Patents by Inventor Rohit Vijay

Rohit Vijay 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).

  • Publication number: 20240205004
    Abstract: Aspects of the disclosure relate to a system for responding to transient errors temporarily preventing a computing platform hosting data from communicating with an external key manager hosting keys used to encrypt the platform data. The encryption key can be controlled external to the system in an external key manager (EKM). If an error occurs in which the system and the EKM are temporarily not in communication, the external key controlled by the EKM is temporarily not available. The system begins an observation period, during which the observation period the system polls the EKM to check if the external key continues to be unavailable. The system unloads the encrypted data if, after the expiration of the observation period, the EKM is still not available. If the EKM and the external key becomes accessible again during the observation period, the system cancels the observation period and resumes normal operation.
    Type: Application
    Filed: December 13, 2023
    Publication date: June 20, 2024
    Inventors: Rohit Vijay Jog, Cristina Schmidt
  • Patent number: 10159963
    Abstract: Catalyst compositions including a zeolite having a molar ratio of silicon to aluminum of about 10.0 to about 300.0; a Group 10-12 element and combinations thereof; a Group 15 element and combinations thereof; and optionally, a binder, wherein the catalyst composition has a molar ratio of Group 15 element to Group 10-12 element of about 0.01 to about 10.0 are disclosed. Methods of converting organic compounds to aromatics using such catalyst compositions are also disclosed.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: December 25, 2018
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Brett Loveless, Rohit Vijay, Samia Ilias, Stephen J. McCarthy
  • Patent number: 10105690
    Abstract: A catalyst composition includes a zeolite, a binder, and a Group 12 transition metal selected from the group consisting of Zn, Cd, or a combination thereof, the zeolite having a silicon to aluminum ratio of at least about 10, the catalyst composition comprising about 50 wt % or less of the binder based on a total weight of the catalyst composition, the catalyst composition having a micropore surface area of at least about 340 m2/g, a molar ratio of Group 12 transition metal to aluminum of about 0.1 to about 1.3, and at least one of (a) a mesoporosity of greater than about 20 m2/g; (b) a diffusivity for 2,2-dimethylbutane of greater than about 1×10?2 sec?1 when measured at a temperature of about 120° C. and a 2,2-dimethylbutane pressure of about 60 torr (about 8 kPa).
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: October 23, 2018
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Stephen J. McCarthy, Rohit Vijay, Brett Loveless
  • Patent number: 10099209
    Abstract: A catalyst composition comprising a zeolite, an alumina binder, and a Group 12 transition metal selected from Zn and/or Cd, the zeolite having a Si/Al ratio of at least about 10 and a micropore surface area of at least about 340 m2/g, the catalyst composition comprising about 50 wt % or less of the binder, based on a total weight of the catalyst composition, and having a micropore surface area of at least about 290 m2/g, a molar ratio of Group 12 transition metal to aluminum of about 0.1 to about 1.3, and at least one of: a mesoporosity of about 20 m2/g to about 120 m2/g; a diffusivity for 2,2-dimethylbutane of greater than about 1×10?2 sec?1 when measured at a temperature of about 120° C. and a 2,2-dimethylbutane pressure of about 60 torr (8 kPa); and a combined micropore surface area and mesoporosity of at least about 380 m2/g.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: October 16, 2018
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Stephen J. McCarthy, Rohit Vijay, Brett Loveless
  • Patent number: 9964256
    Abstract: In a process for the catalytic conversion of organic oxygenates to hydrocarbons, a feed comprising at least one organic oxygenate is contacted with a zeolite catalyst under conditions effective to produce a hydrocarbon product comprising aromatics, olefins and paraffins. At least a fraction of the hydrocarbon product containing C4+ hydrocarbons, including at least part of the olefins, is then contacted with hydrogen in the presence of a hydrogenation catalyst under conditions effective to saturate at least part of the olefins in the C4+-containing fraction and produce a hydrogenated effluent containing less than 1 wt % olefins. The hydrogenated effluent is useful as a diluent for heavy crude oils.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: May 8, 2018
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Mohsen N. Harandi, Timothy L. Hilbert, Suriyanarayanan Rajagopalan, Stephen J. McCarthy, Rohit Vijay
  • Patent number: 9938205
    Abstract: Apparatuses and processes for converting an oxygenate feedstock, such as methanol and dimethyl ether, in a fluidized bed containing a catalyst to hydrocarbons, such as gasoline boiling components, olefins and aromatics are provided herein.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: April 10, 2018
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Bing Du, Samuel A. Tabak, Mitch L. Hindman, Eric B. Shen, David L. Johnson, Mohsen N. Harandi, Clay R. Sutton, Lu Han, Michael F. Raterman, Zhongcheng Wang, Rohit Vijay, Stephen J. McCarthy
  • Patent number: 9895682
    Abstract: A catalyst composition comprises a self-bound zeolite and a Group 12 transition metal selected from the group consisting of Zn, Cd, or a combination thereof, the zeolite having a silicon to aluminum ratio of at least about 10, the catalyst composition having a micropore surface area of at least about 340 m2/g, a molar ratio of Group 12 transition metal to aluminum of about 0.1 to about 1.3, and at least one of: (a) a mesoporosity of greater than about 20 m2/g; (b) a diffusivity for 2,2-dimethylbutane of greater than about 1×10?2 sec?1 when measured at a temperature of about 120° C. and a 2,2-dimethylbutane pressure of about 60 torr (about 8 kPa).
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: February 20, 2018
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Stephen J. McCarthy, Rohit Vijay, Brett Loveless
  • 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
  • Patent number: 9783460
    Abstract: Embodiments of the invention provide processes for catalytically converting oxygenates to hydrocarbon products having an increased C6-C8 aromatics content therein. Particular processes include (a) providing a first mixture comprising ?10.0 wt. % of at least one oxygenate, based on the weight of the first mixture; (b) contacting the first mixture with a catalyst to convert the first mixture to a product stream including water, one or more hydrocarbons, hydrogen, and one or more oxygenates, wherein the catalyst comprises at least one molecular sieve and at least one element selected from Groups 2-14 of the Periodic Table and the hydrocarbons comprise ?30.0 wt. % of aromatics, based on the weight of the hydrocarbons in the product stream; and (c) separating from the product stream at least one water-rich stream, at least one aromatic-rich hydrocarbon stream, and at least one aromatic-depleted hydrocarbon stream.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: October 10, 2017
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: John D. Ou, Machteld M. Mertens, Linelle T. Jacob, Stephen J. McCarthy, Rohit Vijay, Jeevan S. Abichandani
  • Patent number: 9783463
    Abstract: Methods are provided for forming aromatic compounds from a highly unsaturated aliphatic feeds optionally in combination with methanol. The method can include dehydrogenating a feed containing at least about 50 vol % C1-C4 alkanes under dehydrogenation conditions to form a dehydrogenation effluent containing at least about 25 vol % alkynes. Alternatively, other sources of alkyne-containing feeds can be used. At least a portion of the alkyne-containing feed can then be converted under effective conversion conditions to form a conversion effluent comprising a hydrocarbon product containing aromatic compounds.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: October 10, 2017
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Frank Hershkowitz, Stephen H. Brown, Paul F. Keusenkothen, Tilman W. Beutel, Stephen J. McCarthy, Michel Daage, Rohit Vijay, Samia Ilias
  • Patent number: 9732013
    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: August 18, 2015
    Date of Patent: August 15, 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
  • Patent number: 9598651
    Abstract: An integrated process for producing naphtha fuel, diesel fuel and/or lubricant base oils from feedstocks under sour conditions is provided. The ability to process feedstocks under higher sulfur and/or nitrogen conditions allows for reduced cost processing and increases the flexibility in selecting a suitable feedstock. The sour feed can be delivered to a catalytic dewaxing step without any separation of sulfur and nitrogen contaminants. The integrated process includes an initial dewaxing of a feed under sour conditions, optional hydrocracking of the dewaxed feed, and a separation to form a first diesel product and a bottoms fraction. The bottoms fraction is then exposed to additional hydrocracking and dewaxing to form a second diesel product and optionally a lubricant base oil product. Alternatively, a feedstock can be hydrotreated, fractionated, dewaxed, and then hydrocracked to form a diesel fuel and a dewaxed, hydrocracked bottoms fraction that is optionally suitable for use as a lubricant base oil.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: March 21, 2017
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Krista M. Prentice, Michel Daage, Ajit B. Dandekar, Christopher G. Oliveri, Rohit Vijay, Stephen J. McCarthy, Wenyih F. Lai, Bradley R. Fingland
  • Publication number: 20160178132
    Abstract: In a process for the catalytic conversion of organic oxygenates to hydrocarbons, a feed comprising at least one organic oxygenate is contacted with a zeolite catalyst under conditions effective to produce a hydrocarbon product comprising aromatics, olefins and paraffins. At least a fraction of the hydrocarbon product containing C4+ hydrocarbons, including at least part of the olefins, is then contacted with hydrogen in the presence of a hydrogenation catalyst under conditions effective to saturate at least part of the olefins in the C4+-containing fraction and produce a hydrogenated effluent containing less than 1 wt % olefins. The hydrogenated effluent is useful as a diluent for heavy crude oils.
    Type: Application
    Filed: December 8, 2015
    Publication date: June 23, 2016
    Applicant: ExxonMobil Research and Engineering Company
    Inventors: Mohsen N. Harandi, Timothy L. Hilbert, Suriyanarayanan Rajagopalan, Stephen J. McCarthy, Rohit Vijay
  • Publication number: 20160176776
    Abstract: Described herein are processes for production of hydrocarbon products comprising contacting a feed comprising methanol and/or dimethyl ether with a catalyst composition, which comprises a zeolite having a constraint index from 1-12 and an active binder comprising a metal oxide with a dehydrogenation function, under conditions sufficient to form the hydrocarbon product, wherein the hydrocarbon product comprises aromatics, olefins, and/or paraffins. Also described herein are catalyst compositions comprising a zeolite having a 10-/12-membered ring framework and a microporous surface area of at least 150 m2/g, and from ˜1 wt % to ˜10 wt % of a zinc oxide binder, the catalyst composition having a zinc to aluminum atomic ratio from ˜0.08 to ˜8.5.
    Type: Application
    Filed: December 2, 2015
    Publication date: June 23, 2016
    Applicant: ExxonMobil Research and Engineering Company
    Inventors: Samia Ilias, Brett Loveless, Stephen J. McCarthy, Rohit Vijay
  • Publication number: 20160102031
    Abstract: Apparatuses and processes for converting an oxygenate feedstock, such as methanol and dimethyl ether, in a fluidized bed containing a catalyst to hydrocarbons, such as gasoline boiling components, olefins and aromatics are provided herein.
    Type: Application
    Filed: October 1, 2015
    Publication date: April 14, 2016
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Bing Du, Samuel A. Tabak, Mitch L. Hindman, Eric B. Shen, David L. Johnson, Mohsen N. Harandi, Clay R. Sutton, Lu Han, Michael F. Raterman, Zhongcheng Wang, Rohit Vijay, Stephen J. McCarthy
  • Patent number: 9309472
    Abstract: Methods are provided for improving the yield of distillate products from hydroprocessing of gas oil feedstocks, such as vacuum gas oils. It has been unexpectedly found that stripping of gases or fractionation to separate out a distillate fraction during initial hydrotreatment of a feed can provide a substantial increase in distillate yield at a desired amount of feedstock conversion. The improvement in yield of distillate products can allow a desired level of conversion to be performed on a feedstock for generating lubricating base oil products while reducing or minimizing the amount of naphtha (or lower) boiling range products. Alternatively, the improvement in yield of distillate products can correspond to an improved yield during a single pass through a reaction system, so that distillate yield is increased even though a lubricant boiling range product is not generated.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: April 12, 2016
    Assignee: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Rohit Vijay, Ajit Bhaskar Dandekar, Michel Daage, Christopher G. Oliveri, Christine Nicole Elia, Darryl Donald Lacy, Scott J. Weigel, Bradley R. Fingland
  • Patent number: 9303218
    Abstract: Processes are provided for using employing lower activity hydrodesulfurization catalysts while achieving a desired product sulfur content. After determining effective reaction conditions for hydrodesulfurization using a reference catalyst system, an upstream portion of the catalyst system can be replaced with a lower activity upstream portion. The process allows tailored product sulfur levels to be achieved using reaction conditions similar to those for the reference catalyst system.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: April 5, 2016
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Edward S. Ellis, Rohit Vijay, Matthew Bennett
  • Publication number: 20160090334
    Abstract: Methods are provided for forming aromatic compounds from a highly unsaturated aliphatic feeds optionally in combination with methanol. The method can include dehydrogenating a feed containing at least about 50 vol % C1-C4 alkanes under dehydrogenation conditions to form a dehydrogenation effluent containing at least about 25 vol % alkynes. Alternatively, other sources of alkyne-containing feeds can be used. At least a portion of the alkyne-containing feed can then be converted under effective conversion conditions to form a conversion effluent comprising a hydrocarbon product containing aromatic compounds.
    Type: Application
    Filed: August 18, 2015
    Publication date: March 31, 2016
    Inventors: Frank Hershkowitz, Stephen H. Brown, Paul F. Keusenkothen, Tilman W. Beutel, Stephen J. McCarthy, Michel Daage, Rohit Vijay, Samia IIias
  • Publication number: 20160090332
    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: August 18, 2015
    Publication date: March 31, 2016
    Inventors: John S. Buchanan, Stephen H. Brown, Lorenzo C. DeCaul, Brett T. Loveless, Rohit Vijay, Stephen J. McCarthy, Michel Daage, Mayank Shekhar