Patents by Inventor Russell Mark Stephens

Russell Mark Stephens 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).

  • Patent number: 6768021
    Abstract: Disclosed herein is an improved process for producing ethyl acetate comprising contacting acetic acid and ethanol in a reaction zone in the presence of an acid catalyst, distilling formed vapors and condensing to form an organic phase rich in ethyl acetate and an aqueous phase rich in water, separating the phases and further distilling each phase to obtain a final purified ethyl acetate product and a water stream low in organic components, the improvement comprising directing the organic phase from the first distillation to the reaction zone. An alternate embodiment involves directing at least a portion of the organic phase from the first distillation to a membrane separation unit which removes water and/or alcohol from the organic phase rich in ethyl acetate.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: July 27, 2004
    Assignee: Celanese International Corporation
    Inventors: Kimberly Ann Horan, Carl David Murphy, Russell Mark Stephens, R. Jay Warner, Kenneth Allen Windhorst
  • Publication number: 20030013908
    Abstract: Disclosed herein is an improved process for producing ethyl acetate comprising contacting acetic acid and ethanol in a reaction zone in the presence of an acid catalyst, distilling formed vapors and condensing to form an organic phase rich in ethyl acetate and an aqueous phase rich in water, separating the phases and further distilling each phase to obtain a final purified ethyl acetate product and a water stream low in organic components, the improvement comprising directing the organic phase from the first distillation to the reaction zone.
    Type: Application
    Filed: December 22, 1999
    Publication date: January 16, 2003
    Inventors: KIMBERLY ANN HORAN, CARL DAVID MURPHY, RUSSELL MARK STEPHENS, R. JAY WARNER, KENNETH ALLEN WINDHORST