Patents by Inventor Siji Okeowo

Siji Okeowo 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).

  • Process for upgrading natural gas with improved management of CO
    Patent number: 8192524
    Abstract: Disclosed herein are processes for producing a CO2-depleted product gas stream. The processes involve feeding a natural gas feed stream comprising greater than about 10 vol % CO2 to at least one membrane unit comprising a plurality of polymer membranes to provide a CO2-rich permeate comprising at least 95 vol % CO2 and a CO2-depleted product gas stream. The polymer membranes comprise a crosslinked polyimide polymer having covalent ester crosslinks and have a CO2 permeance of at least 20 GPU and a CO2/CH4 selectivity of greater than 20, at 35 degrees C. and a feed pressure of 100 psia. Also disclosed herein is an apparatus incorporating the crosslinked polyimide polymer for producing a CO2-depleted product gas stream from a natural gas feed stream.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: June 5, 2012
    Assignee: Chevron U.S.A. Inc.
    Inventors: Daniel Chinn, Siji Okeowo, Jeff D. Euhus, Shabbir Husain
  • Process for Upgrading Natural Gas with Improved Management of CO2
    Publication number: 20100186586
    Abstract: Disclosed herein are processes for producing a CO2-depleted product gas stream. The processes involve feeding a natural gas feed stream comprising greater than about 10 vol % CO2 to at least one membrane unit comprising a plurality of polymer membranes to provide a CO2-rich permeate comprising at least 95 vol % CO2 and a CO2-depleted product gas stream. The polymer membranes comprise a crosslinked polyimide polymer having covalent ester crosslinks and have a CO2 permeance of at least 20 GPU and a CO2/CH4 selectivity of greater than 20, at 35 degrees C. and a feed pressure of 100 psia. Also disclosed herein is an apparatus incorporating the crosslinked polyimide polymer for producing a CO2-depleted product gas stream from a natural gas feed stream.
    Type: Application
    Filed: January 29, 2009
    Publication date: July 29, 2010
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Daniel Chinn, Siji Okeowo, Jeff D. Euhus, Shabbir Husain