Patents by Inventor Hari Nair

Hari Nair 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).

  • Patent number: 10781149
    Abstract: Disclosed is a transalkylation process for making an aromatic material between a light aromatic material and a heavier aromatic material in the presence of hydrogen and a transalkylation catalyst comprising a hydrogenation component and a transalkylation component. The process comprises conducting the transalkylation reaction under conditions conducive to reducing the amount of cyclic compounds in the transalkylation reaction mixture in the beginning phase of the operation that is different from the conditions after the beginning phase. The invention is useful, e.g., in transalkylation between toluene and C9+ aromatic feed materials to produce xylenes and/or benzene.
    Type: Grant
    Filed: November 16, 2015
    Date of Patent: September 22, 2020
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Michel Molinier, Jeffrey L. Andrews, Hari Nair
  • Patent number: 10647640
    Abstract: Systems and methods are provided for forming para-xylene from aromatics-containing streams having reduced or minimized amounts of C2+ side chains. Reduced or minimized amounts of C2+ side chains can provide benefits for improving and/or allowing modification of transalkylation conditions, xylene isomerization conditions, or a combination thereof. Such aromatics-containing streams can be formed, for example, by conversion of methyl halide, methanol, syngas, and/or dimethyl ether to aromatics by an aromatic conversion process. The methyl halide, methanol, syngas, and/or dimethyl ether can be formed by conversion of methane.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: May 12, 2020
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Michael Salciccioli, Hari Nair, Glenn C. Wood, Nikolaos Soultanidis
  • Publication number: 20200031737
    Abstract: Disclosed are processes for conversion of a feedstock comprising C8+ aromatic hydrocarbons to lighter aromatic products in which the feedstock and optionally hydrogen are contacted in the presence of the catalyst composition under conversion conditions effective to dealkylate and transalkylate said C8+ aromatic hydrocarbons to produce said lighter aromatic products comprising benzene, toluene and xylene. The catalyst composition comprises a zeolite, a first metal, and a second metal, and is treated with a source of sulfur and/or a source of steam.
    Type: Application
    Filed: September 28, 2017
    Publication date: January 30, 2020
    Inventors: Christine N. Elias, Wenyih F. Lai, Hari Nair, Joshua I. Cutler, Chuansheng Bai, Nicholas S. Rollman
  • Publication number: 20200031740
    Abstract: Disclosed are processes for conversion of a feedstock comprising C8+ aromatic hydrocarbons to lighter aromatic products in which the feedstock and optionally hydrogen are contacted in the presence of a first and a second catalyst composition under conversion conditions effective to produce said lighter aromatic products comprising benzene, toluene and xylene. In the process, the C8+ aromatic hydrocarbons are dealkylated to form C6-C7 aromatic hydrocarbon and the C2+ olefins formed are saturated. The remaining C8+ aromatic hydrocarbons are transalkylated with the C6-C7 aromatic hydrocarbon. The first and second catalyst compositions each comprise a zeolite, a first metal, and optionally a second metal, and are treated with a source of sulfur and/or a source of steam.
    Type: Application
    Filed: September 28, 2017
    Publication date: January 30, 2020
    Inventors: Christine N. Elias, Wenyih F. Lai, Hari Nair, Joshua I. Cutler, Chuansheng Bai, Nicholas S. Rollman
  • Patent number: 10265688
    Abstract: A process and catalyst system is disclosed for producing para-xylene from a C8 hydrocarbon mixture comprising ethylbenzene and at least one xylene isomer other than para-xylene. The process modifies the conventional process by operating with a higher weight hourly space velocity, lower pressure and lower hydrogen partial pressure, which allows production of on-specification benzene product without penalty with respect to ethylbenzene conversion, para-xylene approach to equilibrium or xylene losses. The catalyst system comprises a first catalyst bed comprising a first zeolite having a constraint index from 1 to 12 and an average crystal size from 0.1 to 1 micron and a platinum hydrogenation component, and a second catalyst bed comprising a second zeolite having a constraint index ranging from 1 to 12 and an average crystal size of less than 0.1 micron and a rhenium hydrogenation component.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: April 23, 2019
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Michel Molinier, Hari Nair, Xiaobo Zheng
  • Publication number: 20180370874
    Abstract: Systems and methods are provided for forming para-xylene from aromatics-containing streams having reduced or minimized amounts of C2+ side chains. Reduced or minimized amounts of C2+ side chains can provide benefits for improving and/or allowing modification of transalkylation conditions, xylene isomerization conditions, or a combination thereof. Such aromatics-containing streams can be formed, for example, by conversion of methyl halide, methanol, syngas, and/or dimethyl ether to aromatics by an aromatic conversion process. The methyl halide, methanol, syngas, and/or dimethyl ether can be formed by conversion of methane.
    Type: Application
    Filed: December 5, 2016
    Publication date: December 27, 2018
    Inventors: Michael Salciccioli, Hari Nair, Glenn C. Wood, Nikolaos Soultanidis
  • Patent number: 10144006
    Abstract: A catalyst system is disclosed for producing para-xylene from a C8 hydrocarbon mixture comprising ethylbenzene and at least one xylene isomer other than para-xylene. The catalyst system comprises a first catalyst bed and a second catalyst bed. The first catalyst bed comprises a first zeolite and a rhenium hydrogenation component. The first zeolite has a constraint index from 1 to 12, an average crystal size from 0.1 to 1 micron and has been selectivated to have an ortho-xylene sorption time of greater than 1200 minutes based on its capacity to sorb 30% of the equilibrium capacity of ortho-xylene at 120° C. and an ortho-xylene partial pressure of 4.5±0.8 mm of mercury. The second catalyst bed comprises a second zeolite and a rhenium hydrogenation component. The second zeolite has a constraint index ranging from 1 to 12 and an average crystal size of less than 0.1 micron.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: December 4, 2018
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Jane C. Cheng, Xiaobo Zheng, Hari Nair
  • Patent number: 10118165
    Abstract: Disclosed is a catalyst composition and its use in a process for the conversion of a feedstock containing C8+ aromatic hydrocarbons to produce light aromatic products, comprising benzene, toluene and xylene. The catalyst composition comprises a first zeolite having a constraint index of 3 to 12, a second zeolite comprising a mordenite zeolite synthesized from TEA or MTEA, at least one first metal of Group 10 of the IUPAC Periodic Table, and at least one second metal of Group 11 to 15 of the IUPAC Periodic Table, wherein said mordenite zeolite has a mesopore surface area of greater than 30 m2/g and said mordenite zeolite comprises agglomerates composed of primary crystallites, wherein said primary crystallites have an average primary crystal size as measured by TEM of less than 80 nm and an aspect ratio of less than 2.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: November 6, 2018
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Wenyih F. Lai, Christine N. Elia, Jane C. Cheng, Shifang L. Luo, Hari Nair, Joshua I. Cutler, Doron Levin
  • Patent number: 10058853
    Abstract: Disclosed is a catalyst composition and its use in a process for the conversion of a feedstock containing C8+ aromatic hydrocarbons to produce light aromatic products, comprising benzene, toluene and xylene. The catalyst composition comprises a mordenite zeolite synthesized from TEA or MTEA, optionally at least one first metal of Group 10 of the IUPAC Periodic Table, and optionally at least one second metal of Group 11 to 15 of the IUPAC Periodic Table, wherein said mordenite zeolite has a mesopore surface area of greater than 30 m2/g and said mordenite zeolite comprises agglomerates composed of primary crystallites, wherein said primary crystallites have an average primary crystal size as measured by TEM of less than 80 nm and an aspect ratio of less than 2.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: August 28, 2018
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Wenyih F. Lai, Christine N. Elia, Jane C. Cheng, Shifang L. Luo, Hari Nair, Joshua I. Cutler, Doron Levin, Chuansheng Bai
  • Patent number: 10058854
    Abstract: Disclosed are a catalyst system and its use in a process for the conversion of a feedstock containing C8+ aromatic hydrocarbons to produce light aromatic products, comprising benzene, toluene and xylene.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: August 28, 2018
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Christine N. Elia, Shifang L. Luo, Hari Nair, Wenyih F. Lai, Robert G. Tinger
  • Publication number: 20180029025
    Abstract: Disclosed are a catalyst system and its use in a process for the conversion of a feedstock containing C8+ aromatic hydrocarbons to produce light aromatic products, comprising benzene, toluene and xylene.
    Type: Application
    Filed: September 25, 2017
    Publication date: February 1, 2018
    Applicant: ExxonMobil Chemical Patents Inc.
    Inventors: Christine N. Elia, Shifang L. Luo, Hari Nair, Wenyih F. Lai, Robert G. Tinger
  • Publication number: 20180031310
    Abstract: A shelf for supporting items including but not limited to in refrigerated appliances includes in an integrated fashion a supporting surface and around the perimeter of the supporting surface of similar dimensions. A lighting subassembly is mountable to or integrated in the framing. Electrical power can be through touchless or contact electrical communication. In one form the supporting surface is a single substantially clear plate. In another form the supporting surface is a thin glass top layer and a bottom layer overmolded with the framing to the thin glass top layer.
    Type: Application
    Filed: October 11, 2017
    Publication date: February 1, 2018
    Inventors: James W. Kendall, Matthew P. Ebrom, Eric Andrew Hill, Timothy T. Murphy, Hari Nair, Brian N. Radford
  • Patent number: 9802181
    Abstract: Disclosed are a catalyst system and its use in a process for the conversion of a feedstock containing C8+ aromatic hydrocarbons to produce light aromatic products, comprising benzene, toluene and xylene.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: October 31, 2017
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Christine N. Elia, Shifang L. Luo, Hari Nair, Wenyih F. Lai, Robert G. Tinger
  • Patent number: 9656934
    Abstract: In a process for producing phenol, a cleavage feed comprising cyclohexylbenzene hydroperoxide is supplied to a cleavage reaction zone and a cleavage reaction mixture comprising the cleavage feed is contacted in the cleavage reaction zone with a solid acid catalyst under conditions effective to produce a cleavage effluent comprising phenol and cyclohexanone. The cleavage effluent is then divided into at least a cleavage product and a cleavage recycle and the cleavage recycle and a polar solvent is supplied to the cleavage reaction zone to produce the cleavage reaction mixture with the cleavage feed. Preferably, the polar solvent is combined with the cleavage recycle before being charged into the cleavage reaction zone.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: May 23, 2017
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Hari Nair, Christopher L. Becker, Karen S. Nimmo, James R. Lattner, Francisco M. Benitez, Charles Morris Smith
  • Publication number: 20170081259
    Abstract: A process and catalyst system is disclosed for producing para-xylene from a C8 hydrocarbon mixture comprising ethylbenzene and at least one xylene isomer other than para-xylene. The process modifies the conventional process by operating with a higher weight hourly space velocity, lower pressure and lower hydrogen partial pressure, which allows production of on-specification benzene product without penalty with respect to ethylbenzene conversion, para-xylene approach to equilibrium or xylene losses. The catalyst system comprises a first catalyst bed comprising a first zeolite having a constraint index from 1 to 12 and an average crystal size from 0.1 to 1 micron and a platinum hydrogenation component, and a second catalyst bed comprising a second zeolite having a constraint index ranging from 1 to 12 and an average crystal size of less than 0.1 micron and a rhenium hydrogenation component.
    Type: Application
    Filed: July 28, 2016
    Publication date: March 23, 2017
    Inventors: Michel Molinier, Hari Nair, Xiaobo Zheng
  • Patent number: 9475745
    Abstract: In a process for producing phenol and cyclohexanone, a cleavage feed containing greater than 40 wt % and no greater than 95 wt % cyclohexyl-1-phenyl-1-hydroperoxide, and at least 5 wt % and less than 60 wt % cyclohexylbenzene is mixed with at least phenol, cyclohexanone, water, and sulfuric acid to produce a cleavage reaction mixture containing from 15 wt % to 50 wt % phenol, from 15 wt % to 50 wt % cyclohexanone, from 1 wt % to 10 wt % cyclohexyl-1-phenyl-1-hydroperoxide, from 5 wt % to 60 wt % cyclohexylbenzene, from 0.1 wt % to 4 wt % water, and from 10 wppm to 1000 wppm sulfuric acid. The cleavage reaction mixture is then reacted at a temperature from 30° C. and to 70° C., and a pressure of at least 1 atmosphere for a time sufficient to convert at least 50% of said cyclohexyl-1-phenyl-1-hydroperoxide in said cleavage reaction mixture and produce a cleavage effluent containing phenol and cyclohexanone.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: October 25, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Keith H. Kuechler, Charles Morris Smith, Francisco M. Benitez, Kun Wang, Hari Nair, Travis A. Reine, Gabor Kiss, Roberto Garcia, Christopher L. Becker
  • Patent number: 9469580
    Abstract: Disclosed herein is a process for dehydrogenating a hydrocarbon with a dehydrogenation catalyst comprising a step of activating the catalyst precursor in a H2-containing atmosphere. A particularly advantageous activation process includes heating the catalyst precursor to a temperature in a range from 400° C. to 600° C. The process of the present disclosure is particularly advantageous for dehydrogenating cyclohexane to make benzene.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: October 18, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Tan-Jen Chen, Christopher L. Becker, Hari Nair, Francisco M. Benitez, Charles Morris Smith
  • Patent number: 9469589
    Abstract: In a process for producing phenol and/or cyclohexanone, cyclohexylbenzene is contacted with an oxygen-containing gas in the presence of an oxidation catalyst under oxidation conditions effective to produce an oxidation effluent comprising cyclohexylbenzene hydroperoxide. At least a portion of the oxidation effluent is then subjected to a concentrating step to produce a cleavage feed having a higher concentration of cyclohexylbenzene hydroperoxide than the oxidation effluent. A cleavage reaction mixture comprising the cleavage feed is then contacted with a solid acid catalyst in a cleavage reaction zone under conditions effective to produce a cleavage product comprising phenol and cyclohexanone.
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: October 18, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Hari Nair, Christopher L. Becker, Jason D. Davis, Charles Morris Smith
  • Patent number: 9458067
    Abstract: In a process for producing cyclohexylbenzene, hydrogen and benzene are introduced to a first hydroalkylation reaction zone which contains a hydroalkylation catalyst and which is operated under at least partly liquid phase conditions sufficient to effect hydroalkylation of benzene to produce a mixed liquid/vapor phase effluent comprising cyclohexylbenzene and unreacted benzene, wherein at least a portion of the unreacted benzene is in the vapor phase. At least a portion of the effluent is cooled to condense a liquid phase stream containing at least some of the cyclohexylbenzene in the effluent portion and leave a residual stream containing at least some of the unreacted benzene and cyclohexylbenzene. At least a portion of the liquid stream is recycled to the first hydroalkylation reaction zone or to contact the mixed phase effluent exiting the first hydroalkylation reaction zone. Other methods of cooling the reaction effluent are disclosed.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: October 4, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Christopher L. Becker, Hari Nair, James R. Lattner, Keith H. Kuechler
  • Patent number: 9458074
    Abstract: In a process for producing phenol, benzene is reacted with a source of hydrogen containing methane in the presence of a hydroalkylation catalyst under conditions effective to produce a hydroalkylation reaction effluent comprising cyclohexylbenzene, benzene, hydrogen, and methane. A first stream comprising hydrogen, methane, and benzene is removed from the hydroalkylation reaction effluent and the first stream is washed with a second stream containing cyclohexylbenzene to produce a benzene-depleted hydrogen stream containing hydrogen and methane and a wash stream containing cyclohexylbenzene and benzene.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: October 4, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Christopher L. Becker, James R. Lattner, Keith H. Kuechler, Hari Nair