Stephen A Vaughn

US Patent:

6440894, Aug 27, 2002

Filed:

Jun 25, 2001

Appl. No.:

09/891674

Inventors:

Luc R. Martens - Meise, BE
Stephen N. Vaughn - Kingwood TX
Albert E. Schweizer - Baton Rouge LA
John K. Pierce - Houston TX

Assignee:

ExxonMobil Chemical Patents, Inc. - Houston TX

International Classification:

B01J 2714

US Classification:

502214, 502208

Abstract:

Methods of calcining non-zeolitic molecular sieve catalyst to remove most, if not nearly all, of halogen contained in the catalyst. One method includes heating the catalyst in a low moisture environment, followed by contacting the heated catalyst with air and/or steam. Another method includes steam-treating the catalyst at a temperature from 400Â C. to 1000Â C. The calcination methods provides a catalyst that contains from about 10 ppmw to about 600 ppmw chlorine, preferably 10 ppmw to about 200 ppmw chlorine, more preferably 10 ppmw to about 80 ppmw chlorine.

US Patent:

6444868, Sep 3, 2002

Filed:

Mar 8, 2000

Appl. No.:

09/521175

Inventors:

Stephen N. Vaughn - Kingwood TX
Peter G. Ham - Houston TX
Keith H. Kuechler - Friendswood TX

Assignee:

Exxon Mobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 1207

US Classification:

585640, 585311, 585312, 585313, 585324, 585638, 585639

Abstract:

A method for converting heavy olefins present in a product stream exiting a first reaction zone into light olefins and carbonaceous deposits on a catalyst without separation of the heavy olefins from the product stream exiting the first reaction zone. The method comprises creating the product stream exiting the first reaction zone, the product stream exiting the first reaction zone comprising the heavy olefins, moving the product stream exiting the first reaction zone to a second reaction zone without separation of the heavy olefins from the product stream exiting the first reaction zone, and contacting the product stream exiting the first reaction zone with the catalyst under conditions effective to form the light olefins, the contacting causing the carbonaceous deposits to form on at least a portion of the catalyst.

US Patent:

6448460, Sep 10, 2002

Filed:

Mar 14, 2001

Appl. No.:

09/805215

Inventors:

Marcel J. G. Janssen - Kessel-Lo, BE
Machteld M. Mertens - Boortmeerbeek, BE
Cornelius W. M. Van Oorschot - Brasschaat, BE
Stephen N. Vaughn - Kingwood TX
David R. Lumgair - Kingwood TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 120

US Classification:

585638, 585639, 585640

Abstract:

This invention is directed to a molecular sieve having acid catalyst sites and a method of maintaining the acid catalyst sites of a template-containing silicoaluminophosphate molecular sieve. The method comprises providing a template-containing silicoaluminophosphate molecular sieve and heating the molecular sieve in an oxygen depleted environment under conditions effective to maintain or preserve the number of acid catalyst sites. The heated molecular sieve exhibits at least one peak in the infrared region in a range of from 3630 cm to 3580 cm. Preferably, the heated molecular sieve exhibits a combined peak area in the 3630 cm to 3580 cm range of at least 10% of a total peak area of all peaks in an infrared region between 4000 cm to 3400 cm.

US Patent:

6455749, Sep 24, 2002

Filed:

Oct 3, 1997

Appl. No.:

08/943399

Inventors:

Stephen Neil Vaughn - Kingwood TX

Assignee:

ExxonMobil Chemical Patents, Inc. - Houston TX

International Classification:

C07C 100

US Classification:

585640, 585638, 585639, 585324

Abstract:

A method for increasing light olefin yield during conversion of oxygenates to olefins comprising: contacting an oxygenate feed in a primary reactor with a non-zeolitic molecular sieve catalyst under conditions effective to produce a first product comprising light olefins; separating the first product into light olefins and a heavy hydrocarbon fraction; feeding the heavy hydrocarbon fraction either back into the primary reactor or to a separate auxiliary reactor; and, subjecting the heavy hydrocarbon fraction to conditions effective to convert at least a portion of the heavy hydrocarbons to light olefins.

US Patent:

6509290, Jan 21, 2003

Filed:

Jul 17, 2000

Appl. No.:

09/617714

Inventors:

Stephen N. Vaughn - Kingwood TX
Luc R. M. Martens - Meise, BE
Keith H. Kuechler - Friendswood TX
Albert E. Schweizer - Baton Rouge LA

Assignee:

Exxon Mobil Chemical Patents, Inc. - Houston TX

International Classification:

B01J 27182

US Classification:

502214, 502 63, 423DIG 30

Abstract:

Disclosed is a molecular sieve catalyst which contains molecular sieve-containing attrition particles and virgin molecular sieve, the attrition particles having been recycled from a catalyst manufacture process or from a reaction system. The catalyst can be used in a variety of catalytic reaction processes. A desired process is making olefins from an oxygenate feedstock. The recovery and use of the attrition particles in the catalyst is beneficial in minimizing waste, thereby reducing problems relating to both environmental and economic constraints.

US Patent:

6521562, Feb 18, 2003

Filed:

Sep 28, 2000

Appl. No.:

09/672469

Inventors:

Kenneth R. Clem - Humble TX
Luc R. M. Martens - Meise, BE
Stephen N. Vaughn - Kingwood TX
Paul R. Stafford - Anderson SC
John W. Kress - Seneca SC
Machteld M. Mertens - Boortmeerbeek, BE

Assignee:

ExxonMobil Chemical Patents, Inc. - Houston TX

International Classification:

B01J 27182

US Classification:

502214, 502 64, 502 65, 502 66, 502208, 502209, 502210, 502211, 502212, 502213

Abstract:

A method of making a molecular sieve catalyst by preparing a catalyst slurry containing molecular sieve, binder and a matrix material and directing the slurry to a forming unit. The catalyst slurry is prepared by using a microfiltration process whereby the molecular sieve is washed and concentrated from a preparation medium without having to isolate the molecular sieve in a dry or semi-dry form. The catalyst is used to make ethylene and propylene from an oxygenate.

US Patent:

6541415, Apr 1, 2003

Filed:

Jun 27, 2001

Appl. No.:

09/894158

Inventors:

Stephen N. Vaughn - Kingwood TX
Luc R. M. Martens - Meise, BE
Keith H. Kuechler - Friendswood TX
Albert E. Schweizer - Midland MI

Assignee:

ExxonMobil Chemical Patents, Inc. - Houston TX

International Classification:

B01J 27182

US Classification:

502214, 502 20, 502 63, 502 67, 502514

Abstract:

Disclosed is a molecular sieve catalyst which contains molecular sieve-containing attrition particles and virgin molecular sieve, the attrition particles having been recycled from a catalyst manufacture process or from a reaction system. The catalyst can be used in a variety of catalytic reaction processes. A desired process is making olefins from an oxygenate feedstock. The recovery and use of the attrition particles in the catalyst is beneficial in minimizing waste, thereby reducing problems relating to both environmental and economic constraints.

US Patent:

6605749, Aug 12, 2003

Filed:

Jan 15, 2003

Appl. No.:

10/342601

Inventors:

Stephen N. Vaughn - Kingwood TX
Luc R. M. Martens - Meise, BE
Keith H. Kuechler - Friendswood TX
Albert E. Schweizer - Midland MI

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 100

US Classification:

585640, 585638, 585639

Abstract:

Disclosed is a molecular sieve catalyst which contains molecular sieve-containing attrition particles and virgin molecular sieve, the attrition particles having been recycled from a catalyst manufacture process or from a reaction system. The catalyst can be used in a variety of catalytic reaction processes. A desired process is making olefins from an oxygenate feedstock. The recovery and use of the attrition particles in the catalyst is beneficial in minimizing waste, thereby reducing problems relating to both environmental and economic constraints.