Patents by Inventor Shrikar Chakravarti

Shrikar Chakravarti 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: 9352296
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system is disclosed that carries out a primary reforming process, a secondary reforming process.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: May 31, 2016
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Raymond Francis Drnevich, Minish M. Shah, Ines C. Stuckert
  • Publication number: 20160102259
    Abstract: Oxygen is added to a raw syngas stream that contains hydrogen and CO, one or more light hydrocarbons, and that may also contain tars, produced by gasification of carbonaceous feed material, while imparting heat at a rate greater than 125 BTU per pound of oxygen added, to partially oxidize light hydrocarbons and convert tars if present to lower molecular weight products.
    Type: Application
    Filed: December 18, 2015
    Publication date: April 14, 2016
    Inventors: LAWRENCE BOOL, SHRIKAR CHAKRAVARTI, STEFAN E.F. LAUX, RAYMOND F. DRNEVICH, DANTE P. BONAQUIST, DAVID R. THOMPSON
  • Patent number: 9296671
    Abstract: A method and system for producing methanol that employs an integrated oxygen transport membrane based reforming system is disclosed. The integrated oxygen transport membrane based reforming system carries out a primary reforming process, a secondary reforming process, and synthesis gas conditioning to produce synthesis gas having a desired module of between about 2.0 and 2.2 for a methanol production process thereby optimizing the efficiency and productivity of the methanol plant.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: March 29, 2016
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Ines C. Stuckert, Shrikar Chakravarti, Raymond Francis Drnevich
  • Patent number: 9290422
    Abstract: A hybrid plant and method for producing liquid fuel product from hydrogen and carbon monoxide containing streams produced by gasifying solid carbonaceous feedstock and steam reforming of light fossil fuels. When a gasification unit in the hybrid plant is operating at reduced capacity or is not operational, oxygen that would have been used in the gasification unit is diverted to a light fossil fuel conversion unit containing an autothermal reformer to increase H2-rich syngas flow to a liquid fuel production unit and maintain liquid fuel production at near nameplate capacity.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: March 22, 2016
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Raymond F. Drnevich, Shrikar Chakravarti, Minish M. Shah
  • Publication number: 20160060109
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system is disclosed that carries out a primary reforming process within a reforming reactor, and a secondary reforming process within an oxygen transport membrane reactor and in the presence of heat generated from a oxygen transport membrane reactor and an auxiliary source of heat. The auxiliary source of heat is disposed within the reactor housing proximate the reforming reactors and may include an auxiliary reactively driven oxygen transport membrane reactor or a ceramic burner.
    Type: Application
    Filed: November 9, 2015
    Publication date: March 3, 2016
    Inventors: Shrikar Chakravarti, Raymond F. Drnevich, Ines C. Stuckert, Minish M. Shah
  • Patent number: 9212113
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system is disclosed that carries out a primary reforming process within a reforming reactor, and a secondary reforming process within an oxygen transport membrane reactor and in the presence of heat generated from a oxygen transport membrane reactor and an auxiliary source of heat. The auxiliary source of heat is disposed within the reactor housing proximate the reforming reactors and may include an auxiliary reactively driven oxygen transport membrane reactor or a ceramic burner.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: December 15, 2015
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Raymond F. Drnevich, Ines C. Stuckert, Minish M. Shah
  • Patent number: 9145525
    Abstract: A process and method for producing liquid fuel product from hydrogen and carbon monoxide containing streams produced by gasifying solid carbonaceous feedstock and steam reforming of light fossil fuels. The gasifier syngas is treated to preferentially remove at least 99% of sulfur containing impurities and less than 50% of the CO2 to produce a treated gasifier syngas and a CO2 enriched gas. The treated gasifier syngas and the light fossil fuel conversion unit product gas are combined to form a mixed syngas that is converted into a liquid fuel product. The CO2 enriched gas is used in the gasification unit.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: September 29, 2015
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Raymond F. Drnevich, Minish M Shah
  • Publication number: 20150251967
    Abstract: A system and method for producing a liquid hydrocarbon product from a Fischer-Tropsch process using a synthesis gas feed produced in an oxygen transport membrane based reforming reactor. The system and method involve reforming a mixed feed stream comprising natural gas, hydrogen and the Fischer-Tropsch tail gas, in a reforming reactor in the presence of steam, radiant heat from oxygen transport membrane elements and a reforming catalyst to produce a reformed synthesis gas stream comprising hydrogen, carbon monoxide, and unreformed hydrocarbon gas. The reformed synthesis gas stream is further reformed in an oxygen transport membrane based reforming reactor and conditioned to produce a synthesis gas product stream preferably having a H2/CO ratio of from about 1.7 to about 2.2. The synthesis gas product stream is then synthesized using a Fischer Tropsch process to produce the liquid hydrocarbon product and a Fischer-Tropsch tail gas.
    Type: Application
    Filed: March 4, 2015
    Publication date: September 10, 2015
    Inventors: Shrikar Chakravarti, Kenneth L. Burgers, Raymond F. Drnevich, Ines C. Stuckert
  • Patent number: 9115045
    Abstract: A method and system for producing methanol that employs both an oxygen transport membrane (OTM) based reforming system together with a more traditional steam methane reforming (SMR) and/or autothermal (ATR) synthesis gas production system is disclosed. The dual mode system and method for producing the synthesis gas in a methanol production process optimizes the efficiency and productivity of the methanol plant by using the OTM based reforming system as an independent source of synthesis gas. The disclosed methods and systems are configurable either as a retrofit to existing methanol production facilities or as an integrated package into newly constructed methanol production facilities.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: August 25, 2015
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Minish M. Shah, Raymond Francis Drnevich, Wladimir Y. Sarmiento-Darkin, Brian R. Kromer, Sean M. Kelly
  • Publication number: 20150226118
    Abstract: A carbon capture enabled system and method for generating electric power and/or fuel from methane containing sources using oxygen transport membranes by first converting the methane containing feed gas into a high pressure synthesis gas. Then, in one configuration the synthesis gas is combusted in oxy-combustion mode in oxygen transport membranes based boiler reactor operating at a pressure at least twice that of ambient pressure and the heat generated heats steam in thermally coupled steam generation tubes within the boiler reactor; the steam is expanded in steam turbine to generate power; and the carbon dioxide rich effluent leaving the boiler reactor is processed to isolate carbon. In another configuration the synthesis gas is further treated in a gas conditioning system configured for carbon capture in a pre-combustion mode using water gas shift reactors and acid gas removal units to produce hydrogen or hydrogen-rich fuel gas that fuels an integrated gas turbine and steam turbine system to generate power.
    Type: Application
    Filed: February 11, 2015
    Publication date: August 13, 2015
    Inventors: Sean M. Kelly, Shrikar Chakravarti, Juan Li
  • Publication number: 20150190776
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system is disclosed that carries out a primary reforming process, a secondary reforming process.
    Type: Application
    Filed: March 18, 2015
    Publication date: July 9, 2015
    Inventors: Shrikar Chakravarti, Raymond Francis Drnevich, Minish M. Shah, Ines C. Stuckert
  • Patent number: 9023245
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system is disclosed that carries out a primary reforming process, a secondary reforming process.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: May 5, 2015
    Assignee: Praxair Technology, Inc.
    Inventors: Shrikar Chakravarti, Raymond Francis Drnevich, Minish M. Shah, Ines C. Stuckert
  • Publication number: 20150005398
    Abstract: A process and method for producing liquid fuel product from hydrogen and carbon monoxide containing streams produced by gasifying solid carbonaceous feedstock and steam reforming of light fossil fuels. The gasifier syngas is treated to preferentially remove at least 99% of sulfur containing impurities and less than 50% of the CO2 to produce a treated gasifier syngas and a CO2 enriched gas. The treated gasifier syngas and the light fossil fuel conversion unit product gas are combined to form a mixed syngas that is converted into a liquid fuel product. The CO2 enriched gas is used in the gasification unit.
    Type: Application
    Filed: June 26, 2013
    Publication date: January 1, 2015
    Inventors: Shrikar Chakravarti, Raymond F. Drnevich, Minish M. Shah
  • Publication number: 20140323598
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system is disclosed that carries out a primary reforming process within a reforming reactor, and a secondary reforming process within an oxygen transport membrane reactor and in the presence of heat generated from a oxygen transport membrane reactor and an auxiliary source of heat. The auxiliary source of heat is disposed within the reactor housing proximate the reforming reactors and may include an auxiliary reactively driven oxygen transport membrane reactor or a ceramic burner.
    Type: Application
    Filed: April 25, 2014
    Publication date: October 30, 2014
    Inventors: Shrikar Chakravarti, Raymond F. Drnevich, Ines C. Stuckert, Minish M. Shah
  • Publication number: 20140319425
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system that utilizes a combined feed stream having a steam to carbon ratio between about 1.6 and 3.0 and a temperature between about 500° C. and 750° C. The combined feed stream is comprised a pre-reformed hydrocarbon feed, superheated steam, and a reaction product stream created by the reaction of a hydrogen containing stream reacted with the permeated oxygen at the permeate side of the oxygen transport membrane elements.
    Type: Application
    Filed: November 26, 2013
    Publication date: October 30, 2014
    Inventors: Shrikar Chakravarti, Raymond Francis Drnevich, Kenneth L. Burgers, Minish M. Shah
  • Publication number: 20140323597
    Abstract: A method and system for producing methanol that employs an integrated oxygen transport membrane based reforming system is disclosed. The integrated oxygen transport membrane based reforming system carries out a primary reforming process, a secondary reforming process, and synthesis gas conditioning to produce synthesis gas having a desired module of between about 2.0 and 2.2 for a methanol production process thereby optimizing the efficiency and productivity of the methanol plant.
    Type: Application
    Filed: November 13, 2013
    Publication date: October 30, 2014
    Inventors: Ines C. Stuckert, Shrikar Chakravarti, Raymond Francis Drnevich
  • Publication number: 20140319426
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system that utilizes a combined feed stream having a steam to carbon ratio between about 1.6 and 3.0 and a temperature between about 500° C. and 750° C. The combined feed stream is comprised a pre-reformed hydrocarbon feed, superheated steam, and a reaction product stream created by the reaction of a hydrogen containing stream reacted with the permeated oxygen at the permeate side of the oxygen transport membrane elements and wherein the oxygen transport membrane based reforming system and associated synthesis production process equipment are substantially free of carbon formation and metal dusting corrosion.
    Type: Application
    Filed: November 26, 2013
    Publication date: October 30, 2014
    Inventors: Shrikar Chakravarti, Raymond Francis Drnevich, Kenneth L. Burgers
  • Publication number: 20140319427
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system that utilizes a combined feed stream having a steam to carbon ratio between about 1.6 and 3.0 and a temperature between about 500° C. and 750° C. The combined feed stream is comprised a pre-reformed hydrocarbon feed, superheated steam, and a reaction product stream created by the reaction of a hydrogen containing stream reacted with the permeated oxygen at the permeate side of the oxygen transport membrane elements and wherein the hydrogen containing stream is a recycled portion of the synthesis gas.
    Type: Application
    Filed: December 6, 2013
    Publication date: October 30, 2014
    Inventors: Shrikar Chakravarti, Brian R. Kromer, Keith A. Craigie, Sean M. Kelly, Juan Li
  • Publication number: 20140319424
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system is disclosed that carries out a primary reforming process, a secondary reforming process.
    Type: Application
    Filed: November 13, 2013
    Publication date: October 30, 2014
    Inventors: Shrikar Chakravarti, Raymond Francis Dmevich, Minish M. Shah, Ines C. Stuckert
  • Publication number: 20140323599
    Abstract: A method and system for producing methanol that employs both an oxygen transport membrane (OTM) based reforming system together with a more traditional steam methane reforming (SMR) and/or autothermal (ATR) synthesis gas production system is disclosed. The dual mode system and method for producing the synthesis gas in a methanol production process optimizes the efficiency and productivity of the methanol plant by using the OTM based reforming system as an independent source of synthesis gas. The disclosed methods and systems are configurable either as a retrofit to existing methanol production facilities or as an integrated package into newly constructed methanol production facilities.
    Type: Application
    Filed: November 15, 2013
    Publication date: October 30, 2014
    Inventors: Shrikar Chakravarti, Minish M. Shah, Raymond Francis Drnevich, Wladimir Y. Sarmiento-Darkin, Brian R. Kromer, Sean M. Kelly