Patents by Inventor Olga C.N. Keeley

Olga C.N. Keeley 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).

  • Dehydrofluorination of pentafluoroalkanes to form tetrafluoroolefins
    Patent number: 9809515
    Abstract: A method for producing a tetrafluoroolefin, such as 2,3,3,3-tetrafluoropropene (HFO-1234yf), comprises dehydrofluorinating a pentafluoroalkane in a gas phase in the presence of a catalyst comprising chromium oxyfluoride. In a preferred embodiment, 2,3,3,3-tetrafluoropropene (HFO-1234yf) is produced by forming a catalyst comprising chromium oxyfluoride by calcining CrF3.xH2O, where x is 1-10, in the presence of a flowing gas comprising nitrogen to form a calcined chromium oxyfluoride, and dehydrofluorinating 1,1,1,2,2-pentafluoropropane (HFC-245cb) in a gas phase in the presence of the catalyst to form the 2,3,3,3-tetrafluoropropene (HFO-1234yf).
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: November 7, 2017
    Assignee: Arkema Inc.
    Inventors: Maher Y. Elsheikh, Philippe Bonnet, Olga C. N. Keeley, Benjamin Bin Chen
  • DEHYDROFLUORINATION OF PENTAFLUOROALKANES TO FORM TETRAFLUOROOLEFINS
    Publication number: 20170022128
    Abstract: A method for producing a tetrafluoroolefin, such as 2,3,3,3-tetrafluoropropene (HFO-1234yf), comprises dehydrofluorinating a pentafluoroalkane in a gas phase in the presence of a catalyst comprising chromium oxyfluoride. In a preferred embodiment, 2,3,3,3-tetrafluoropropene (HFO-1234yf) is produced by forming a catalyst comprising chromium oxyfluoride by calcining CrF3.xH2O, where x is 1-10, in the presence of a flowing gas comprising nitrogen to form a calcined chromium oxyfluoride, and dehydrofluorinating 1,1,1,2,2-pentafluoropropane (HFC-245cb) in a gas phase in the presence of the catalyst to form the 2,3,3,3-tetrafluoropropene (HFO-1234yf).
    Type: Application
    Filed: September 29, 2016
    Publication date: January 26, 2017
    Inventors: Maher Y. Elsheikh, Philippe BONNET, Olga C. N. KEELEY, Benjamin Bin CHEN
  • Dehydrofluorination of pentafluoroalkanes to form tetrafluoroolefins
    Patent number: 9492816
    Abstract: A method for producing a tetrafluoroolefin, such as 2,3,3,3-tetrafluoropropene (HFO-1234yf), comprises dehydrofluorinating a pentafluoroalkane in a gas phase in the presence of a catalyst comprising chromium oxyfluoride. In a preferred embodiment, 2,3,3,3-tetrafluoropropene (HFO-1234yf) is produced by forming a catalyst comprising chromium oxyfluoride by calcining CrF3?xH2O, where x is 1-10, in the presence of a flowing gas comprising nitrogen to form a calcined chromium oxyfluoride, and dehydrofluorinating 1,1,1,2,2-pentafluoropropane (HFC-245cb) in a gas phase in the presence of the catalyst to form the 2,3,3,3-tetrafluoropropene (HFO-1234yf).
    Type: Grant
    Filed: May 3, 2011
    Date of Patent: November 15, 2016
    Assignee: Arkema Inc.
    Inventors: Maher Y. Elsheikh, Philippe Bonnet, Olga C. N. Keeley, Benjamin Bin Chen
  • DEHYDROFLUORINATION OF PENTAFLUOROALKANES TO FORM TETRAFLUOROOLEFINS
    Publication number: 20130060069
    Abstract: A method for producing a tetrafluoroolefin, such as 2,3,3,3-tetrafluoropropene (HFO-123434), comprises dehydrofluorinating a pentafluoroalkane in a gas phase in the presence of a catalyst comprising chromium oxyfluoride. In a preferred embodiment, 2,3,3,3-tetrafluoropropene (HFO-1234yf) is produced by forming a catalyst comprising chromium oxyfluoride by calcining CrF3?xH2O, where x is 1-10, in the presence of a flowing gas comprising nitrogen to form a calcined chromium oxyfluoride, and dehydrofluorinating 1,1,1,2,2-pentafluoropropane (HFC-245cb) in a gas phase in the presence of the catalyst to form the 2,3,3,3-tetrafluoropropene (HFO-1234yf).
    Type: Application
    Filed: May 3, 2011
    Publication date: March 7, 2013
    Applicant: ARKEMA INC.
    Inventors: Maher Y. Elsheikh, Philippe Bonnet, Olga C.N. Keeley, Benjamin Bin Chen