulics created by removing gas bubbles from the slurry passed into the loop. Preferably, catalyst particles are also removed before the slurry contacts the monolithic hydroisomerization catalyst.

US Patent:

6649803, Nov 18, 2003

Filed:

Nov 6, 2001

Appl. No.:

09/992390

Inventors:

Charles John Mart - Baton Rouge LA
Robert Jay Wittenbrink - Kingwood TX
Janet Renee Clark - Baton Rouge LA
Jennifer Schaefer Feeley - Lebanon NJ

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C07C 522

US Classification:

585734, 585310, 585315, 585899, 208950, 518700, 518728

Abstract:

A slurry Fischer-Tropsch hydrocarbon synthesis process for synthesizing liquid hydrocarbons from synthesis gas in a synthesis reactor also hydroisomerizes the synthesized hydrocarbons in one or more external lift reactor hydroisomerizing loops outside of the reactor, but which are a part of the reactor. A monolithic catalyst is used for the hydroisomerization and slurry circulation between the synthesis reactor and one or more loops is achieved, at least in part, by the lift action of a hydrogen treat gas injected into each loop.

US Patent:

6753286, Jun 22, 2004

Filed:

Jan 29, 2002

Appl. No.:

10/059917

Inventors:

Janet Renee Clark - Baton Rouge LA
Russell John Koveal - Baton Rouge LA
Michel Daage - Baton Rouge LA

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

B01J 3862

US Classification:

502 28, 502 38, 502 53

Abstract:

There is provided a process for renewing the activity of used, supported metal catalysts for the hydrogenation of carbon monoxide to form a mixture of hydrocarbons comprising decreasing the hydrocarbon content of the catalyst, impregnating said catalyst under an non-oxidative atmosphere with a solution at least one weak organic acid, preferably a mono- or di-carboxylic acid, to the point where it has absorbed a volume of said solution equal to at least about 10% of its calculated pore volume, oxidizing the catalyst with a gaseous oxidant in the presence of the impregnating solution and activating the catalyst by reduction with hydrogen at elevated temperatures. Optionally, the catalyst is calcined after the oxidation step, and passivated after the activation step. A preferred means of decreasing the hydrocarbon content of the catalyst is contacting it with a hydrogen-containing gas at elevated temperatures.

US Patent:

6753351, Jun 22, 2004

Filed:

Jan 29, 2002

Appl. No.:

10/059918

Inventors:

Janet Renee Clark - Baton Rouge LA
Michel Daage - Baton Rouge LA
Russell John Koveal - Baton Rouge LA

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C07C 2700

US Classification:

518700, 518713, 518715, 518709, 518710, 502 38, 502 53, 502 54, 502 55, 502326, 502331, 208208, 208106

Abstract:

A process for activating a supported metal catalyst or catalyst precursor useful for the hydrogenation of carbon monoxide to form a mixture of hydrocarbons, comprising reducing with a hydrogen-containing gas at elevated temperature so that at least a portion is in the metallic state, impregnating under a non-oxidizing atmosphere with a solution of at least one member selected from the group consisting of ammonium salts, alkyl ammonium salts and weak organic acids, optionally further including ammonia, to the point where it has absorbed a volume of solution equal to at least about 10% of its calculated pore volume, oxidizing with a gaseous oxidant in the presence of the impregnating solution and reducing with hydrogen-containing gas at elevated temperatures to form an active catalyst. The steps beginning with the impregnation may be repeated. Optionally, the catalyst may be calcined after the oxidation step and/or passivated after activation.

US Patent:

6777451, Aug 17, 2004

Filed:

Jan 29, 2002

Appl. No.:

10/059927

Inventors:

Russell John Koveal - Baton Rouge LA
Michel Daage - Baton Rouge LA
Charles Harrison Mauldin - Baton Rouge LA
Janet Renee Clark - Baton Rouge LA

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C07C 2700

US Classification:

518710, 518700, 518709, 518713, 518715, 502 38, 502 53, 502 54, 502326, 502331

Abstract:

A process for enhancing metal catalysts for carbon monoxide hydrogenation comprising reducing the catalyst so that at least a portion is in the metallic state, impregnating under a non-oxidative atmosphere with a solution of a salt of at least one metal, optionally in combination with at least one of an ammonium salt, an alkyl ammonium salt, a weak organic acid and ammonia, oxidizing with a gaseous oxidant in the presence of the impregnating solution, and reducing to form an active catalyst. Used catalysts enhanced by the process are initially treated to decrease their hydrocarbon content. The treatment may be carried out in a single reactor, or by carrying out up to all steps after catalyst may be withdrawn from a reactor and returned to at least one reactor, both preferably during operations. Up to all steps may be effected in a subsequent reactor, or in specialized apparatus.

US Patent:

6787496, Sep 7, 2004

Filed:

Jan 29, 2002

Appl. No.:

10/059928

Inventors:

Michel Daage - Baton Rouge LA
Russell John Koveal - Baton Rouge LA
Janet Renee Clark - Baton Rouge LA
David Owen Marler - Baton Rouge LA

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

B01J 3808

US Classification:

502 54, 502 38, 502 53

Abstract:

There is provided a process for renewing the activity of supported metal catalysts for the hydrogenation of carbon monoxide to form a mixture of hydrocarbons comprising decreasing the hydrocarbon content of the catalyst, preferably by contact with hydrogen-containing gas at elevated temperatures, impregnating under a non-oxidizing atmosphere with a solution of at least one of an ammonium salt and an alkyl ammonium salt, optionally in combination with up to five moles of ammonia per liter of solution to the point where it has absorbed a volume of solution equal to at least about 10% of its calculated pore volume; oxidizing the catalyst with a gaseous oxidant in the presence of the impregnating solution and activating the catalyst by reduction with hydrogen at elevated temperatures. Optionally, the catalyst is calcined after the oxidation step, and passivated after the activation step.