Mark A Mathias

US Patent:

6423879, Jul 23, 2002

Filed:

Nov 15, 1999

Appl. No.:

09/341008

Inventors:

Stephen H. Brown - Princeton NJ
Mark F. Mathias - Pittsford NY
Robert A. Ware - Wyndmoor PA
David H. Olson - Pennington NJ

Assignee:

ExxonMobil Oil Corporation - Fairfax VA

International Classification:

C07C 120

US Classification:

585467, 585469, 502 60, 502 65, 502 71, 502 73, 502 77, 502 85, 502245

Abstract:

There is provided a process for the selective production of para-xylene which comprises reacting toluene with methanol in the presence of a catalyst comprising a porous crystalline material having a Diffusion Parameter for 2,2 dimethylbutane of about 0. 1-15 sec when measured at a temperature of 120Â C. and a 2,2 dimethylbutane pressure of 60 torr (8 kPa). The porous crystalline material is preferably a medium-pore zeolite, particularly ZSM-5, which has been severely steamed at a temperature of at least 950Â C. The porous crystalline material is preferably combined with at least one oxide modifier, preferably including phosphorus, to control reduction of the micropore volume of the material during the steaming step.

US Patent:

6504072, Jan 7, 2003

Filed:

May 8, 2002

Appl. No.:

10/141159

Inventors:

Stephen H. Brown - Princeton NJ
Mark F. Mathias - Pittsford NY
Robert A. Ware - Wyndmoor PA
David H. Olson - Pennington NJ

Assignee:

ExxonMobil Oil Corporation - Fairfax VA

International Classification:

C07C 268

US Classification:

585467, 585464

Abstract:

There is provided a process for the selective production of para-xylene which comprises reacting toluene with methanol in the presence of a catalyst comprising a porous crystalline material having a Diffusion Parameter for 2,2 dimethylbutane of about 0. 1-15 sec when measured at a temperature of 120Â C. and a 2,2 dimethylbutane pressure of 60 torr (8 kPa). The porous crystalline material is preferably a medium-pore zeolite, particularly ZSM-5, which has been severely steamed at a temperature of at least 950Â C. The porous crystalline material is preferably combined with at least one oxide modifier, preferably including phosphorus, to control reduction of the micropore volume of the material during the steaming step.

US Patent:

55914179, Jan 7, 1997

Filed:

Jan 21, 1994

Appl. No.:

8/184536

Inventors:

John S. Buchanan - Trenton NJ
Mark F. Mathias - Turnersville NJ
Joseph F. Sodomin - Landenberg PA
Gerald J. Teitman - Vienna VA

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

B01D 5346
B01D 5381
B01D 5396

US Classification:

423210

Abstract:

Removing sulfur oxide, carbon monoxide and nitrogen oxide in a flue gas stream by combusting fuel in the combustor with a reduced amount of oxygen to convert all sulfur-containing species in the flue gas stream to sulfur oxide, and to partially convert carbon monoxide therein to carbon dioxide, thus forming a sulfur oxide enriched gas stream having between at least about 500 ppm carbon monoxide and a consequential reduced amount of nitrogen oxide. The sulfur oxide enriched gas stream is contacted with a solid adsorbent bed for adsorbing the sulfur oxides in the form of inorganic sulfates and/or sulfur oxides. The solid adsorbent contains a catalytic oxidation promoter for oxidizing the carbon monoxide gas stream to carbon dioxide, thus forming a sulfur oxide and carbon monoxide depleted stream with the consequential reduced amount of nitrogen oxide for disposal. The adsorbent bed is then contacted with a reducing gas stream for regenerating the adsorbent bed to form a hydrogen sulfide and/or sulfur dioxide bearing stream.

US Patent:

55476481, Aug 20, 1996

Filed:

May 5, 1995

Appl. No.:

8/435914

Inventors:

John S. Buchanan - Trenton NJ
Mark F. Mathias - Turnersville NJ
Joseph F. Sodomin - Landenberg PA
Gerald J. Teitman - Vienna VA

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

B01D 5346
B01D 5381
B01D 5396

US Classification:

423210

Abstract:

Removing sulfur oxide and carbon monoxide in a flue gas stream by combusting fuel in the combustor with a reduced amount of oxygen to partially convert carbon monoxide therein to carbon dioxide and sufficient to convert all sulfur-containing species in the flue gas stream to sulfur oxide and thus form a sulfur oxide enriched gas stream having between at least about 500 ppm carbon monoxide. The sulfur oxide enriched gas stream is contacted with a solid adsorbent bed for adsorbing the sulfur oxides in the form of inorganic sulfates and/or sulfur oxides. The solid adsorbent contains a catalytic oxidation promoter for oxidizing the carbon monoxide gas stream to carbon dioxide, thus forming a sulfur oxide and carbon monoxide depleted stream for disposal. The adsorbent bed is then contacted with a reducing gas stream for regenerating the adsorbent bed to form a hydrogen sulfide and/or sulfur dioxide bearing stream.

US Patent:

52680894, Dec 7, 1993

Filed:

Jun 24, 1992

Appl. No.:

7/903406

Inventors:

Amos A. Avidan - Yardley PA
Mark F. Mathias - Turnersville NJ
Raghu K. Menon - Medford NJ
Joseph F. Sodomin - Centerville VA
Scott A. Stevenson - Newton PA
Gerald J. Teitman - Vienna VA

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

C10G 1118
C10G 1105
B01J 3836
B01J 2938

US Classification:

208113

Abstract:

Oxides of nitrogen (NO. sub. x) emissions from an FCC regenerator are reduced by forcing the regenerator to operate between full and partial CO burn mode. Operating with less than 1 mole % O2 and up to 1 or 2% CO in the flue gas creates conditions which oxidize nitrogen compounds in coke on spent catalyst to NOx, and simultaneously convert NOx in the regenerator to nitrogen. A downstream CO boiler can burn this low CO flue gas without producing large amounts of NOx. Most NOx emissions can be eliminated. An apparatus, with the regenerator air:coke ratio controlled by both CO and O2 analyzers monitoring regenerator flue gas, is also disclosed.

US Patent:

60463724, Apr 4, 2000

Filed:

Apr 6, 1998

Appl. No.:

9/055486

Inventors:

Stephen Harold Brown - Princeton NJ
Larry A. Green - Mickleton NJ
Mark Fischer Mathias - Pittsford NY
David H. Olson - Pennington NJ
Robert Adams Ware - Wyndmoor PA
William A. Weber - Marlton NJ

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

C07C 100

US Classification:

585640

Abstract:

There is provided a process for converting methanol and/or dimethyl ether to a product containing C. sub. 2 to C. sub. 4 olefins which comprises the step of contacting a feed which contains methanol and/or dimethyl ether with a catalyst comprising a porous crystalline material, said contacting step being conducted in the presence of an aromatic compound under conversion conditions including a temperature of 350. degree. C. to 480. degree. C. and a methanol partial pressure in excess of 10 psia (70 kPa), said porous crystalline material having a pore size greater than the critical diameter of the aromatic compound and the aromatic compound being capable of alkylation by the methanol and/or dimethyl ether under said conversion conditions.

US Patent:

61569496, Dec 5, 2000

Filed:

Dec 28, 1998

Appl. No.:

9/221548

Inventors:

Stephen H. Brown - Princeton NJ
Mark F. Mathias - Pittsford NY

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

C07C 266

US Classification:

585449

Abstract:

There is provided a process for shape selective xylene methylation that involves contacting a feedstream which includes xylene and methanol under alkylation conditions, with a low activity catalyst. Xylene conversions of at least 15% at methanol utilization levels of 25% or greater are achieved by sequential injection of methanol The xylene methylation process has a selectivity for pseudocumene of over 85% and up to 99%, with a pseudocumene:durene ratio of up to 20 or more.

US Patent:

60488166, Apr 11, 2000

Filed:

Apr 6, 1998

Appl. No.:

9/055478

Inventors:

Stephen Harold Brown - Princeton NJ
Larry A. Green - Mickleton NJ
Mark Fischer Mathias - Pittsford NY
David H. Olson - Pennington NJ
Robert Adams Ware - Wyndmoor PA
William A. Weber - Marlton NJ

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

B01J 2900

US Classification:

502 77

Abstract:

There is provided a catalyst and a process for converting methanol or dimethyl ether to a product containing C. sub. 2 to C. sub. 4 olefins. The catalyst comprises a porous crystalline material having a Diffusion Parameter for 2,2-dimethylbutane of about 0. 1-20 sec. sup. -1 when measured at a temperature of 120. degree. C. and a 2,2-dimethylbutane pressure of 60 torr (8 kPa). In addition, the catalyst is characterized by a hydrothermal stability such that, after steaming the catalyst at 1025. degree. C. for 45 minutes in 1 atmosphere steam, the catalyst exhibits a methanol conversion activity of at least 50% when contacted with methanol at a methanol partial pressure of 1 atmosphere, a temperature of 430. degree. C. and 0. 5 WHSV. The porous crystalline material is preferably a medium-pore zeolite, particularly ZSM-5, which contains phosphorus and has been severely steamed at a temperature of at least 950. degree. C.