Patents by Inventor Mayank Shekhar

Mayank Shekhar 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: 11203557
    Abstract: The invention relates to catalysts and their use in processes for dehydrocyclization of light paraffinic hydrocarbon feedstock to higher-value hydrocarbon, such as aromatic hydrocarbon, to dehydrocyclization catalysts useful in such processes, and to the methods of making such catalysts. One of more of the dehydrocyclization catalysts comprising a crystalline aluminosilicate zeolite having a constraint index of less than or equal to about 12, at least one Group 3 to Group 13 metal of the IUPAC Periodic Table and phosphorous.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: December 21, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Samia Ilias, Mayank Shekhar, Paul F. Keusenkothen, John S. Buchanan
  • Publication number: 20210122688
    Abstract: Systems and methods are provided for integration of an aromatic formation process for converting non-aromatic hydrocarbon to an aromatic product and subsequent methylating of a portion of the aromatic product to produce a methylated product, with improvements in the aromatic formation process and/or the methylation process based on integrating portions of the secondary processing trains associated with the aromatic formation process and the methylation process. The aromatic formation process and methylation process can be used, for example, for integrated production of specialty aromatics or gasoline blending components.
    Type: Application
    Filed: April 19, 2018
    Publication date: April 29, 2021
    Inventors: Catherine M. Dorsi, Todd E. Detjen, Mayank Shekhar, Anthony Go
  • Patent number: 10843981
    Abstract: 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: Grant
    Filed: March 27, 2017
    Date of Patent: November 24, 2020
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Paul F. Keusenkothen, Samia Ilias, John Scott Buchanan, Mayank Shekhar, Reyyan Koc-Karabocek, Teng Xu
  • Patent number: 10836965
    Abstract: Methods of transforming a hydrocarbon feedstream into an aromatization product in a multi-stage reverse flow reactor (RFR) apparatus are disclosed. The methods include at least two reaction stages in series, at least one being a pyrolysis stage and at least another being a catalytic aromatization stage. Using a highly saturated hydrocarbon feedstream the pyrolysis stage focuses on desaturation, while the catalytic aromatization stage focuses on aromatization. The catalytic aromatization stage contains a aromatization catalyst that can include substantially no magnesium, scandium, yttrium, titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, rhenium, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, copper, silver, gold, gallium, indium, tin, lanthanides, or actinides, or, in some cases, substantially no added active metals at all.
    Type: Grant
    Filed: April 12, 2019
    Date of Patent: November 17, 2020
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Mayank Shekhar, James R. Lattner, Federico Barrai, Brian M. Weiss, Dhaval A. Bhandari, Joshua W. Allen
  • Publication number: 20200238271
    Abstract: Methods are provided for activation of catalysts comprising low amounts of a hydrogenation metal, such as low amounts of a Group 8-10 noble metal. The amount of hydrogenation metal on the catalyst can correspond to 0.5 wt % or less (with respect to the weight of the catalyst), or 0.1 wt % or less, or 0.05 wt % or less. Prior to loading a catalyst into a reactor, the corresponding catalyst precursor can be first activated in a hydrogen-containing atmosphere containing 1.0 vppm of CO or less. The thus first-activated catalyst can be transferred to a reactor with optional exposure to oxygen during the transfer, where it can be further activated using a hydrogen-containing atmosphere containing 3.0 vppm of CO or higher, to yield a twice-activated catalyst with high performance. The catalyst can be advantageously a transalkylation catalyst or an isomerization catalyst useful for converting aromatic hydrocarbons.
    Type: Application
    Filed: January 14, 2020
    Publication date: July 30, 2020
    Inventors: Mayank Shekhar, Paul Podsiadlo, Michel Molinier, Scott J. Weigel, Travis D. Sparks, Jocelyn A. Gilcrest, Joseph E. Gatt
  • Publication number: 20190322949
    Abstract: Methods of transforming a hydrocarbon feedstream into an aromatization product in a multi-stage reverse flow reactor (RFR) apparatus are disclosed. The methods include at least two reaction stages in series, at least one being a pyrolysis stage and at least another being a catalytic aromatization stage. Using a highly saturated hydrocarbon feedstream the pyrolysis stage focuses on desaturation, while the catalytic aromatization stage focuses on aromatization. The catalytic aromatization stage contains a aromatization catalyst that can include substantially no magnesium, scandium, yttrium, titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, rhenium, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, copper, silver, gold, gallium, indium, tin, lanthanides, or actinides, or, in some cases, substantially no added active metals at all.
    Type: Application
    Filed: April 12, 2019
    Publication date: October 24, 2019
    Inventors: Mayank Shekhar, James R. Lattner, Federico Barrai, Brian M. Weiss, Dhaval A. Bhandari, Joshua W. Allen
  • Publication number: 20190127294
    Abstract: The invention relates to catalysts and their use in processes for conversion of hydrocarbon feedstock to a product comprising single-ring aromatic hydrocarbons having six or more carbon atoms, to the methods of making such catalysts, to processes for using such catalysts, and to apparatus and systems for carrying out such processes. One of more of the catalysts comprise a crystalline aluminosilicate having a Constraint Index in the range of 1 to 12, a first metal and/or a second metal, and at least one selectivating agent, such as, for example, an organo-silicate.
    Type: Application
    Filed: December 21, 2018
    Publication date: May 2, 2019
    Inventors: Mayank Shekhar, Paul F. Keusenkothen, Machteld M. Mertens, Anthony Go
  • Patent number: 10202318
    Abstract: The invention relates to catalysts and their use in processes for conversion of hydrocarbon feedstock to a product comprising single-ring aromatic hydrocarbons having six or more carbon atoms, to the methods of making such catalysts, to processes for using such catalysts, and to apparatus and systems for carrying out such processes. One of more of the catalysts comprise a crystalline aluminosilicate having a Constraint Index in the range of 1 to 12, a first metal and/or a second metal, and at least one selectivating agent, such as, for example, an organo-silicate.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: February 12, 2019
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Mayank Shekhar, Paul F. Keusenkothen, Machteld M. W. Mertens, Anthony Go
  • Patent number: 10196325
    Abstract: The present invention relates to a multistage process and catalyst system therefor to convert syngas to aromatics. In a first stage, syngas is converted to a C1-C4 alcohol mixture by contacting syngas with a first catalyst comprising rhodium or copper at moderate temperature. In a second stage, the C1-C4 alcohol mixture is converted into an aromatic product by contact with a second catalyst comprising a molecular sieve and at least one Group 8-14 element, the molecular sieve having a Constraint Index about 1 to 12 and a silica to alumina ratio of about 10 to 100 at effective conversion conditions. The final aromatic product is rich in benzene, toluene, and xylenes (e.g. greater than 50% aromatics on a hydrocarbon basis).
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: February 5, 2019
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Nikolaos Soultanidis, Mayank Shekhar, John S. Coleman
  • Publication number: 20190002367
    Abstract: A process for producing naphthalene or methylnaphthalenes from an alkane-containing stream. In an embodiment, the produce includes providing an alkane-containing feed stream to a reactor, and contacting the ethane-containing stream with an aromatization catalyst within the reactor. The aromatization catalyst comprises molecular sieve, and a dehydrogenation component. In addition, the process includes producing a reactor effluent stream from the reactor, and separating a product stream from the reactor effluent stream. The product stream comprises at least one or both of naphthalene and methylnaphthalene.
    Type: Application
    Filed: May 8, 2018
    Publication date: January 3, 2019
    Inventors: Michael Salciccioli, Alan A. Galuska, Tan-Jen Chen, Catherine M. Dorsi, Mayank Shekhar
  • Patent number: 10071938
    Abstract: The invention relates to the production of aromatic hydrocarbon by the conversion of a feed comprising C2+ non-aromatic hydrocarbon, e.g., natural gas. The invention is particularly useful in converting natural gas to liquid-phase aromatic hydrocarbon, which can be more easily transported away from remote natural gas production facilities. The conversion is carried out in the presence of a dehydrocyclization catalyst comprising dehydrogenation and molecular sieve components. The dehydrocyclization catalyst has an average residence time of 90 seconds or less.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: September 11, 2018
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Mayank Shekhar, Paul F. Keusenkothen
  • Patent number: 10059638
    Abstract: Processes are provided for conversion of oxygenated hydrocarbon, such as methanol and/or dimethyl ether, to aromatics, such as a para-xylene, and olefins, such as ethylene and propylene. The processes entail using a reactor having multiple reaction zones where each zone is prepared to promote desired reactions.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: August 28, 2018
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Nikolaos Soultanidis, Jeevan S. Abichandani, Mayank Shekhar
  • Publication number: 20180208523
    Abstract: A catalyst system and processes for combined aromatization and selective hydrogen combustion of oxygenated hydrocarbons are disclosed. The catalyst system contains at least one aromatization component and at least one selective hydrogen combustion component. The process is such that the yield of hydrogen is less than the yield of hydrogen when contacting the hydrocarbons with the aromatization component alone.
    Type: Application
    Filed: March 22, 2018
    Publication date: July 26, 2018
    Applicant: ExxonMobil Chemical Patents Inc.
    Inventors: Paul F. Keusenkothen, Seth M. Washburn, Neeraj Sangar, Nikolaos Soultanidis, Mayank Shekhar
  • Patent number: 9988325
    Abstract: The invention relates to the hydrocarbon upgrading to produce aromatic hydrocarbon, to equipment and materials useful in such upgrading, and to the use of such upgrading for, e.g., producing aromatic hydrocarbon natural gas. The upgrading can be carried out in the presence of a dehydrocyclization catalyst comprising at least one dehydrogenation component and at least one molecular sieve.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: June 5, 2018
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Paul F. Keusenkothen, John S. Buchanan, Samia Ilias, Mayank Shekhar
  • Patent number: 9957203
    Abstract: A catalyst system and processes for combined aromatization and selective hydrogen combustion of oxygenated hydrocarbons are disclosed. The catalyst system contains at least one aromatization component and at least one selective hydrogen combustion component. The process is such that the yield of hydrogen is less than the yield of hydrogen when contacting the hydrocarbons with the aromatization component alone.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: May 1, 2018
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Paul F. Keusenkothen, Seth M. Washburn, Neeraj Sangar, Nikolaos Soultanidis, Mayank Shekhar
  • Publication number: 20180044260
    Abstract: Processes are provided for conversion of oxygenated hydrocarbon, such as methanol and/or dimethyl ether, to aromatics, such as a para-xylene, and olefins, such as ethylene and propylene. The processes entail using a reactor having multiple reaction zones where each zone is prepared to promote desired reactions.
    Type: Application
    Filed: December 7, 2015
    Publication date: February 15, 2018
    Inventors: Nikolaos Soultanidis, Jeevan s. Abichandani, Mayank Shekhar
  • Patent number: 9845272
    Abstract: The invention relates to the conversion of light hydrocarbon to higher-value hydrocarbon, such as aromatic hydrocarbon, to equipment and materials useful in such conversion, and to the use of such conversion for, e.g., natural gas upgrading. The conversion can be carried out in two stages, with each stage containing a dehydrocyclization catalyst comprising at least one dehydrogenation component and at least one molecular sieve.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: December 19, 2017
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: John S. Buchanan, Samia Ilias, Mayank Shekhar, Paul F. Keusenkothen
  • Patent number: 9815749
    Abstract: The invention relates to the production of aromatic hydrocarbon by the conversion of a feed comprising saturated hydrocarbon. At least a portion of the saturated hydrocarbon is converted to olefinic hydrocarbon. Aromatic hydrocarbon is produced from at least a portion of the olefinic hydrocarbon using at least one dehydrocyclization catalyst comprising dehydrogenation and molecular sieve components.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: November 14, 2017
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Paul F. Keusenkothen, Mohsen N. Harandi, John S. Buchanan, Mayank Shekhar
  • Patent number: 9809505
    Abstract: Methods are provided for improving the yield of aromatics during conversion of oxygenate feeds. An oxygenate feed can contain a mixture of oxygenate compounds, including one or more compounds with a hydrogen index of less than 2, so that an effective hydrogen index of the mixture of oxygenates is between about 1.4 and 1.9. Methods are also provided for converting a mixture of oxygenates with an effective hydrogen index greater than about 1 with a pyrolysis oil co-feed. The difficulties in co-processing a pyrolysis oil can be reduced or minimized by staging the introduction of pyrolysis oil into a reaction system. This can allow varying mixtures of pyrolysis oil and methanol, or another oxygenate feed, to be introduced into a reaction system at various feed entry points.
    Type: Grant
    Filed: July 11, 2017
    Date of Patent: November 7, 2017
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: John S. Buchanan, Stephen H. Brown, Lorenzo C. DeCaul, Brett T. Loveless, Rohit Vijay, Stephen J. McCarthy, Michel Daage, Mayank Shekhar
  • Publication number: 20170305810
    Abstract: Methods are provided for improving the yield of aromatics during conversion of oxygenate feeds. An oxygenate feed can contain a mixture of oxygenate compounds, including one or more compounds with a hydrogen index of less than 2, so that an effective hydrogen index of the mixture of oxygenates is between about 1.4 and 1.9. Methods are also provided for converting a mixture of oxygenates with an effective hydrogen index greater than about 1 with a pyrolysis oil co-feed. The difficulties in co-processing a pyrolysis oil can be reduced or minimized by staging the introduction of pyrolysis oil into a reaction system. This can allow varying mixtures of pyrolysis oil and methanol, or another oxygenate feed, to be introduced into a reaction system at various feed entry points.
    Type: Application
    Filed: July 11, 2017
    Publication date: October 26, 2017
    Applicant: ExxonMobil Chemical Patents Inc.
    Inventors: John S. Buchanan, Stephen H. Brown, Lorenzo C. DeCaul, Brett T. Loveless, Rohit Vijay, Stephen J. McCarthy, Michel Daage, Mayank Shekhar