Patents by Inventor John R. Dowdle

John R. Dowdle 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: 20240367095
    Abstract: A method for treating an industrial gas stream that includes acid gases includes contacting the industrial gas stream with an aqueous liquid absorption medium in a gas/liquid absorber. The aqueous liquid absorption medium includes at least a tertiary alkanolamine having the General Formula (I) in an amount for 10 wt % to 90 wt % and water in an amount from 10 wt % to 90 wt %, based on a total weight of the aqueous liquid absorption medium.
    Type: Application
    Filed: November 15, 2022
    Publication date: November 7, 2024
    Inventors: John R. Dowdle, Zubin B. Kuvadia, Gagan Srivastava, Christophe R. Laroche, Simone T. Lazar
  • Patent number: 12128353
    Abstract: The present invention relates to a dehydration composition and method of use thereof for drying gas streams, in particular natural gas streams, wherein the dehydration composition comprises a (a) glycol and (b) an additive selected so as to increase the viscosity, surface tension, and/or specific gravity of the dehydration composition. Said dehydration composition and method results in the reduction of solvent loss during the dehydration step in a gas dehydration unit.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: October 29, 2024
    Assignee: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, John R. Dowdle, Eric J. Klinker
  • Publication number: 20240050892
    Abstract: An aqueous absorption medium for removal of acid gases from a gaseous stream includes at least one tertiary alkanolamine and at least one secondary alkanolamine. A total weight of the at least one tertiary alkanolamine and the at least one secondary alkanolamine account for an amine weight of the aqueous absorption medium. The amine weight of the aqueous absorption medium is from 25 wt % to 65 wt %, based on a total weight of the aqueous absorption medium, and the at least one secondary alkanolamine is present in an amount from 11 wt % to 45 wt %, based on the amine weight of the aqueous absorption medium.
    Type: Application
    Filed: December 14, 2021
    Publication date: February 15, 2024
    Inventors: John R. Dowdle, Zubin B. Kuvadia, Amanda M. Goodman, Diego E. Cristancho, Simone T. Lazar
  • Patent number: 11253811
    Abstract: Disclosed is a process for regenerating a hybrid solvent used to remove contaminants from a fluid stream and to provide an improved yield of purified fluid. Said process comprises at least one purification unit (12) and at least one regeneration unit (40) wherein condensed water 62 from the regeneration unit is recycled back into the purification unit and none of the condensed water is reintroduced into the regeneration unit.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: February 22, 2022
    Assignee: Dow Global Technologies LLC
    Inventors: John R. Dowdle, Christophe R. Laroche, Diego Ortiz Vega, Linda L. Pirtle
  • Patent number: 11167241
    Abstract: Disclosed is a process for regenerating a hybrid solvent used to remove contaminants from a fluid stream and to provide an improved yield of purified fluid. Said process comprises a purification unit (12) and at least one regeneration unit (40) wherein make-up water (72) is added to the regenerated lean hybrid solvent (55) prior to reuse in the first purification unit and no water is recycled into the regeneration unit.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: November 9, 2021
    Assignee: Dow Global Technologies LLC
    Inventors: John R. Dowdle, Christophe R. Laroche, Diego Ortiz Vega, Linda L. Pirtle
  • Publication number: 20210138389
    Abstract: Disclosed is a process for regenerating a hybrid solvent used to remove contaminants from a fluid stream and to provide an improved yield of purified fluid. Said process comprises at least one purification unit (12) and at least one regeneration unit (40) wherein condensed water 62 from the regeneration unit is recycled back into the purification unit and none of the condensed water is reintroduced into the regeneration unit.
    Type: Application
    Filed: April 19, 2017
    Publication date: May 13, 2021
    Inventors: John R. Dowdle, Christophe R. Laroche, Diego Ortiz Vega, Linda L. Pirtle
  • Publication number: 20210138388
    Abstract: Disclosed is a process for regenerating a hybrid solvent used to remove contaminants from a fluid stream and to provide an improved yield of purified fluid. Said process comprises a purification unit (12) and at least one regeneration unit (40) wherein make-up water (72) is added to the regenerated lean hybrid solvent (55) prior to reuse in the first purification unit and no water is recycled into the regeneration unit.
    Type: Application
    Filed: April 19, 2017
    Publication date: May 13, 2021
    Inventors: John R. Dowdle, Christophe R. Laroche, Diego Ortiz Vega, Linda L. Pirtle
  • Patent number: 10940432
    Abstract: Disclosed is a process for regenerating a hybrid solvent used to remove contaminants from a fluid stream and to provide an improved yield of purified fluid. Said process comprises at least two purification units and at least one regeneration unit wherein regenerated lean hybrid solvent and condensed water from the regeneration unit is used to reclaim additional purified fluid in the second purification unit.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: March 9, 2021
    Assignee: Dow Global Technologies LLC
    Inventors: John R. Dowdle, Timothy D. Halnon, Christophe R. Laroche, Diego Ortiz Vega, Linda L. Pirtle, Gerardo Padilla
  • Patent number: 10933367
    Abstract: Disclosed is a process for regenerating a hybrid solvent used to remove contaminants from a fluid stream and to provide an improved yield of purified fluid. Said process comprises at least one purification unit (12) and at least one regeneration unit (40) wherein condensed water (72) from the regeneration unit is combined with the regenerated lean hybrid solvent (55) prior to reuse in the purification unit and none of the condensed water is recycled into the regeneration unit.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: March 2, 2021
    Assignee: Dow Global Technologies LLC
    Inventors: John R. Dowdle, Christophe R. Laroche, Diego Ortiz Vega, Linda L. Pirtle
  • Publication number: 20200164306
    Abstract: The present invention relates to a dehydration composition and method of use thereof for drying gas streams, in particular natural gas streams, wherein the dehydration composition comprises a (a) glycol and (b) an additive selected so as to increase the viscosity, surface tension, and/or specific gravity of the dehydration composition. Said dehydration composition and method results in the reduction of solvent loss during the dehydration step in a gas dehydration unit.
    Type: Application
    Filed: July 24, 2018
    Publication date: May 28, 2020
    Inventors: Christophe R. Laroche, John R. Dowdle, Eric J. Klinker
  • Publication number: 20200016528
    Abstract: Disclosed is a process for regenerating a hybrid solvent used to remove contaminants from a fluid stream and to provide an improved yield of purified fluid. Said process comprises at least one purification unit (12) and at least one regeneration unit (40) wherein condensed water (72) from the regeneration unit is combined with the regenerated lean hybrid solvent (55) prior to reuse in the purification unit and none of the condensed water is recycled into the regeneration unit.
    Type: Application
    Filed: April 19, 2017
    Publication date: January 16, 2020
    Applicant: Dow Global Technologies LLC
    Inventors: John R. DOWDLE, Christophe R. LAROCHE, Diego ORTIZ VEGA, Linda L. PIRTLE
  • Patent number: 10293299
    Abstract: A method of treating oil and gas streams to remove total organic sulfur or total acid gas including the step of treating the gas stream with a solution of an amine, physical solvent, and water wherein the amine solution may optionally also contain an activator.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: May 21, 2019
    Assignee: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, Gerardo Padilla, John R. Dowdle
  • Patent number: 10286356
    Abstract: The present invention relates to an aqueous alkanolamine solution demonstrating low volatility comprising 2-di-methylamino-2-hydroxymethyl-1, 3-propanediol useful for removing acid gases from gaseous mixtures. Said aqueous alkanolamine solution may further comprise one or more of an acid or acid-forming compound, another amino compound, an activator, a physical solvent, or one or more other compounds used in gal-liquid treatment practices. Further, the present invention relates to a process for removing acid gases from a gaseous mixture, preferably hydrogen sulfide, comprising the step of contacting the gaseous mixture with said aqueous alkanolamine solution. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: May 14, 2019
    Assignee: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, John R. Dowdle
  • Publication number: 20190111380
    Abstract: Disclosed is a process for regenerating a hybrid solvent used to remove contaminants from a fluid stream and to provide an improved yield of purified fluid. Said process comprises at least two purification units and at least one regeneration unit wherein regenerated lean hybrid solvent and condensed water from the regeneration unit is used to reclaim additional purified fluid in the second purification unit.
    Type: Application
    Filed: April 19, 2017
    Publication date: April 18, 2019
    Inventors: John R Dowdle, Timothy D. Helnon, Christophe R. Laroche, Diego Ortiz Vega, Linda L. Pirtle, Gerardo Padilla
  • Patent number: 10226734
    Abstract: A method of treating oil and gas streams including hydrogen sulfide (H2S) comprising treating the gas stream with an aqueous solution of an amine and a physical solvent which, when mixed in equal mass ratio with the amine or amine mixture, display a dielectric constant of at least about 20, wherein the pKa of the amine is at least about 9.0 and the amine boiling point is at least 200° C.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: March 12, 2019
    Assignee: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, Gerardo Padilla, John R. Dowdle
  • Patent number: 10159930
    Abstract: The present invention relates to an aqueous alkanolamine solution demonstrating low volatility comprising 2-di-methylamino-2-hydroxymethyl-1, 3-propanediol useful for removing acid gases from gaseous mixtures. Said aqueous alkanolamine solution may further comprise one or more of an acid or acid-forming compound, another amino compound, an activator, a physical solvent, or one or more other compounds used in gal-liquid treatment practices. Further, the present invention relates to a process for removing acid gases from a gaseous mixture, preferably hydrogen sulfide, comprising the step of contacting the gaseous mixture with said aqueous alkanolamine solution. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: December 25, 2018
    Assignee: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, John R. Dowdle
  • Publication number: 20170239613
    Abstract: The present invention relates to an aqueous alkanolamine solution demonstrating low volatility comprising 2-di-methylamino-2-hydroxymethyl-1, 3-propanediol useful for removing acid gases from gaseous mixtures. Said aqueous alkanolamine solution may further comprise one or more of an acid or acid-forming compound, another amino compound, an activator, a physical solvent, or one or more other compounds used in gal-liquid treatment practices. Further, the present invention relates to a process for removing acid gases from a gaseous mixture, preferably hydrogen sulfide, comprising the step of contacting the gaseous mixture with said aqueous alkanolamine solution. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.
    Type: Application
    Filed: October 6, 2015
    Publication date: August 24, 2017
    Applicant: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, John R. Dowdle
  • Publication number: 20170225117
    Abstract: The present invention relates to an aqueous alkanolamine solution demonstrating low volatility comprising 2-di-methylamino-2-hydroxymethyl-1, 3-propanediol useful for removing acid gases from gaseous mixtures. Said aqueous alkanolamine solution may further comprise one or more of an acid or acid-forming compound, another amino compound, an activator, a physical solvent, or one or more other compounds used in gal-liquid treatment practices. Further, the present invention relates to a process for removing acid gases from a gaseous mixture, preferably hydrogen sulfide, comprising the step of contacting the gaseous mixture with said aqueous alkanolamine solution. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.
    Type: Application
    Filed: October 6, 2015
    Publication date: August 10, 2017
    Applicant: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, John R. Dowdle
  • Publication number: 20160288046
    Abstract: A method of treating oil and gas streams to remove total organic sulfur or total acid gas including the step of treating the gas stream with a solution of an amine, physical solvent, and water wherein the amine solution may optionally also contain an activator.
    Type: Application
    Filed: October 24, 2014
    Publication date: October 6, 2016
    Inventors: Christophe R. Laroche, Gerardo Padilla, John R. Dowdle
  • Publication number: 20160271558
    Abstract: A method of treating oil and gas streams including hydrogen sulfide (H2S) comprising treating the gas stream with an aqueous solution of an amine and a physical solvent which, when mixed in equal mass ratio with the amine or amine mixture, display a dielectric constant of at least about 20, wherein the pKa of the amine is at least about 9.0 and the amine boiling point is at least 200° C.
    Type: Application
    Filed: October 24, 2014
    Publication date: September 22, 2016
    Inventors: Christophe R. Laroche, Gerardo Padilla, John R. Dowdle