Patents by Inventor Nicholas Siefert

Nicholas Siefert 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).

  • Hydrophobic Alkyl-Ester Physical Solvents for CO2 Removal from H2 Produced from Synthesis Gas
    Publication number: 20230043712
    Abstract: One or more embodiments relate to a method for removing CO2 from a gaseous stream containing CO2 having the steps of contacting the gaseous stream containing CO2 with a solvent at a first temperature and a first pressure to dissolve said CO2 in said solvent, where the solvent is made up of at least one ester, and where said at least one ester has two or more alkyl-ester functional groups on a central hydrocarbon chain.
    Type: Application
    Filed: July 18, 2022
    Publication date: February 9, 2023
    Inventors: Jeffrey T. Culp, Wei Shi, Robert L. Thompson, Surya P. Tiwari, Kevin P. Resnik, Lei Hong, Janice A. Steckel, David Hopkinson, Nicholas Siefert
  • Di-substituted siloxane solvents for gas capture
    Patent number: 10589228
    Abstract: The present disclosure provides a method for the separation of a gas constituent from a gaseous mixture. The disclosure also provides polyethylene glycol disubstituted siloxane based solvents for use in the method. These solvents are of use for pre-combustion CO2 capture and are capable of replacing glycol-based solvents while offering operation at a higher temperature region. These solvents are also of use for generation of hydrogen from reformed natural gas or syngas, adjusting CO/H2 ratio for Coal & Biomass to Liquids, removal of CO2 from syngas for coal & biomass to NH3/Fertilizer, natural gas sweetening, and upgrading of landfill and biogas.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: March 17, 2020
    Assignee: U.S. Department of Energy
    Inventors: David P. Hopkinson, Nicholas Siefert, Robert L. Thompson, Megan Macala, Lei Hong
  • DI-SUBSTITUTED SILOXANE SOLVENTS FOR GAS CAPTURE
    Publication number: 20190358585
    Abstract: The present disclosure provides a method for the separation of a gas constituent from a gaseous mixture. The disclosure also provides polyethylene glycol disubstituted siloxane based solvents for use in the method. These solvents are of use for pre-combustion CO2 capture and are capable of replacing glycol-based solvents while offering operation at a higher temperature region. These solvents are also of use for generation of hydrogen from reformed natural gas or syngas, adjusting CO/H2 ratio for Coal & Biomass to Liquids, removal of CO2 from syngas for coal & biomass to NH3/Fertilizer, natural gas sweetening, and upgrading of landfill and biogas.
    Type: Application
    Filed: May 25, 2018
    Publication date: November 28, 2019
    Applicant: Energy, United States Department of
    Inventors: DAVID P. HOPKINSON, NICHOLAS SIEFERT, ROBERT L. THOMPSON, MEGAN MACALA, LEI HONG
  • Sulfur tolerant hydrophobic ionic liquid solvent
    Patent number: 9975080
    Abstract: Exemplary embodiments relate to methods for removal of CO2 and other acid gases from gaseous fuels prior to combustion. Exemplary methods may be used for CO2 capture, H2 purification and natural gas sweetening. Exemplary methods use at least one ionic liquid that has excellent CO2 solubility, selectivity over hydrogen, low viscosity, and resistance to H2S.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: May 22, 2018
    Assignee: U.S. Department of Energy
    Inventors: David Luebke, Hunaid Nulwala, Brian Kail, Fan Shi, Robert L Thompson, Nicholas Siefert