Patents by Inventor Stephen Harold Brown
Stephen Harold Brown has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7629498Abstract: This disclosure relates to a process of manufacturing para-xylene, comprising (a) contacting a pygas feedstock and methylating agent with a catalyst under reaction conditions to produce a product having para-xylene, wherein the product has higher para-xylene content than the para-xylene content of the pygas feedstock; and (b) separating the para-xylene from the product of the step (a), wherein the catalyst comprises a molecular sieve having a Diffusion Parameter for 2,2-dimethylbutane of about 0.1-15 sec?1 when measured at a temperature of 120° C. and a 2,2-dimethylbutane pressure of 8 kPa-a and the pygas comprises from about 1 to about 65 wt % benzene and from about 5 to 35 wt % toluene.Type: GrantFiled: June 28, 2007Date of Patent: December 8, 2009Assignee: ExxonMobil Chemical Patents, Inc.Inventors: Stephen Harold Brown, John Scott Buchanan
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Publication number: 20090292152Abstract: The invention relates to series reactor beds containing different oligomerization catalysts and having independent temperature control, and processes for the oligomerization of light olefins to heavier olefins using such series reactor beds.Type: ApplicationFiled: August 4, 2009Publication date: November 26, 2009Inventors: Stephen Harold Brown, Jon Edmond Randoph Stanat, Jose Manuel Vargas, Stephen W. Beadle, Georges Marie K. Mathys, John Stephen Godsmark, Raphael Frans Caers
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Patent number: 7588738Abstract: The invention relates to series reactor beds containing different oligomerization catalysts and having independent temperature control, and processes for the oligomerization of light olefins to heavier olefins using such series reactor beds.Type: GrantFiled: August 23, 2005Date of Patent: September 15, 2009Assignee: ExxonMobil Chemical Patents Inc.Inventors: Stephen Harold Brown, Jon Edmond Randoph Stanat, Jose Manuel Vargas, Stephen W. Beadle, Georges Marie K. Mathys, John Stephen Godsmark, Raphael Frans Caers
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Patent number: 7572947Abstract: The invention is directed to a method of selectively oligomerizing olefin monomers by controlling feedstock composition and reaction conditions. Reaction conditions are chosen to include at least one of: (a) dimer recycle; (b) staged injection of monomer; and (c) utilization of a two catalyst system.Type: GrantFiled: August 7, 2006Date of Patent: August 11, 2009Assignee: ExxonMobil Chemical Patents Inc.Inventors: Stephen Harold Brown, Georges Marie Karel Mathys, Paul Hamilton
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Patent number: 7541507Abstract: Sulphur-containing olefinic feedstocks are oligomerized over zeolite catalysts.Type: GrantFiled: January 9, 2007Date of Patent: June 2, 2009Assignee: Exxonmobil Chemical Patents Inc.Inventors: Jihad Mohammed Dakka, Hans K. T. Goris, Georges M. K. Mathys, Roger Eijkhoudt, Marc P. H. Puttemans, Stephen Harold Brown
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Publication number: 20090134546Abstract: The invention relates to the use of isobutene-containing olefin feedstock in oligomerization reactions, particularly in the production of octenes as feedstock for the manufacture of plasticizer alcohols, the process comprising contacting a feed comprising isobutene with a molecular sieve at a temperature in excess of 240° C. to produce a product low in triple-branched octenes.Type: ApplicationFiled: January 28, 2009Publication date: May 28, 2009Inventors: Stephen Harold Brown, Georges Marie Mathys
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Patent number: 7501548Abstract: The invention relates to the use of isobutene-containing olefin feedstock in oligomerization reactions, particularly in the production of octenes as feedstock for the manufacture of plasticizer alcohols, the process comprising contacting a feed comprising isobutene with a molecular sieve at a temperature in excess of 240° C. to produce a product low in triple-branched octenes.Type: GrantFiled: March 10, 2006Date of Patent: March 10, 2009Assignee: ExxonMobil Chemical Patents Inc.Inventors: Stephen Harold Brown, Georges Marie Mathys
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Publication number: 20090000988Abstract: This disclosure relates to a process of manufacturing para-xylene, comprising (a) contacting a pygas feedstock and methylating agent with a catalyst under reaction conditions to produce a product having para-xylene, wherein the product has higher para-xylene content than the para-xylene content of the pygas feedstock; and (b) separating the para-xylene from the product of the step (a), wherein the catalyst comprises a molecular sieve having a Diffusion Parameter for 2,2-dimethylbutane of about 0.1-15 sec?1 when measured at a temperature of 120° C. and a 2,2-dimethylbutane pressure of 8 kPa-a and the pygas comprises from about 1 to about 65 wt % benzene and from about 5 to 35 wt % toluene.Type: ApplicationFiled: June 28, 2007Publication date: January 1, 2009Inventors: Stephen Harold Brown, John Scott Buchanan
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Patent number: 7414165Abstract: In a process for oligomerizing an olefinic hydrocarbon feedstock comprising sulfur-containing molecules, the feedstock is contacted in the absence of hydrogen with a first metal oxide catalyst at a temperature in excess of 150° C. and then is contacted under olefin oligomerization conditions with a second catalyst comprising a crystalline molecular sieve, such as ZSM-22 or ZSM-57.Type: GrantFiled: June 29, 2007Date of Patent: August 19, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Jihad Mohammed Dakka, Hans K. T. Goris, Georges M. K. Mathys, Stephen Harold Brown, Bruce R. Cook
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Publication number: 20080194890Abstract: A process for producing an cumene product having a purity of at least 99.50 percent based on the weight of cumene present in the product by the propylation of the benzene present in non-extracted hydrocarbon composition feed, e.g., non-extracted reformate. The non-extracted hydrocarbon composition feed is substantially free of both C4? hydrocarbons and the C7+ aromatic hydrocarbons and contains benzene and benzene coboilers. The process is carried out in the liquid phase, in the presence of an acid-active catalyst containing MCM-22 family molecular sieve, and under specified conditions.Type: ApplicationFiled: February 12, 2007Publication date: August 14, 2008Inventor: Stephen Harold Brown
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Publication number: 20070213575Abstract: Nitrogen-containing Lewis bases act as poisons for molecular sieve catalysts used in oligomerisation reactions. A lowering of their presence in the feed prior to the contacting thereof with the molecular sieve brings a significant extension of catalyst life. Excessive elimination of these poisons may be disadvantageous. Lowering the levels of these catalyst poisons to more manageable concentrations is therefore preferred.Type: ApplicationFiled: February 1, 2007Publication date: September 13, 2007Inventors: John Stephen Godsmark, Georges Marie Karel Mathys, Hubertus Joseph Beckers, Charles Morris Yarbrough, Stephen Harold Brown, Yeo-Meng Lim
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Patent number: 7253330Abstract: In a process for oligomerizing an olefinic hydrocarbon feedstock comprising sulfur-containing molecules, the feedstock is contacted in the absence of hydrogen with a first metal oxide catalyst at a temperature in excess of 150° C. and then is contacted under olefin oligomerization conditions with a second catalyst comprising a crystalline molecular sieve, such as ZSM-22 or ZSM-57.Type: GrantFiled: April 29, 2003Date of Patent: August 7, 2007Assignee: ExxonMobil Chemical Patents Inc.Inventors: Jihad Mohammed Dakka, Hans K. T. Goris, Georges M. K. Mathys, Stephen Harold Brown, Bruce R. Cook
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Patent number: 7186874Abstract: Sulphur-containing olefinic feedstocks are oligomerized over zeolite catalysts.Type: GrantFiled: October 23, 2002Date of Patent: March 6, 2007Assignee: ExxonMobil Chemical Patents Inc.Inventors: Jihad Mohammed Dakka, Hans K. T. Goris, Georges M. K. Mathys, Roger Eijkhoudt, Marc P. H. Puttemans, Stephen Harold Brown
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Patent number: 7183450Abstract: This invention is to a method of oligomerizing an olefin feed stream. The olefin feed stream contains at least one C2 to C12 olefin to obtain an olefin feed stream and has from about 1,000 ppm to about 10 percent by weight oxygenated hydrocarbon. The olefin is oligomerized by contacting with an acid based oligomerization catalyst.Type: GrantFiled: July 22, 2002Date of Patent: February 27, 2007Assignee: ExxonMobil Chemical Patents Inc.Inventors: Stephen Harold Brown, Georges M. K. Mathys
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Patent number: 7084319Abstract: The present invention provides various processes for fluidizing molecular sieve catalyst compositions in a fluidized bed reaction system. The invention comprises fluidizing a molecular sieve catalyst composition with a reactive fluidizing medium under conditions effective to convert at least a portion of the fluidizing medium to additional product. The invention is ideally suited for implementation into an oxygenate to olefin reaction system, in which the fluidizing medium optionally comprises byproducts of the oxygenate to olefin conversion reaction.Type: GrantFiled: December 5, 2003Date of Patent: August 1, 2006Assignee: ExxonMobil Chemical Patents Inc.Inventors: Keith Holroyd Kuechler, Nicolas P. Coute, Jeffrey Scott Smith, Stephen Harold Brown, Richard B. Hall, Teng Xu, Stephen Nell Vaughn
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Patent number: 6936744Abstract: The present invention provides a process for producing a monoalkylated aromatic compound, particularly cumene, comprising the step of contacting a polyalkylated aromatic compound with an alkylatable aromatic compound under at least partial liquid phase conditions and in the presence of a transalkylation catalyst to produce the monoalkylated aromatic compound, wherein the transalkylation catalyst comprises a mixture of at least two different crystalline molecular sieves, wherein each of said molecular sieves is selected from zeolite beta, zeolite Y, mordenite and a material having an X-ray diffraction pattern including d-spacing maxima at 12.4±0.25, 6.9±0.15, 3.57±0.07 and 3.42±0.07 Angstrom.Type: GrantFiled: July 19, 2000Date of Patent: August 30, 2005Assignee: ExxonMobil Chemical Patents, Inc.Inventors: Jane Chi Ya Cheng, Michael Alan Steckel, Charles Morris Smith, William Alois Weber, Stephen Harold Brown, Ajit Bhaskar Dandekar, Michael Alan Better
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Publication number: 20040220440Abstract: In a process for oligomerizing an olefinic hydrocarbon feedstock comprising sulfur-containing molecules, the feedstock is contacted in the absence of hydrogen with a first metal oxide catalyst at a temperature in excess of 150° C. and then is contacted under olefin oligomerization conditions with a second catalyst comprising a crystalline molecular sieve, such as ZSM-22 or ZSM-57.Type: ApplicationFiled: April 29, 2003Publication date: November 4, 2004Inventors: Jihad Mohammed Dakka, Hans K.T. Goris, Georges M.K. Mathys, Stephen Harold Brown, Bruce R. Cook
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Publication number: 20040015028Abstract: This invention is to a method of oligomerizing an olefin feed stream. The olefin feed stream contains at least one C2 to C12 olefin to obtain an olefin feed stream and has from about 1,000 ppm to about 10 percent by weight oxygenated hydrocarbon. The olefin is oligomerized by contacting with an acid based oligomerization catalyst.Type: ApplicationFiled: July 22, 2002Publication date: January 22, 2004Inventors: Stephen Harold Brown, Georges M.K. Mathys
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Patent number: 6048816Abstract: 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.Type: GrantFiled: April 6, 1998Date of Patent: April 11, 2000Assignee: Mobil Oil CorporationInventors: Stephen Harold Brown, Larry A. Green, Mark Fischer Mathias, David H. Olson, Robert Adams Ware, William A. Weber
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Patent number: 6046372Abstract: 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.Type: GrantFiled: April 6, 1998Date of Patent: April 4, 2000Assignee: Mobil Oil CorporationInventors: Stephen Harold Brown, Larry A. Green, Mark Fischer Mathias, David H. Olson, Robert Adams Ware, William A. Weber