Patents by Inventor John Scott Buchanan
John Scott Buchanan 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: 7906685Abstract: In a process for producing cyclohexylbenzene, benzene and hydrogen are fed to at least one reaction zone. The benzene and hydrogen are then contacted in the at least one reaction zone under hydroalkylation conditions with a catalyst system comprising a molecular sieve 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, and at least one hydrogenation metal to produce an effluent containing cyclohexylbenzene. The ratio of the total number of moles of hydrogen fed to said at least one reaction zone to the number of moles of benzene fed to said at least one reaction zone is between 0.4 and 0.9:1.Type: GrantFiled: August 12, 2008Date of Patent: March 15, 2011Assignee: ExxonMobil Chemical Patents Inc.Inventors: Tan-Jen Chen, Francisco M. Benitez, Jane C. Cheng, Jon E. Stanat, John Scott Buchanan
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Publication number: 20110028762Abstract: In a process for producing cyclohexylbenzene, benzene and hydrogen are fed to at least one reaction zone. The benzene and hydrogen are then contacted in the at least one reaction zone under hydroalkylation conditions with a catalyst system comprising a molecular sieve 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, and at least one hydrogenation metal to produce an effluent containing cyclohexylbenzene. The catalyst system has an acid-to-metal molar ratio of from about 75 to about 750.Type: ApplicationFiled: October 14, 2010Publication date: February 3, 2011Inventors: Tan-Jen CHEN, Jane C. Cheng, Terry E. Helton, John Scott Buchanan
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Publication number: 20110008226Abstract: The present invention provides a process for the manufacture of acetylene and other higher hydrocarbons from methane feed using a reverse-flow reactor system, wherein the reactor system includes (i) a first reactor and (ii) a second reactor, the first and second reactors oriented in a series relationship with respect to each other, the process comprising supplying each of first and second reactant through separate channels in the first reactor bed of a reverse-flow reactor such that both of the first and second reactants serve to quench the first reactor bed, without the first and second reactants substantially reacting with each other until reaching the core of the reactor system.Type: ApplicationFiled: September 20, 2010Publication date: January 13, 2011Inventors: Frank Hershkowitz, John Scott Buchanan, Harry W. Deckman, Jeffrey W. Frederick
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Publication number: 20110009681Abstract: The present invention provides a process for the manufacture of acetylene and other higher hydrocarbons from methane feed using a reverse-flow reactor system, wherein the reactor system includes (i) a first reactor and (ii) a second reactor, the first and second reactors oriented in a series relationship with respect to each other, the process comprising supplying each of first and second reactant through separate channels in the first reactor bed of a reverse-flow reactor such that both of the first and second reactants serve to quench the first reactor bed, without the first and second reactants substantially reacting with each other until reaching the core of the reactor system.Type: ApplicationFiled: September 20, 2010Publication date: January 13, 2011Inventors: Frank Hershkowitz, John Scott Buchanan, Harry W. Deckman, Jeffrey W. Frederick
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Patent number: 7847128Abstract: In a process for producing cyclohexylbenzene, benzene and hydrogen are fed to at least one reaction zone. The benzene and hydrogen are then contacted in the at least one reaction zone under hydroalkylation conditions with a catalyst system comprising a molecular sieve 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, and at least one hydrogenation metal to produce an effluent containing cyclohexylbenzene. The catalyst system has an acid-to-metal molar ratio of from about 75 to about 750.Type: GrantFiled: August 12, 2008Date of Patent: December 7, 2010Assignee: ExxonMobil Chemical Patents Inc.Inventors: Tan-Jen Chen, Jane C. Cheng, Terry E. Helton, John Scott Buchanan
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Patent number: 7799962Abstract: This invention relates to a process for the selective alkylation of toluene and/or benzene with an oxygen-containing alkylation agent. In particular, the process uses a selectivated molecular sieve which has been modified by the addition of a hydrogenation component, wherein at least one of the following conditions is met: (a) the selectivated molecular sieve has an alpha value of less than 100 prior to the addition of the hydrogenation component, or (b) the selectivated and hydrogenated catalyst has an alpha value of less than 100. The process of this invention provides high selectivity for the alkylated product while reducing catalyst degradation.Type: GrantFiled: September 10, 2008Date of Patent: September 21, 2010Assignee: ExxonMobil Chemical Patents Inc.Inventors: Jihad Mohammed Dakka, John Scott Buchanan, Robert Andrew Crane, Christine Nicole Elia, Xiaobing Feng, Larry Lee Iaccino, Gary David Mohr, Brenda Anne Raich, Jose′ Guadalupe Santiesteban, Lei Zhang
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Publication number: 20100228047Abstract: In a process for oxidizing a hydrocarbon to the corresponding hydroperoxide, alcohol, ketone, carboxylic acid or dicarboxylic acid, a reaction medium comprising a hydrocarbon is contacted with an oxygen-containing gas in the presence of a catalyst comprising a cyclic imide of the general formula (I): wherein each of R1 and R2 is independently selected from hydrocarbyl and substituted hydrocarbyl radicals having 1 to 20 carbon atoms, or from the groups SO3H, NH2, OH and NO2, or from the atoms H, F, Cl, Br and I provided that R1 and R2 can be linked to one another via a covalent bond; each of Q1 and Q2 is independently selected from C, CH, N, and CR3; each of X and Z is independently selected from C, S, CH2, N, P and an element of Group 4 of the Periodic Table; Y is O or OH; k is 0, 1, or 2; l is 0, 1, or 2; m is 1 to 3; and R3 can be any of the entities listed for R1.Type: ApplicationFiled: October 8, 2008Publication date: September 9, 2010Inventors: Francisco M. Benitez, Jihad M. Dakka, Edmund J. Mozeleski, Stephen Zushma, John Scott Buchanan, Jon E. Stanat
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Publication number: 20100197971Abstract: In a process for producing cyclohexylbenzene, benzene and hydrogen are fed to at least one reaction zone. The benzene and hydrogen are then contacted in the at least one reaction zone under hydroalkylation conditions with a catalyst system comprising a molecular sieve 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, and at least one hydrogenation metal to produce an effluent containing cyclohexylbenzene. The ratio of the total number of moles of hydrogen fed to said at least one reaction zone to the number of moles of benzene fed to said at least one reaction zone is between 0.4 and 0.9:1.Type: ApplicationFiled: August 12, 2008Publication date: August 5, 2010Inventors: Tan-Jen Chen, Francisco M. Benitez, Jane C. Cheng, Jon E. Stanat, John Scott Buchanan
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Publication number: 20100191017Abstract: In a process for producing cyclohexylbenzene, benzene and hydrogen are contacted with a catalyst under hydroalkylation conditions to produce an effluent containing cyclohexylbenzene. The catalyst comprises a composite of a molecular sieve, an inorganic oxide different from said molecular sieve and at least one hydrogenation metal, wherein at least 50 wt % of said hydrogenation metal is supported on the inorganic oxide.Type: ApplicationFiled: July 11, 2008Publication date: July 29, 2010Inventors: Tan-Jen Chen, John Scott Buchanan, Jane Chi-ya Cheng, Terry E. Helton
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Patent number: 7759524Abstract: In a process for producing phenol and methyl ethyl ketone, benzene and a C4 olefin are contacted under alkylation conditions and in the presence of an alkylation catalyst to produce sec-butylbenzene. The sec-butylbenzene is then oxidized to produce an oxidation effluent comprising sec-butylbenzene hydroperoxide and acetophenone. At least part of the sec-butylbenzene hydroperoxide in the oxidation effluent is cleaved to produce phenol and methyl ethyl ketone, while at least part of the acetophenone is hydrogenated to produce at least one of methyl benzyl alcohol, styrene and ethylbenzene.Type: GrantFiled: December 18, 2008Date of Patent: July 20, 2010Assignee: ExxonMobil Research and Engineering CompanyInventors: John Scott Buchanan, Jihad Mohammed Dakka, Stephen Zushma, Francisco Manuel Benitez, Steven E. Silverberg
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Publication number: 20100179351Abstract: In a process for producing cyclohexylbenzene, benzene and hydrogen are fed to at least one reaction zone. The benzene and hydrogen are then contacted in the at least one reaction zone under hydroalkylation conditions with a catalyst system comprising a molecular sieve 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, and at least one hydrogenation metal to produce an effluent containing cyclohexylbenzene. The catalyst system has an acid-to-metal molar ratio of from about 75 to about 750.Type: ApplicationFiled: August 12, 2008Publication date: July 15, 2010Inventors: Tan-Jen Chen, Jane C. Cheng, Terry E. Helton, John Scott Buchanan
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Publication number: 20100040517Abstract: 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: October 22, 2009Publication date: February 18, 2010Inventors: Stephen Harold Brown, John Scott Buchanan
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Patent number: 7655823Abstract: A process is provided for the production of xylenes from reformate. The process is carried out by methylating the benzene, toluene, or both present in the reformate to produce a resulting product having a higher xylenes content than the reformate. Greater than equilibrium amounts of para-xylene can be produced by the process.Type: GrantFiled: February 27, 2006Date of Patent: February 2, 2010Assignee: ExxonMobil Chemical Patents Inc.Inventors: Gary D. Mohr, John Scott Buchanan, Robert A. Crane, Jihad M. Dakka, Xiaobing Feng, Larry L. Iaccino, Shifang L. Luo
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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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Patent number: 7615143Abstract: There is provided a catalyst composition having improved hydrothermal stability for the catalytic cracking of a hydrocarbon feedstock to selectively produce propylene. The catalyst composition comprises a first crystalline molecular sieve selected from the group consisting of IM-5, MWW, ITH, FER, MFS, AEL, and AFO and an effective amount of a stabilization metal (copper, zirconium, or mixtures thereof) exchanged into the molecular sieve. The catalyst finds application in the cracking of naphtha and heavy hydrocarbon feedstocks. When used in the catalytic cracking of heavier hydrocarbon feedstocks, the catalyst composition preferably comprises a second molecular sieve having a pore size that is greater than the pore size of the first molecular sieve. The process is carried out by contacting a feedstock containing hydrocarbons having at least 4 carbon atoms is contacted, under catalytic cracking conditions, with the catalyst composition.Type: GrantFiled: July 30, 2004Date of Patent: November 10, 2009Assignee: ExxonMobil Chemical Patents Inc.Inventors: Tan-Jen Chen, Paul F. Keusenkothen, J. Jason Wu, John Scott Buchanan, Guang Cao, Larry L. Iaccino, David L. Stern, Matthew J. Vincent
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Publication number: 20090216048Abstract: In a process for producing phenol and methyl ethyl ketone, benzene and a C4 olefin are contacted under alkylation conditions and in the presence of an alkylation catalyst to produce sec-butylbenzene. The sec-butylbenzene is then oxidized to produce an oxidation effluent comprising sec-butylbenzene hydroperoxide and acetophenone. At least part of the sec-butylbenzene hydroperoxide in the oxidation effluent is cleaved to produce phenol and methyl ethyl ketone, while at least part of the acetophenone is hydrogenated to produce at least one of methyl benzyl alcohol, styrene and ethylbenzene.Type: ApplicationFiled: December 18, 2008Publication date: August 27, 2009Inventors: John Scott Buchanan, Jihad Mohammed Dakka, Stephen Zushman, Francisco Manuel Benitez, Steven E. Silverberg
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Patent number: 7485763Abstract: In a process for converting C9+ aromatic hydrocarbons to lighter aromatic products a feed comprising C9+ aromatic hydrocarbons is contacted under transalkylation reaction conditions with a catalyst composition comprising (i) a first molecular sieve selected from the group consisting of ZSM-12, mordenite and a porous crystalline inorganic oxide 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; and (ii) a second molecular sieve having a constraint index ranging from 3 to 12. At least the first molecular sieve has a hydrogenation component associated therewith and the first and second molecular sieves are contained in the same catalyst bed. The C9+ aromatic hydrocarbons are converted under the transalkylation reaction conditions to a reaction product containing xylene.Type: GrantFiled: November 3, 2006Date of Patent: February 3, 2009Assignee: ExxonMobil Chemical Patents Inc.Inventors: John Scott Buchanan, Ronald J. Cimini, Robert A. Crane, Wenyih F. Lai, Jose G. Santiesteban, David A. Stachelczyk, David L. Stern, Hye-Kyung C. Timken, William A. Weber
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Publication number: 20090012338Abstract: This invention relates to a process for the selective alkylation of toluene and/or benzene with an oxygen-containing alkylation agent. In particular, the process uses a selectivated molecular sieve which has been modified by the addition of a hydrogenation component, wherein at least one of the following conditions is met: (a) the selectivated molecular sieve has an alpha value of less than 100 prior to the addition of the hydrogenation component, or (b) the selectivated and hydrogenated catalyst has an alpha value of less than 100. The process of this invention provides high selectivity for the alkylated product while reducing catalyst degradation.Type: ApplicationFiled: September 10, 2008Publication date: January 8, 2009Inventors: Jihad Mohammed Dakka, John Scott Buchanan, Robert Andrew Crane, Christine Nicole Elia, Xiaobing Feng, Larry Lee Iaccino, Gary David Mohr, Brenda Anne Raich, Jose' Guadalupe Santiesteban, Lei Zhang
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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: 7453018Abstract: This invention relates to a process for the selective alkylation of toluene and/or benzene with an oxygen-containing alkylation agent. In particular, the process uses a selectivated molecular sieve which has been modified by the addition of a hydrogenation component, wherein at least one of the following conditions is met: (a) the selectivated molecular sieve has an alpha value of less than 100 prior to the addition of the hydrogenation component, or (b) the selectivated and hydrogenated catalyst has an alpha value of less than 100. The process of this invention provides high selectivity for the alkylated product while reducing catalyst degradation.Type: GrantFiled: November 12, 2004Date of Patent: November 18, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Jihad Mohammed Dakka, John Scott Buchanan, Robert Andrew Crane, Christine Nicole Elia, Xiaobing Feng, Larry Lee Iaccino, Gary David Mohr, Brenda Anne Raich, Jose′ Guadalupe Santiesteban, Lei Zhang