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: 10843981Abstract: The invention relates to catalytic aromatization, e.g., for the conversion of non-aromatic hydrocarbon to higher-value aromatic hydrocarbon, to catalysts useful for such aromatization, to methods for making such catalysts, and to systems and apparatus for carrying out aromatization in the presence of the catalyst.Type: GrantFiled: March 27, 2017Date of Patent: November 24, 2020Assignee: ExxonMobil Chemical Patents Inc.Inventors: Paul F. Keusenkothen, Samia Ilias, John Scott Buchanan, Mayank Shekhar, Reyyan Koc-Karabocek, Teng Xu
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Publication number: 20170305812Abstract: The invention relates to catalytic aromatization, e.g., for the conversion of non-aromatic hydrocarbon to higher-value aromatic hydrocarbon, to catalysts useful for such aromatization, to methods for making such catalysts, and to systems and apparatus for carrying out aromatization in the presence of the catalyst.Type: ApplicationFiled: March 27, 2017Publication date: October 26, 2017Inventors: Paul F. Keusenkothen, Samia IIias, John Scott Buchanan, Mayank Shekhar, Reyyan Koc-Karabocek, Teng Xu
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Patent number: 9029621Abstract: A process for oligomerizing isobutene comprises contacting a feedstock comprising isobutene with a catalyst comprising a MCM-22 family molecular sieve under conditions effective to oligomerize the isobutene, wherein said conditions including a temperature from about 45° C. to less than 140° C. The isobutene may be a component of a hydrocarbon feedstock containing at least one additional C4 alkene. In certain aspects, isobutene oligomers are separated from a first effluent of the oligomerization to produce a second effluent comprising at least one n-butene. The second effluent can be contacted with an alkylation catalyst to produce sec-butylbenzene.Type: GrantFiled: October 2, 2008Date of Patent: May 12, 2015Assignee: ExxonMobil Chemical Patents Inc.Inventors: John Scott Buchanan, Jane Chi-Ya Cheng, Jihad Mohammed Dakka, Jon Edmond Stanat
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Patent number: 8754276Abstract: A reverse flow regenerative reactor having first and second zones, each having first and second ends, the first zone having a plurality of channels capable of separately conveying at least two components of a combustible gas mixture, a gas distributor configured for injecting the components of the combustible gas mixture into first zone, a combustion zone including a selective combustion catalyst disposed at or downstream of the second end of said channels for catalyzing combustion, wherein the second zone is positioned and situated to receive a combusted gas mixture. Processes usefully conducted in the reactor are also disclosed.Type: GrantFiled: August 10, 2012Date of Patent: June 17, 2014Assignee: ExxonMobil Research and Engineering CompanyInventors: John Scott Buchanan, Stephen Mark Davis, Frank Hershkowitz, John Slocum Coleman, Seth McConkie Washburn
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Publication number: 20140163285Abstract: A process of catalytically cracking a feedstock based on a biocomponent contacts the feedstock with a catalytic cracking catalyst comprising a basic metal oxide on a porous oxide support at an elevated cracking temperature to eliminate oxygen from the biocomponent to form cracked hydrocarbon residues. The basic metal oxide of the cracking catalyst is preferably a metal oxide of Group 2 of the Periodic Table (IUPAC) such as calcium or magnesium on a support comprised of a non-acidic form of alumina such as gibbsite or boehmite. Preferred feedstocks are those based on triglycerides, especially vegetable oils, animal fats and algae oils.Type: ApplicationFiled: November 8, 2013Publication date: June 12, 2014Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: John Scott Buchanan, Halou Oumar-Mahamat, Wayne Richard Kliewer
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Patent number: 8658836Abstract: 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: GrantFiled: October 8, 2008Date of Patent: February 25, 2014Assignee: ExxonMobil Chemical Patents Inc.Inventors: Francisco M. Benitez, Jihad M. Dakka, Edmund J. Mozeleski, Stephen Zushma, John Scott Buchanan, Jon E. Stanat
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Publication number: 20140046107Abstract: A reverse flow regenerative reactor having first and second zones, each having first and second ends, the first zone having a plurality of channels capable of separately conveying at least two components of a combustible gas mixture, a gas distributor configured for injecting the components of the combustible gas mixture into first zone, a combustion zone including a selective combustion catalyst disposed at or downstream of the second end of said channels for catalyzing combustion, wherein the second zone is positioned and situated to receive a combusted gas mixture. Processes usefully conducted in the reactor are also disclosed.Type: ApplicationFiled: August 10, 2012Publication date: February 13, 2014Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: John Scott Buchanan, Stephen Mark Davis, Frank Hershkowitz, John Slocum Coleman, Seth McConkie Washburn
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Patent number: 8455707Abstract: 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: GrantFiled: September 20, 2010Date of Patent: June 4, 2013Assignee: ExxonMobil Chemical Patents Inc.Inventors: Frank Hershkowitz, John Scott Buchanan, Harry W. Deckman, Jeffrey W. Frederick
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Patent number: 8454911Abstract: 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: GrantFiled: September 20, 2010Date of Patent: June 4, 2013Assignee: ExxonMobil Chemical Patents Inc.Inventors: Frank Hershkowitz, John Scott Buchanan, Harry W. Deckman, Jeffrey W. Frederick
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Publication number: 20130131419Abstract: A fluid catalytic cracking catalyst exhibiting reduced coke make comprises a zeolite cracking component in a matrix of gibbsite having a median particle size of not more than 0.4 microns and preferably not more than 0.3 microns. The zeolite cracking component will normally be a faujasite, with preference to zeolite Y in its various forms such as Y, HY, REY, REHY, USY, REUSY and secondary zeolite additives may be present, including ZSM-5.Type: ApplicationFiled: November 22, 2011Publication date: May 23, 2013Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: John Scott Buchanan, William A. Wachter, Kun Wang, Kathryn L. Peretti, Daniel Mark Giaquinta, Hongyi Hou
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Patent number: 8277639Abstract: The invention is directed to a process comprising feeding high TAN feedstreams to a steam cracker, whereby naphthenic acids in the feedstreams are substantially converted to CO, CO2, and low amounts of smaller acids (e.g., formic, acetic, propionic, and butyric acids). The feedstream is preferably a high TAN feedstream comprising crude or high TAN feedstream which has previously been subjected to a refinery process to remove resid.Type: GrantFiled: September 20, 2005Date of Patent: October 2, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: John Scott Buchanan, Paul F. Keusenkothen, Stephen Harold Brown, Julian A. Wolfenbarger, James Earl Graham, James N. McCoy
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Publication number: 20120103870Abstract: This disclosure relates to devices, e.g., baffle plate and combination dipleg valve/baffle devices, for use in achieving rapid disengagement of entrained hydrocarbons vapors, especially in high flux spent catalyst flow exiting from a cyclone separator dipleg in a fluidized catalytic cracking (FCC) unit. The baffle plate is preferably located near and typically below the catalyst dipleg of a fluid catalytic cracking reactor or separation zone and comprises a baffle plate body member having a surface, and in preferred embodiments also includes one or more apertures located on at least a portion of the surface. The valve/baffle is located at the outlet of the catalyst dipleg and comprises a combination valve and catalyst baffle in which the valve/baffle is designed to allow the top surface of the valve/baffle to seat against the dipleg outlet until the weight of the catalyst above the valve/baffle forces it to open.Type: ApplicationFiled: October 26, 2011Publication date: May 3, 2012Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANYInventors: John Scott Buchanan, Steven S. Lowenthal, George A. Swan, III, James O. Guerra
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Patent number: 8076524Abstract: The present invention relates to a method for preparing olefin comonomers from ethylene. The comonomer generated can be used in a subsequent process, such as a polyethylene polymerization reactor. The comonomer generated can be transported, optionally without isolation or storage, to a polyethylene polymerization reactor. One method includes the steps of: feeding ethylene and a catalyst in a solvent/diluent to one or more comonomer synthesis reactors; reacting the ethylene and the catalyst under reaction conditions sufficient to produce an effluent comprising a desired comonomer; forming a gas stream comprising unreacted ethylene, and a liquid/bottoms stream comprising the comonomer, optionally by passing the effluent to one or more downstream gas/liquid phase separators; and purifying at least a portion of said liquid/bottoms stream by removing at least one of solid polymer, catalyst, and undesirable olefins therefrom.Type: GrantFiled: January 17, 2007Date of Patent: December 13, 2011Assignee: ExxonMobil Chemical Patents Inc.Inventors: James R. Lattner, John F. Walzer, Jr., Krishnan Sankaranarayanan, John Scott Buchanan, Milind Bholanath Ajinkya, Stephen M Wood, Anastasios I Skoulidas, Jay L Reimers, Timothy Daniel Shaffer
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Publication number: 20110282120Abstract: A process for oligomerizing isobutene comprises contacting a feedstock comprising isobutene with a catalyst comprising a MCM-22 family molecular sieve under conditions effective to oligomerize the isobutene, wherein said conditions including a temperature from about 45° C. to less than 140° C. The isobutene may be a component of a hydrocarbon feedstock containing at least one additional C4 alkene.Type: ApplicationFiled: October 2, 2008Publication date: November 17, 2011Inventors: John Scott Buchanan, Jane Chi-Ya Cheng, Jihad Mohammed Dakka, Jon Edmond Stanat
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Patent number: 8048388Abstract: 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: October 22, 2009Date of Patent: November 1, 2011Assignee: ExxonMobil Chemical Patents Inc.Inventors: Stephen Harold Brown, John Scott Buchanan
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Patent number: 8003839Abstract: The present invention relates to an in-line method for generating comonomer, from monomer, such as ethylene. The comonomer generated is stored prior to transporting to a polyethylene polymerization reactor. The in-line method includes the steps of providing an in-line comonomer synthesis reactor and a downstream gas/liquid phase separator prior to the polymerization reactor; feeding ethylene monomer and a catalyst in a solvent and/or diluent to the comonomer synthesis reactor; reacting the ethylene monomer and the catalyst in solvent and/or diluent under reaction conditions to produce an effluent stream including ethylene monomer and comonomer; passing the effluent stream from the comonomer synthesis reactor to the downstream gas/liquid phase separator to separate a gas stream from a bottom stream, wherein the gas stream is a mixture of ethylene monomer and comonomer; and passing the gas stream to the polymerization reactor to provide the necessary comonomer input.Type: GrantFiled: September 8, 2006Date of Patent: August 23, 2011Assignee: Exxonmobil Chemical Patents Inc.Inventors: John Scott Buchanan, Krishnan Sankaranarayanan, Milind B. Ajinkya, Stephen M. Wood, Anastasios I. Skoulidas, James R. Lattner, John F. Walzer
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Patent number: 7982085Abstract: The present invention relates to an in-line method for generating comonomer from monomer, such as ethylene. The comonomer generated is directly transported, without isolation or storage, to a polyethylene polymerization reactor. The in-line method includes the steps of providing an in-line comonomer synthesis reactor and a downstream gas/liquid phase separator prior to the polymerization reactor; feeding ethylene monomer and a catalyst in a solvent and/or diluent to the comonomer synthesis reactor; reacting the ethylene monomer and the catalyst in solvent and/or diluent under reaction conditions to produce an effluent stream including ethylene monomer and comonomer; passing the effluent stream from the comonomer synthesis reactor to the downstream gas/liquid phase separator to separate a gas stream from a bottom stream, wherein the gas stream is a mixture of ethylene monomer and comonomer; and passing the gas stream to the polymerization reactor to provide the necessary comonomer input.Type: GrantFiled: September 8, 2006Date of Patent: July 19, 2011Assignee: ExxonMobil Chemical Patents Inc.Inventors: John Scott Buchanan, Timothy D. Shaffer, James R. Lattner, John F. Walzer
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Patent number: 7943808Abstract: 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: GrantFiled: December 21, 2006Date of Patent: May 17, 2011Assignee: ExxonMobilChemical Patents Inc.Inventors: Frank Hershkowitz, John Scott Buchanan, Harry W. Deckman, Jeffrey W. Frederick
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Patent number: 7910779Abstract: 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: October 14, 2010Date of Patent: March 22, 2011Assignee: ExxonMobil Chemical Patents Inc.Inventors: Tan-Jen Chen, Jane C. Cheng, Terry E. Helton, John Scott Buchanan
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Patent number: 7910778Abstract: 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: GrantFiled: July 11, 2008Date of Patent: March 22, 2011Assignee: ExxonMobil Chemical Patents Inc.Inventors: Tan-Jen Chen, John Scott Buchanan, Jane Chi-ya Cheng, Terry E. Helton