Stephen Bradley Vaughn

US Patent:

6437208, Aug 20, 2002

Filed:

Jan 11, 2000

Appl. No.:

09/481364

Inventors:

Keith H. Kuechler - Friendswood TX
Marcel J. G. Janssen - Kessel-Lo, BE
Stephen N. Vaughn - Kingwood TX
Shun C. Fung - Bridgewater NJ
Nicolas P. Coute - Houston TX
Jeffrey Scott Smith - Seabrook TX
James R. Lattner - Seabrook TX
Jeffrey L. White - Kingwood TX
Teng Xu - Houston TX
Machteld M. Mertens - Boortmeerbeek, BE
Cornelius W. M. Van Oorschot - Braschaat, BE

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 120

US Classification:

585640, 585639

Abstract:

Disclosed is a method for making olefin product from an oxygenate-containing feedstock. In the method, a silicoaluminophosphate molecular sieve catalyst is contacted with the oxygenate-containing feedstock in a reactor at an average catalyst feedstock exposure index of at least 1. The method produces lower coke yield and provides an olefin product which is low in C -C paraffin content. The invention is particularly effective in producing an olefin product having a very low propane content.

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:

6441261, Aug 27, 2002

Filed:

Jul 28, 2000

Appl. No.:

09/627634

Inventors:

Keith H. Kuechler - Friendswood TX
Stephen N. Vaughn - Kingwood TX
Gary F. Janda - Houston TX
Russell D. Sellen - Baytown TX

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 100

US Classification:

585639, 585640, 585642

Abstract:

This invention relates to a method for converting an oxygenate feedstock to an olefin product. In particular, this invention relates to a method for converting an oxygenate feedstock, including a diluent co-feed, to an olefin product, by contacting the feedstock with a silicoaluminophosphate catalyst at a high total pressure of the feedstock while maintaining a low partial pressure of the oxygenates undergoing reaction.

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:

6455747, Sep 24, 2002

Filed:

Oct 7, 1999

Appl. No.:

09/414256

Inventors:

James R. Lattner - Seabrook TX
Stephen N. Vaughn - Kingwood TX
Keith H. Kuechler - Friendswood TX
David C. Skouby - Succasunna NJ

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 170

US Classification:

585638, 585639, 585640, 585327, 585328, 585329

Abstract:

The present invention provides a method for converting a feed containing oxygenates to olefins and comprises the following steps: providing a feed including an oxygenate; contacting the feed in a reactor apparatus with a catalyst including a molecular sieve, the contacting taking place under conditions effective to convert the oxygenate to a product including a light olefin, the conditions including a gas superficial velocity of at least two meters per second; and recirculating a first portion of the catalyst to recontact the feed.

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.