Patents by Inventor Raghubir P. Gupta

Raghubir P. Gupta 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: 20190352177
    Abstract: Acid gas compounds are removed from a process gas such as, for example, syngas or natural gas, by flowing a feed gas into a desulfurization unit to remove a substantial fraction of sulfur compounds from the feed gas and flowing the resulting desulfurized gas into a CO2 removal unit to remove a substantial fraction of CO2 from the desulfurized gas.
    Type: Application
    Filed: July 29, 2019
    Publication date: November 21, 2019
    Inventors: David L. Denton, Raghubir P. Gupta, Brian S. Turk, Vijay Gupta, Himanshu Paliwal
  • Patent number: 10414649
    Abstract: Acid gas compounds are removed from a process gas such as, for example, syngas or natural gas, by flowing a feed gas into a desulfurization unit to remove a substantial fraction of sulfur compounds from the feed gas and flowing the resulting desulfurized gas into a CO2 removal unit to remove a substantial fraction of CO2 from the desulfurized gas.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: September 17, 2019
    Assignee: Research Triangle Institute
    Inventors: David L. Denton, Raghubir P. Gupta, Brian S. Turk, Vijay Gupta, Himanshu Paliwal
  • Publication number: 20180339902
    Abstract: A water gas shift reaction is carried out on a feed gas comprising carbon monoxide to produce carbon dioxide and hydrogen gas. The feed gas is split into multiple input streams flowed into respective reactors coupled in series. Steam is supplied to the input stream fed to the first reactor. The shift reaction is carried out in each reactor, with an overall reduced consumption of steam relative to the amount of gas shifted. The water gas shift reaction may be performed in conjunction with removing acid gas compounds from a process gas such as, for example, syngas or natural gas, by flowing a feed gas into a desulfurization unit to remove a substantial fraction of sulfur compounds from the feed gas and flowing the resulting desulfurized gas into a CO2 removal unit to remove a substantial fraction of CO2 from the desulfurized gas.
    Type: Application
    Filed: June 8, 2018
    Publication date: November 29, 2018
    Inventors: Brian S. Turk, Vijay Gupta, David L. Denton, Raghubir P. Gupta, Himanshu Paliwal
  • Publication number: 20180195006
    Abstract: Described herein are processes for converting a biomass starting material (such as lignocellulosic materials) into a low oxygen containing, stable liquid intermediate that can be refined to make liquid hydrocarbon fuels. More specifically, the process can be a catalytic biomass pyrolysis process wherein an oxygen removing catalyst is employed in the reactor while the biomass is subjected to pyrolysis conditions. The stream exiting the pyrolysis reactor comprises bio-oil having a low oxygen content, and such stream may be subjected to further steps, such as separation and/or condensation to isolate the bio-oil.
    Type: Application
    Filed: March 8, 2018
    Publication date: July 12, 2018
    Inventors: David C. Dayton, Raghubir P. Gupta, Brian S. Turk, Atish Kataria, Jian-Ping Shen
  • Patent number: 9944857
    Abstract: Described herein are processes for converting a biomass starting material (such as lignocellulosic materials) into a low oxygen containing, stable liquid intermediate that can be refined to make liquid hydrocarbon fuels. More specifically, the process can be a catalytic biomass pyrolysis process wherein an oxygen removing catalyst is employed in the reactor while the biomass is subjected to pyrolysis conditions. The stream exiting the pyrolysis reactor comprises bio-oil having a low oxygen content, and such stream may be subjected to further steps, such as separation and/or condensation to isolate the bio-oil.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: April 17, 2018
    Assignee: Research Triangle Institute
    Inventors: David C. Dayton, Raghubir P. Gupta, Brian S. Turk, Atish Kataria, Jian-Ping Shen
  • Publication number: 20170334718
    Abstract: Acid gas compounds are removed from a process gas such as, for example, syngas or natural gas, by flowing a feed gas into a desulfurization unit to remove a substantial fraction of sulfur compounds from the feed gas and flowing the resulting desulfurized gas into a CO2 removal unit to remove a substantial fraction of CO2 from the desulfurized gas.
    Type: Application
    Filed: October 20, 2015
    Publication date: November 23, 2017
    Inventors: David L. DENTON, Raghubir P. GUPTA, Brian S. TURK, Vijay GUPTA, Himanshu PALIWAL
  • Publication number: 20160311682
    Abstract: A water gas shift reaction is carried out on a feed gas comprising carbon monoxide to produce carbon dioxide and hydrogen gas. The feed gas is split into multiple input streams flowed into respective reactors coupled in series. Steam is supplied to the input stream fed to the first reactor. The shift reaction is carried out in each reactor, with an overall reduced consumption of steam relative to the amount of gas shifted. The water gas shift reaction may be performed in conjunction with removing acid gas compounds from a process gas such as, for example, syngas or natural gas, by flowing a feed gas into a desulfurization unit to remove a substantial fraction of sulfur compounds from the feed gas and flowing the resulting desulfurized gas into a CO2 removal unit to remove a substantial fraction of CO2 from the desulfurized gas.
    Type: Application
    Filed: April 22, 2016
    Publication date: October 27, 2016
    Inventors: Brian S. Turk, Vijay Gupta, David L. Denton, Raghubir P. Gupta, Himanshu Paliwal
  • Patent number: 8975464
    Abstract: The present invention provides a method of increasing the efficiency of exothermic CO2 capture processes. The method relates to withdrawing heat generated during the exothermic capture of CO2 with various sorbents via heat exchange with a working fluid. The working fluid is provided at a temperature and pressure such that it is in the liquid state, and has a vaporization temperature in a range such that the heat arising from the reaction of the CO2 and the sorbent causes a phase change from liquid to vapor state in whole or in part and transfers heat from to the working fluid. The resulting heated working fluid may subsequently be used to generate power.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: March 10, 2015
    Assignee: Research Triangle Institute
    Inventors: Aqil Jamal, Raghubir P. Gupta
  • Publication number: 20150051428
    Abstract: Described herein are processes for converting a biomass starting material (such as lignocellulosic materials) into a low oxygen containing, stable liquid intermediate that can be refined to make liquid hydrocarbon fuels. More specifically, the process can be a catalytic biomass pyrolysis process wherein an oxygen removing catalyst is employed in the reactor while the biomass is subjected to pyrolysis conditions. The stream exiting the pyrolysis reactor comprises bio-oil having a low oxygen content, and such stream may be subjected to further steps, such as separation and/or condensation to isolate the bio-oil.
    Type: Application
    Filed: March 6, 2013
    Publication date: February 19, 2015
    Inventors: David C. Dayton, Raghubir P. Gupta, Brian S. Turk, Atish Kataria, Jian-Ping Shen
  • Publication number: 20140005460
    Abstract: The present invention provides a method of increasing the efficiency of exothermic CO2 capture processes. The method relates to withdrawing heat generated during the exothermic capture of CO2 with various sorbents via heat exchange with a working fluid. The working fluid is provided at a temperature and pressure such that it is in the liquid state, and has a vaporization temperature in a range such that the heat arising from the reaction of the CO2 and the sorbent causes a phase change from liquid to vapor state in whole or in part and transfers heat from to the working fluid. The resulting heated working fluid may subsequently be used to generate power.
    Type: Application
    Filed: December 16, 2011
    Publication date: January 2, 2014
    Applicant: RESEARCH TRIANGEL INSTITUTE
    Inventors: Aqil Jamal, Raghubir P. Gupta
  • Publication number: 20130319231
    Abstract: The invention relates to a system for the removal of acid gases from gas streams. The system comprises an integrated membrane-based and liquid solvent-based system for the capture of acid gases. The invention also relates to methods of acid gas capture from gas streams.
    Type: Application
    Filed: December 7, 2011
    Publication date: December 5, 2013
    Applicant: RESEARCH TRIANGLE INSTITUTE
    Inventors: Aqil Jamal, Raghubir P. Gupta, Lora Toy, Luke Coleman
  • Patent number: 7923410
    Abstract: A sorbent for use in removing sulfur contaminants from hydrocarbon feedstocks is provided, wherein the sorbent contains zinc aluminate in an amount of at least 40 wt % (calculated as ZnAl2O4); free alumina in an amount of from about 5 wt % to about 25 wt % (calculated as Al2O3); and iron oxide in an amount of from about 10 wt % to about 30 wt % (calculated as Fe2O3); wherein each of the free alumina and iron oxide are present in non-crystalline form as determined by X-ray diffraction analysis, and a method for producing the sorbent and method for using the sorbent to reduce sulfur contaminants in hydrocarbon feedstocks.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: April 12, 2011
    Assignee: Research Triangle Institute
    Inventors: Brian S. Turk, Santosh K. Gangwal, Raghubir P. Gupta
  • Patent number: 7291259
    Abstract: Processes are disclosed for removing sulfur, including cyclic and polycyclic organic sulfur components such as thiophenes and benzothiophenes, from a hydrocarbon feedstock including fuels and fuel components. The feedstock is contacted with a regenerable sorbent material capable of selectively adsorbing the sulfur compounds present in the hydrocarbon feedstock in the absence of a hydrodesulfurization catalyst. In one embodiment, the sorbent can be an active metal oxide sulfur sorbent in combination with a refractory inorganic oxide cracking catalyst support. In another embodiment, the sorbent can be a metal-substituted refractory inorganic oxide cracking catalyst wherein the metal is a metal which is capable in its oxide form, of adsorption of reduced sulfur compounds by conversion of the metal oxide to a metal sulfide. The processes are preferably carried out in a transport bed reactor.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: November 6, 2007
    Assignee: Research Triangle Institute
    Inventors: Raghubir P. Gupta, Brian S. Turk
  • Patent number: 7067093
    Abstract: Reduced sulfur gas species (e.g., H2S, COS and CS2) are removed from a gas stream by compositions wherein a zinc titanate ingredient is associated with a metal oxide-aluminate phase material in the same particle species. Nonlimiting examples of metal oxides comprising the compositions include magnesium oxide, zinc oxide, calcium oxide, nickel oxide, etc.
    Type: Grant
    Filed: March 2, 2004
    Date of Patent: June 27, 2006
    Assignees: Research Triangle Institute, Intercat, Inc.
    Inventors: Albert A. Vierheilig, Raghubir P. Gupta, Brian S. Turk
  • Patent number: 6812189
    Abstract: The disclosure is directed to sorbent compositions for removing reduced sulfur species (e.g., H2S, COS and CS2) a feed stream. The sorbent is formed from a multi-phase composition including a zinc titanate phase and a zinc oxide-aluminate phase. The sorbent composition is substantially free of unreacted alumina.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: November 2, 2004
    Assignees: Research Triangle Institute, Intercat, Inc.
    Inventors: Albert A. Vierheilig, Raghubir P. Gupta, Brian S. Turk
  • Publication number: 20040170549
    Abstract: Reduced sulfur gas species (e.g., H2S, COS and CS2) are removed from a gas stream by compositions wherein a zinc titanate ingredient is associated with a metal oxide-aluminate phase material in the same particle species. Nonlimiting examples of metal oxides comprising the compositions include magnesium oxide, zinc oxide, calcium oxide, nickel oxide, etc.
    Type: Application
    Filed: March 2, 2004
    Publication date: September 2, 2004
    Applicants: Research Triangel Institute, INTERCAT, INC.
    Inventors: Albert A. Vierheilig, Raghubir P. Gupta, Brian S. Turk
  • Patent number: 6306793
    Abstract: A process of regenerating a sulfided sorbent is provided. According to the process of the invention, a substantial portion of the energy necessary to initiate the regeneration reaction is provided by the combustion of a particulate metal sulfide additive. In using the particulate metal sulfide additive, the oxygen-containing gas used to regenerate the sulfided sorbent can be fed to the regeneration zone without heating or at a lower temperature than used in conventional processes wherein the regeneration reaction is initiated only by heating the oxygen-containing gas. The particulate metal sulfide additive is preferably an inexpensive mineral ore such as iron pyrite which does not adversely affect the regeneration or corresponding desulfurization reactions. The invention further includes a sorbent composition comprising the particulate metal sulfide additive in admixture with an active metal oxide sorbent capable of removing one or more sulfur compounds from a sulfur-containing gas stream.
    Type: Grant
    Filed: March 31, 1999
    Date of Patent: October 23, 2001
    Assignee: Research Triangle Institute
    Inventors: Brian S. Turk, Raghubir P. Gupta
  • Patent number: 5972835
    Abstract: The invention provides fluidizable, substantially spherical particulate material of improved attrition resistance having an average particle size from about 100 to about 400 microns useful as sorbents, catalysts, catalytic supports, specialty ceramics or the like. The particles are prepared by spray drying a slurry comprising inorganic starting materials and an organic binder. Exemplary inorganic starting materials include mixtures of zinc oxide with titanium dioxide, or with iron oxide, alumina or the like. Exemplary organic binders include polyvinyl alcohol, hydroxypropylemethyl cellulose, polyvinyl acetate and the like. The spray dried particles are heat treated at a first temperature wherein organic binder material is removed to thereby provide a porous structure to the particles, and thereafter the particles are calcined at a higher temperature to cause reaction of the inorganic starting materials and to thereby form the final inorganic particulate material.
    Type: Grant
    Filed: September 12, 1996
    Date of Patent: October 26, 1999
    Assignee: Research Triangle Institute
    Inventor: Raghubir P. Gupta
  • Patent number: 5914288
    Abstract: A process of regenerating a sulfided sorbent is provided. According to the process of the invention, a substantial portion of the energy necessary to initiate the regeneration reaction is provided by the combustion of a particulate metal sulfide additive. In using the particulate metal sulfide additive, the oxygen-containing gas used to regenerate the sulfided sorbent can be fed to the regeneration zone without heating or at a lower temperature than used in conventional processes wherein the regeneration reaction is initiated only by heating the oxygen-containing. The particulate metal sulfide additive is preferably an inexpensive mineral ore such as iron pyrite which does not adversely affect the regeneration or corresponding desulfurization reactions. The invention further includes a sorbent composition comprising the particulate metal sulfide additive in admixture with an active metal oxide sorbent capable of removing one or more sulfur compounds from a sulfur-containing gas stream.
    Type: Grant
    Filed: September 29, 1997
    Date of Patent: June 22, 1999
    Assignee: Research Triangle Institute
    Inventors: Brian S. Turk, Raghubir P. Gupta
  • Patent number: 5714431
    Abstract: The present invention provides a zinc titanate sorbent material useful in desulfurization applications. The zinc titanate material is in the form of generally spherical particles of substantially uniform chemical distribution. The sorbent material is capable of absorbing sulfur compounds from a gaseous feed in an amount of at least about 15 weight percent based on the weight of the sorbent. The sorbent material is prepared by a process including: (a) forming a zinc oxide/titanium dioxide dry blend, (b) preparing a substantially uniform aqueous slurry comprising the zinc oxide/titanium dioxide dry blend, organic binder, and at least about 1 weight percent inorganic binder based on the solids weight of the slurry, (c) spray drying the slurry to produce substantially spherical particles, and (d) calcining the particles at a temperature of between about 750.degree. C. to about 950.degree. C. The dry blend is formed by mixing between about 0.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: February 3, 1998
    Assignee: Research Triangle Institute
    Inventors: Raghubir P. Gupta, Santosh K. Gangwal, Suresh C. Jain