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).
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Patent number: 11724938Abstract: Synthesis gas containing nitrogen as the majority component is processed to increase the hydrogen to carbon dioxide ratio. Nitrogen, carbon dioxide, and other contaminants are subsequently removed by a purification unit to produce a purified hydrogen gas stream. A recycle stream within the purification unit helps achieve a hydrogen purity greater than 99.9 percent, and hydrogen recovery greater than 99 percent.Type: GrantFiled: September 24, 2018Date of Patent: August 15, 2023Assignee: Research Triangle InstituteInventors: Shaojun James Zhou, Raghubir P. Gupta, John Reeves Carpenter, Brian S. Turk
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Publication number: 20200231435Abstract: Synthesis gas containing nitrogen as the majority component is processed to increase the hydrogen to carbon dioxide ratio. Nitrogen, carbon dioxide, and other contaminants are subsequently removed by a purification unit to produce a purified hydrogen gas stream. A recycle stream within the purification unit helps achieve a hydrogen purity greater than 99.9 percent, and hydrogen recovery greater than 99 percent.Type: ApplicationFiled: September 24, 2018Publication date: July 23, 2020Inventors: Shaojun James Zhou, Raghubir P. Gupta, John Reeves Carpenter, Brian S. Turk
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Publication number: 20190352177Abstract: 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: ApplicationFiled: July 29, 2019Publication date: November 21, 2019Inventors: David L. Denton, Raghubir P. Gupta, Brian S. Turk, Vijay Gupta, Himanshu Paliwal
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Patent number: 10414649Abstract: 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: GrantFiled: October 20, 2015Date of Patent: September 17, 2019Assignee: Research Triangle InstituteInventors: David L. Denton, Raghubir P. Gupta, Brian S. Turk, Vijay Gupta, Himanshu Paliwal
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Publication number: 20180339902Abstract: 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: ApplicationFiled: June 8, 2018Publication date: November 29, 2018Inventors: Brian S. Turk, Vijay Gupta, David L. Denton, Raghubir P. Gupta, Himanshu Paliwal
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Publication number: 20180195006Abstract: 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: ApplicationFiled: March 8, 2018Publication date: July 12, 2018Inventors: David C. Dayton, Raghubir P. Gupta, Brian S. Turk, Atish Kataria, Jian-Ping Shen
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Patent number: 9944857Abstract: 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: GrantFiled: March 6, 2013Date of Patent: April 17, 2018Assignee: Research Triangle InstituteInventors: David C. Dayton, Raghubir P. Gupta, Brian S. Turk, Atish Kataria, Jian-Ping Shen
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Publication number: 20170334718Abstract: 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: ApplicationFiled: October 20, 2015Publication date: November 23, 2017Inventors: David L. DENTON, Raghubir P. GUPTA, Brian S. TURK, Vijay GUPTA, Himanshu PALIWAL
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Publication number: 20160311682Abstract: 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: ApplicationFiled: April 22, 2016Publication date: October 27, 2016Inventors: Brian S. Turk, Vijay Gupta, David L. Denton, Raghubir P. Gupta, Himanshu Paliwal
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Patent number: 8975464Abstract: 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: GrantFiled: December 16, 2011Date of Patent: March 10, 2015Assignee: Research Triangle InstituteInventors: Aqil Jamal, Raghubir P. Gupta
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Publication number: 20150051428Abstract: 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: ApplicationFiled: March 6, 2013Publication date: February 19, 2015Inventors: David C. Dayton, Raghubir P. Gupta, Brian S. Turk, Atish Kataria, Jian-Ping Shen
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Publication number: 20140005460Abstract: 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: ApplicationFiled: December 16, 2011Publication date: January 2, 2014Applicant: RESEARCH TRIANGEL INSTITUTEInventors: Aqil Jamal, Raghubir P. Gupta
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Publication number: 20130319231Abstract: 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: ApplicationFiled: December 7, 2011Publication date: December 5, 2013Applicant: RESEARCH TRIANGLE INSTITUTEInventors: Aqil Jamal, Raghubir P. Gupta, Lora Toy, Luke Coleman
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Patent number: 7923410Abstract: 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: GrantFiled: September 27, 2006Date of Patent: April 12, 2011Assignee: Research Triangle InstituteInventors: Brian S. Turk, Santosh K. Gangwal, Raghubir P. Gupta
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Patent number: 7291259Abstract: 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: GrantFiled: September 12, 2001Date of Patent: November 6, 2007Assignee: Research Triangle InstituteInventors: Raghubir P. Gupta, Brian S. Turk
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Patent number: 7067093Abstract: 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: GrantFiled: March 2, 2004Date of Patent: June 27, 2006Assignees: Research Triangle Institute, Intercat, Inc.Inventors: Albert A. Vierheilig, Raghubir P. Gupta, Brian S. Turk
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Patent number: 6812189Abstract: 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: GrantFiled: April 3, 2000Date of Patent: November 2, 2004Assignees: Research Triangle Institute, Intercat, Inc.Inventors: Albert A. Vierheilig, Raghubir P. Gupta, Brian S. Turk
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Publication number: 20040170549Abstract: 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: ApplicationFiled: March 2, 2004Publication date: September 2, 2004Applicants: Research Triangel Institute, INTERCAT, INC.Inventors: Albert A. Vierheilig, Raghubir P. Gupta, Brian S. Turk
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Patent number: 6306793Abstract: 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: GrantFiled: March 31, 1999Date of Patent: October 23, 2001Assignee: Research Triangle InstituteInventors: Brian S. Turk, Raghubir P. Gupta
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Patent number: 5972835Abstract: 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: GrantFiled: September 12, 1996Date of Patent: October 26, 1999Assignee: Research Triangle InstituteInventor: Raghubir P. Gupta