Patents by Inventor Christophe R. Laroche

Christophe R. Laroche 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: 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: 10449483
    Abstract: A method of treating oil and gas streams comprising H2S and a carbon oxide, the method including the step of treating the oil and gas stream with an amine solution having an alkanolamine and a quaternary ammonium salt, wherein the amine solution selectively removes the H2S over the carbon oxide.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: October 22, 2019
    Assignee: Dow Global Technologies LLC
    Inventor: Christophe R. Laroche
  • Patent number: 10363519
    Abstract: The present invention relates to an aqueous alkanolamine solution and use therein a process for the selective removal of hydrogen sulfide from gaseous mixtures comprising hydrogen sulfide. The aqueous alkanolamine solution consists of —an amino compound with the formula: R1R2NCH2CH(OH)CH2OH wherein R1 and R2 independently represent methyl, ethyl, propyl or isopropyl groups —and bis(2-hydroxyethyl)methylamine, —optionally one or more of a physical solvent, an antifoaming agent, an antioxidant, a corrosion inhibitor, a film former, a chelating agent or a pH adjuster and —water The process for selectively removing hydrogen sulfide, comprising the step of contacting the gaseous mixture with the aqueous alkanolamine solution, preferably wherein the temperature of the aqueous alkanolamine solution is equal to or greater than 140° F.
    Type: Grant
    Filed: May 17, 2016
    Date of Patent: July 30, 2019
    Assignee: Dow Global Technologies LLC
    Inventors: Ross E. Dugas, Christophe R. Laroche, Jonathan W. Leister
  • 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: 20180290101
    Abstract: The present invention relates to an aqueous alkanolamine solution and use therein a process for the selective removal of hydrogen sulfide from gaseous mixtures comprising hydrogen sulfide. The aqueous alkanolamine solution consists of—an amino compound with the formula: R1R2NCH2CH(OH)CH2OH wherein R1 and R2 independently represent methyl, ethyl, propyl or isopropyl groups—and bis(2-hydroxyethyl)methylamine,—optionally one or more of a physical solvent, an antifoaming agent, an antioxidant, a corrosion inhibitor, a film former, a chelating agent or a pH adjuster and—water The process for selectively removing hydrogen sulfide, comprising the step of contacting the gaseous mixture with the aqueous alkanolamine solution, preferably wherein the temperature of the aqueous alkanolamine solution is equal to or greater than 140° F.
    Type: Application
    Filed: May 17, 2016
    Publication date: October 11, 2018
    Inventors: Ross E. Dugas, Christophe R. Laroche, Jonathan W, Leister
  • Publication number: 20180208567
    Abstract: The present invention relates to an improved process for making hydroxyethyl piperazine compounds especially mono-hydroxyethyl piperazine. The improvement comprises reacting piperazine and an alkylene oxide, preferably ethylene oxide in a reactive distillation column.
    Type: Application
    Filed: July 8, 2016
    Publication date: July 26, 2018
    Inventors: John G Pendergast Jr., Ravindra S. Dixit, Stephen W. King, Christophe R. Laroche
  • Patent number: 9937462
    Abstract: The present invention relates to an aqueous alkanolamine solution for the removal of hydrogen sulfide from gaseous mixtures containing hydrogen sulfide. The aqueous alkanolamine solution comprises (i) an amino compound with the formula: R1R2NCH2CH(OH)CH2OH wherein R1 and R2 independently represent lower alkyl groups of 1 to 3 carbon atoms, (ii) piperazine, and (iii) optionally a physical solvent, wherein said solution does not contain a strong acid. Further, the present invention relates to a process for removing hydrogen sulfide from a gaseous mixture containing hydrogen sulfide, and additionally other acid gases, if present, for example carbon dioxide, comprising the step of contacting the gaseous mixture contain hydrogen sulfide with the aqueous alkanolamine solution, preferably wherein the temperature of the aqueous alkanolamine solution is equal to or greater than 140° F. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: April 10, 2018
    Assignee: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, Gerardo Padilla, Timothy D. Halnon
  • 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
  • Patent number: 9732298
    Abstract: A method for treating liquefied hydrocarbons including acid gases to remove said acid gases while minimizing loss of amine species, said method comprising the steps of contacting the liquefied hydrocarbons with an absorbent aqueous solution of a first amine compound, the first amine compound having the structure: wherein R1 is propane-2,3-diol; R2 is hydrogen, methyl ethyl, 2-hydroxyethyl, or propane-2,3-diol; and R3 is hydrogen, methyl, ethyl, 2-hydroxyethyl or propane-2,3-diol.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: August 15, 2017
    Assignee: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, James M. Hill
  • 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
  • Patent number: 9708557
    Abstract: A method for treating liquefied hydrocarbons comprising acid gases to remove said gases while minimizing loss of amine species, the method comprising the step of contacting the liquefied hydrocarbons with an absorbent aqueous solution of a first amine compound, the first amine compound having the structure: wherein R1 and R2 may each individually be hydrogen, methyl, ethyl, n-propyl, i-propyl, n-butyl, s-butyl, 2-hydroxyethyl or propane-2,3-diol.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: July 18, 2017
    Assignee: DOW GLOBAL TECHNOLOGIES LLC
    Inventors: Christophe R. Laroche, James M. Hill
  • Publication number: 20170183587
    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 one or more polyhydric alcohol. Said polyhydric alcohol preferably has a hydroxyl content equal to or greater than 31 percent and equal to or less than 75 percent of the formula weight of the compound. Said polyhydric alcohol dehydration compositions are particularly suitable for dewatering and desalting gas stream comprising water and one or more salt.
    Type: Application
    Filed: June 11, 2015
    Publication date: June 29, 2017
    Applicant: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, Eric J. Klinker
  • Publication number: 20170021305
    Abstract: The present invention relates to an aqueous alkanolamine solution for the removal of hydrogen sulfide from gaseous mixtures containing hydrogen sulfide. The aqueous alkanolamine solution comprises (i) an amino compound with the formula: R1R2NCH2CH(OH)CH2OH wherein R1 and R2 independently represent lower alkyl groups of 1 to 3 carbon atoms, (ii) piperazine, and (iii) optionally a physical solvent, wherein said solution does not contain a strong acid. Further, the present invention relates to a process for removing hydrogen sulfide from a gaseous mixture containing hydrogen sulfide, and additionally other acid gases, if present, for example carbon dioxide, comprising the step of contacting the gaseous mixture contain hydrogen sulfide with the aqueous alkanolamine solution, preferably wherein the temperature of the aqueous alkanolamine solution is equal to or greater than 140° F. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.
    Type: Application
    Filed: September 15, 2016
    Publication date: January 26, 2017
    Inventors: Christophe R. Laroche, Gerardo Padilla, Timothy D. Halnon
  • Patent number: 9518240
    Abstract: A method for treating liquefied hydrocarbons including acid gases to remove said acid gases while minimizing loss of amine species, he method comprising the step of contacting he liquefied hydrocarbons with an absorbent aqeuous solution of a first amine compound, the first amine compound having the structure: wherein R1 is hydrogen or propane-2,3-diol and R2 is propane-2,3-diol, or mixtures thereof.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: December 13, 2016
    Assignee: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, James M. Hill
  • Patent number: 9468882
    Abstract: The present invention relates to an aqueous alkanolamine solution for the removal of hydrogen sulfide from gaseous mixtures. The aqueous alkanolamine solution comprises (i) an amino compound with the formula: R1R2NCH2CH(OH)CH2OH wherein R1 and R2 independently represent lower alkyl groups of 1 to 3 carbon atoms and (ii) an acid or acid-forming material having a pKa equal to or less than 8, optionally (iii) another amino compound, and optionally (iv) a physical solvent. 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 the aqueous alkanolamine solution, preferably wherein the temperature of the aqueous alkanolamine solution is equal to or greater than 140° F. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.
    Type: Grant
    Filed: June 6, 2013
    Date of Patent: October 18, 2016
    Assignee: Dow Global Technologies LLC
    Inventors: Christophe R. Laroche, Gerardo Padilla, Timothy D. Halnon
  • 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