Patents Represented by Attorney Andrew B. Griffis
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Patent number: 8344200Abstract: A process for the purification of aromatic streams is provided that includes a new start up procedure that in embodiments significantly reduces impurities in an aromatics feedstock.Type: GrantFiled: April 8, 2010Date of Patent: January 1, 2013Assignee: ExxonMobil Chemical Patents Inc.Inventor: Stephen H. Brown
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Patent number: 8344197Abstract: In a process for the production of para-xylene, methanol is preheated to a first temperature, an aromatic feedstock comprising toluene and/or benzene is preheated to a second temperature and the preheated methanol and aromatic feedstocks are fed to a reactor at a first methanol to aromatic feedstock molar ratio. The preheated aromatic feedstock is contacted with the preheated methanol under alkylation conditions in the reactor in the presence of a catalyst so that the methanol reacts with the aromatic feedstock to produce an effluent comprising para-xylene. During the reaction, a temperature is measured within the reactor and is compared with a predetermined optimal temperature. The methanol to aromatic feedstock molar ratio is then adjusted in a manner to reduce any difference between the measured and predetermined optimal temperatures in the reactor.Type: GrantFiled: September 30, 2010Date of Patent: January 1, 2013Assignee: ExxonMobil Chemical Patents Inc.Inventors: James R. Lattner, Mark P. Hagemeister, Jon Edmond Randolph Stanat, John Di-Yi Ou, Xiaobo Zheng, Lu Han
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Patent number: 8344174Abstract: The efficiency of catalyzed batch esterification reactions is improved by the use of a particular temperature and pressure profile during the reaction cycle. In particular elevated pressure is maintained to prevent alcohol boil off during initial mixing and reaction of the reactants prior to any catalyst addition, and preferably the pressure is reduced rapidly after the desired reaction temperature has been reached.Type: GrantFiled: March 7, 2008Date of Patent: January 1, 2013Assignee: ExxonMobil Chemical Patents Inc.Inventors: Nicolaas Anthony De Munck, Klaas Bandstra, Raphael Frans Caers, Brady Compton, John Lyford, IV, Aad Gerrit Oskam, Berend Jan Van Der Veen
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Patent number: 8329971Abstract: The invention relates to regeneration of catalysts used in the purification of aromatics streams. It has been surprisingly found that retaining small amount of coke on the catalyst reduces regeneration costs and improves regeneration effectiveness.Type: GrantFiled: April 12, 2010Date of Patent: December 11, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: Stephen H. Brown, Terry E. Helton
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Patent number: 8283510Abstract: A process of producing PX comprising providing a C8+ feedstock, the C8+ feedstock has C8 hydrocarbons and C9+ hydrocarbons, to a crystallization unit under crystallization conditions to produce a PX enriched stream having a PX concentration of at least 99.5 wt % based on the weight of the PX enriched stream, wherein the C8+ feedstock has a PX concentration of at least 70 wt % based on total weight of xylenes in the C8+ feedstock, which the C8+ feedstock having a C9+ hydrocarbons concentration in a range from 1 wppm to 10 wt % based on the total weight of the C8+ feedstock.Type: GrantFiled: June 27, 2011Date of Patent: October 9, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: Timothy F. Kinn, Kevin J. Knob
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Patent number: 8273934Abstract: A process for producing a PX-rich product, the process comprising: (a) providing a PX-depleted stream; (b) isomerizing at least a portion of the PX-depleted stream to produce an isomerized stream having a PX concentration greater than the PX-depleted stream and a benzene concentration of less than 1,000 ppm and a C9+ hydrocarbons concentration of less than 5,000 ppm; and (c) separating the isomerized stream by selective adsorption.Type: GrantFiled: November 4, 2009Date of Patent: September 25, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: John Di-Yi Ou, John R. Porter
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Patent number: 8252967Abstract: The proposed process uses crystallization technology to purify paraxylene simultaneously of large concentrations of C8 aromatics and also small concentrations of oxygenated species.Type: GrantFiled: April 7, 2010Date of Patent: August 28, 2012Assignee: Exxonmobil Chemical Patents Inc.Inventors: Mark Paul Hagemeister, David Lee Johnson, John Joseph Monson
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Patent number: 8247618Abstract: Oxidative recovery methods that use oxygen or air for recovery of homogeneous metal catalysts, such as cobalt catalysts, used in for example hydroformylation processes, can be hazardous. Explosive or flammable gas mixtures may be generated inside the process equipment, which can deflagrate upon any ignition source such as a static electricity discharge. The use of a flammable diluent has been found to be a very effective way of optimizing the recovery method, by bringing the resulting gas mixtures above their upper flammability limit. The offgas produced is then also easier to dispose of as a fuel, as compared to when a non-flammable diluent is used.Type: GrantFiled: March 31, 2008Date of Patent: August 21, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: Kenneth J. Buturla, James T. Ritchie, Ronald D. Garton, Eddy T. A. Van Driessche
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Patent number: 8227654Abstract: In a process for reducing the amount of benzene produced in a startup procedure for purification of an aromatic feedstream, the improvement comprising a start-up procedure including contacting said catalyst with said feedstream at elevated LHSV for a period of time sufficient to reduce benzene and/or toluene levels to a predetermined level, and proceeding under normal operational conditions.Type: GrantFiled: August 30, 2010Date of Patent: July 24, 2012Assignee: Exxonmobil Chemical Patents Inc.Inventors: Timothy F. Kinn, Michael C. Clark
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Patent number: 8216450Abstract: According to the invention, trace olefins and dienes are removed from aromatic plant feedstocks by contacting the catalyst using conditions outside the ordinary range used for this application today.Type: GrantFiled: April 12, 2010Date of Patent: July 10, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventor: Stephen H. Brown
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Patent number: 8201696Abstract: Apparatus and methods for liquid-liquid extraction. The apparatus can include a housing having a first section, second section, and third section. One or more sieve trays can be disposed in the first section, and one or more gratings can be disposed in the second section. A hydrocarbon feed inlet can be disposed adjacent the second section, wherein each grating has a plurality of openings formed therethrough. The openings having at least three sides. The first section can be disposed at a first end of the second section, and the third section can disposed at a second end of the second section.Type: GrantFiled: September 10, 2009Date of Patent: June 19, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventor: John J. Monson
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Patent number: 8183424Abstract: In a process for producing xylene by transalkylation of a C9+ aromatic hydrocarbon feedstock with a C6 and/or C7 aromatic hydrocarbon, the C9+ aromatic hydrocarbon feedstock, at least one C6 and/or C7 aromatic hydrocarbon and hydrogen are contacted with a first catalyst comprising (i) a first molecular sieve having a Constraint Index in the range of about 3 to about 12 and (ii) at least first and second different metals or compounds thereof of Groups 6 to 12 of the Periodic Table of the Elements. Contacting with the first catalyst is conducted under conditions effective to dealkylate aromatic hydrocarbons in the feedstock containing C2+ alkyl groups and to saturate C2+ olefins formed so as to produce a first effluent.Type: GrantFiled: December 20, 2010Date of Patent: May 22, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: Doron Levin, April D. Ross, James H. Beech, Jr.
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Patent number: 8178730Abstract: Mixed butene streams containing butene-1 and isobutylene and optionally butene-2 are hydroformylated under conditions that hydroformylates all the monomers to yield a mixture of valeraldehydes.Type: GrantFiled: September 21, 2011Date of Patent: May 15, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: Raphael F. Caers, Eddy Theophile Van Driessche, Hubertus J. Beckers, Luc Roger Marc Martens, Georges Marie Mathys, John Richard Shutt
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Patent number: 8168845Abstract: The invention relates to an improved absorption-type separation and/or purification processes having dual rotary valves.Type: GrantFiled: October 23, 2009Date of Patent: May 1, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: John R. Porter, Dana L. Pilliod
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Patent number: 8163966Abstract: This disclosure relates to a catalyst system adapted for processing aromatic feedstreams comprising C9+ aromatic feedstock to produce at least one xylene.Type: GrantFiled: October 14, 2010Date of Patent: April 24, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventor: Doron Levin
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Patent number: 8163825Abstract: Triglyceride PVC plasticizers can be produced by recovery of C5 to C10 aldehydes having low average levels of branching from a hydroformylation product, oxidizing the aldehydes with oxygen and/or air to form an acid, recovery of the resulting acid, and esterification with glycerol. Plasticizer compositions including such products or linear triglycerides combined with a secondary plasticizer and articles made therefrom are disclosed.Type: GrantFiled: August 17, 2009Date of Patent: April 24, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: Karla S. Colle, Allen David Godwin, Jon Edmond Stanat
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Patent number: 8163171Abstract: The invention relates to hydrocarbon fluids having high purity with respect to at least one of sulfur species, nitrogen species, oxygenated species, and unsaturated species, particularly hydrocarbon fluids low in aromatics, a method of making said hydrocarbon fluids, a catalyst for use in said method, an apparatus whereby said method may be practiced, and uses of said fluids.Type: GrantFiled: December 19, 2005Date of Patent: April 24, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: Thomas Andrew Gribschaw, Sylvain Hantzer, Stephen John McCarthy, Steven E. Silverberg, Vijay Swarup
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Patent number: 8148593Abstract: This invention relates to a process for converting a hydrocarbon feedstock, comprising the steps of (A) feeding the feedstock to a reactor or adsorption unit; (B) contacting the feedstock in the reactor or adsorption unit with a solid particulate material useful for converting the feedstock under conversion conditions; (C) withdrawing converted feedstock from the reactor; and (D) removing, under the conversion conditions for a fractional time of step (B), at least a portion of the solid particulate material while the feedstock is being fed to the reactor or adsorption unit, wherein the portion is more than 0.1 wt. % of the solid particulate material in the reactor or adsorption unit and wherein the fractional time is less than 95% of the time of step (B).Type: GrantFiled: November 11, 2009Date of Patent: April 3, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: Dana Lynn Pilliod, Katy Conley Randall, Eric Martin Harding
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Patent number: 8143438Abstract: The present invention is directed to a process for hydrogenating one or more organic compounds especially unsaturated organic compounds by bringing the compound into contact with a hydrogen-containing gas in the presence of a catalyst, which comprises one or more catalytically active metals applied to a porous catalyst support. The one or more catalytically active metals having been derived via a decomposed organic complex of the metal on the support, in particular amine complexes of the metal. The decomposed complex may be treated with hydrogen to activate the catalyst before use as a hydrogenation catalyst.Type: GrantFiled: December 14, 2010Date of Patent: March 27, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: Stuart Leon Soled, Andrzej Malek, James Clarke Vartuli, Jennifer Schaefer Feeley, Sabato Miseo, Shifang Luo, Richard Henry Schlosberg, Joseph Ernest Baumgartner, Christine E. Kliewer, Steven T. Ragomo
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Patent number: 8143459Abstract: Oxo-alcohols in the plasticizer range typically contain small amounts of methyl esters having the same alkyl chain as the alcohol itself. These methyl esters are causing product quality problems and environmental problems because of transesterification in the esterification process where the plasticizer ester derivatives are produced. A process using controlled oxonation and hydrogenation conditions is disclosed for the production of alcohols containing low amounts of methyl esters. Plasticizer esters with low amounts of aliphatic di-alkyl esters are also disclosed.Type: GrantFiled: April 26, 2010Date of Patent: March 27, 2012Assignee: ExxonMobil Chemical Patents Inc.Inventors: Eddy Van Driessche, Jean-Jacques G. Muls, Arie Van Vliet, Carl R. Beck, Charles M. Yarbrough