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).

  • Publication number: 20230183063
    Abstract: Disclosed are methods of using a hot oxygen generator to respond to changes in the characteristic of the feed to a partial oxidation reactor.
    Type: Application
    Filed: June 9, 2021
    Publication date: June 15, 2023
    Inventors: Lawrence E. Bool, Bradley D. Damstedt, Shrikar Chakravarti
  • Publication number: 20230070799
    Abstract: A method and system for decarbonization of a hydrocarbon conversion process such as steam methane reforming process for hydrogen production utilizing oxygen transport membrane reactors. The system employs catalyst-containing reforming reactors for converting natural gas into synthesis gas which is further treated in high temperature or medium temperature water gas shift reactors and fed to a hydrogen PSA to produce hydrogen product. The system further employs oxygen transport membrane reactors thermally coupled to reforming reactors and configured to oxy-combust about 90% to about 95% of combustibles in PSA tail gas that may be optionally mixed with natural gas. The oxy-combustion product stream leaving the oxygen transport membrane reactors contains about 90% of the carbon provided to the feed of the reforming reactor. The carbon dioxide in the oxy-combustion product stream can be recovered and further purified for utilization or geologic storage or liquefied to form a liquid carbon dioxide product.
    Type: Application
    Filed: December 18, 2020
    Publication date: March 9, 2023
    Inventors: Sean M. Kelly, Sadashiv M. Swami, Maulik R. Shelat, Ines C. Stuckert, Steven M. Brown, Shrikar Chakravarti, Juan Li, Digna Vora
  • Patent number: 10822234
    Abstract: A system and method for oxygen transport membrane enhanced Integrated Gasifier Combined Cycle (IGCC) is provided. The oxygen transport membrane enhanced IGCC system is configured to generate electric power and optionally produce a fuel/liquid product from coal-derived synthesis gas or a mixture of coal-derived synthesis gas and natural gas derived synthesis gas.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: November 3, 2020
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Sean M. Kelly, Shrikar Chakravarti, Raymond F. Drnevich
  • Publication number: 20200048088
    Abstract: A method and system for producing hydrogen using an oxygen transport membrane based reforming system is disclosed. The system of the invention comprises at least two reactors in the form of sets of catalyst containing tubes: a first set of tubes comprising at least one reforming catalyst containing reforming reactor configured to produce a synthesis gas stream, and a second set of tubes comprising a reactively driven and catalyst containing oxygen transport membrane reactor configured to generate and radiate heat to the reforming reactor. The synthesis gas product is further treated in a separate high temperature water gas shift reactor and optionally in a separate low temperature water gas shift reactor. Hydrogen is produced from the resulting hydrogen-enriched gas using hydrogen PSA. A distinctive feature of this OTM configuration is that no portion of the syngas is fed to the OTM reactor, which allows reforming to be conducted in the reforming reactors at much higher pressures.
    Type: Application
    Filed: March 12, 2018
    Publication date: February 13, 2020
    Inventors: Shrikar Chakravarti, Ines C. Stuckert
  • Publication number: 20190248650
    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: February 19, 2019
    Publication date: August 15, 2019
    Inventors: Shrikar Chakravarti, Raymond Francis Drnevich, Kenneth L. Burgers, Minish M. Shah
  • Patent number: 10005664
    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: November 9, 2015
    Date of Patent: June 26, 2018
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Raymond F. Drnevich, Ines C. Stuckert, Minish M. Shah
  • Patent number: 9938145
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system is disclosed that carries out an air heated pre-reforming process, a primary reforming process, a secondary reforming process.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: April 10, 2018
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Raymond Francis Drnevich, Minish M. Shah, Ines C. Stuckert
  • Patent number: 9839899
    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: February 15, 2016
    Date of Patent: December 12, 2017
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Ines C. Stuckert, Shrikar Chakravarti, Raymond F. Drnevich
  • Patent number: 9637432
    Abstract: A method and system for producing methanol that employs steam methane reforming (SMR) and/or autothermal (ATR) synthesis gas production system, together with a partial oxidation 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 partial oxidation 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: December 9, 2015
    Date of Patent: May 2, 2017
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Minish Shah, Raymond F. Drnevich
  • Patent number: 9624440
    Abstract: In the production of fuel such as ethanol from carbonaceous feed material such as biomass, a stream comprising hydrogen and carbon monoxide is added to the raw gas stream derived from the feed material, and the resulting combined stream is converted into fuel and a gaseous byproduct such as by a Fischer-Tropsch reaction. The gaseous byproduct may be utilized in the formation of the aforementioned stream comprising hydrogen and carbon monoxide.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: April 18, 2017
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Raymond Francis Drnevich, Dante Patrick Bonaquist, Gregory Panuccio
  • Patent number: 9611144
    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: Grant
    Filed: November 26, 2013
    Date of Patent: April 4, 2017
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Raymond Francis Drnevich, Kenneth L. Burgers
  • Publication number: 20170044013
    Abstract: A system and method for oxygen transport membrane enhanced Integrated Gasifier Combined Cycle (IGCC) is provided. The oxygen transport membrane enhanced IGCC system is configured to generate electric power and optionally produce a fuel/liquid product from coal-derived synthesis gas or a mixture of coal-derived synthesis gas and natural gas derived synthesis gas.
    Type: Application
    Filed: April 9, 2015
    Publication date: February 16, 2017
    Inventors: Sean M. Kelly, Shrikar Chakravarti, Raymond F. Drnevich
  • Patent number: 9562472
    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: Grant
    Filed: February 11, 2015
    Date of Patent: February 7, 2017
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Sean M. Kelly, Shrikar Chakravarti, Juan Li
  • Patent number: 9556027
    Abstract: A method and system for producing hydrogen using 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 a reactively driven and catalyst containing oxygen transport membrane reactor with or without an auxiliary source of heat to support primary reforming process within the reforming reactor to first form a synthesis gas product. The auxiliary source of heat is disposed within the oxygen transport membrane based reforming system proximate to the reforming reactors and comprises an auxiliary oxygen transport membrane reactor or a ceramic burner. The synthesis gas product is further treated in a separate high temperature water gas shift reactor and optionally in a separate low temperature water gas shift reactor. Hydrogen is produced from the resulting hydrogen-enriched gas using hydrogen PSA.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: January 31, 2017
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Raymond F. Drnevich, Ines C. Stuckert, Minish M. Shah
  • Publication number: 20160272493
    Abstract: A method and system for producing a synthesis gas in an oxygen transport membrane based reforming system is disclosed that carries out an air heated pre-reforming process, a primary reforming process, a secondary reforming process.
    Type: Application
    Filed: May 27, 2016
    Publication date: September 22, 2016
    Inventors: Shrikar Chakravarti, Raymond Francis Drnevich, Minish M. Shah, Ines C. Stuckert
  • Publication number: 20160176793
    Abstract: A method and system for producing methanol that employs steam methane reforming (SMR) and/or autothermal (ATR) synthesis gas production system, together with a partial oxidation 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 partial oxidation 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: December 9, 2015
    Publication date: June 23, 2016
    Inventors: SHRIKAR CHAKRAVARTI, MINISH SHAH, RAYMOND F. DRNEVICH
  • Patent number: 9365422
    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: Grant
    Filed: December 6, 2013
    Date of Patent: June 14, 2016
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Brian R. Kromer, Keith A. Craigie, Sean M. Kelly, Juan Li
  • Patent number: 9365466
    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: Grant
    Filed: March 4, 2015
    Date of Patent: June 14, 2016
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Shrikar Chakravarti, Kenneth L. Burgers, Raymond F. Drnevich, Ines C. Stuckert
  • Publication number: 20160158723
    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: February 15, 2016
    Publication date: June 9, 2016
    Inventors: Ines C. Stuckert, Shrikar Chakravarti, Raymond F. Drnevich
  • Publication number: 20160152469
    Abstract: A method and system for producing hydrogen using 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 a reactively driven and catalyst containing oxygen transport membrane reactor with or without an auxiliary source of heat to support primary reforming process within the reforming reactor to first form a synthesis gas product. The auxiliary source of heat is disposed within the oxygen transport membrane based reforming system proximate to the reforming reactors and comprises an auxiliary oxygen transport membrane reactor or a ceramic burner. The synthesis gas product is further treated in a separate high temperature water gas shift reactor and optionally in a separate low temperature water gas shift reactor. Hydrogen is produced from the resulting hydrogen-enriched gas using hydrogen PSA.
    Type: Application
    Filed: December 1, 2014
    Publication date: June 2, 2016
    Inventors: Shrikar Chakravarti, Raymond F. Dmevich, Ines C. Stuckert, Minis M. Shah