Patents by Inventor Steven T. Coleman

Steven T. Coleman 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).

  • Method of thawing a cryogenic unit
    Patent number: 7043938
    Abstract: A method for thawing and removing frozen material from a cryogenic separation unit such as that found in an olefin production plant comprising employing a flushing agent to thaw and remove the frozen material, purging the flushing agent with a gas, and removing residual flushing agent with a solvent that is miscible with the flushing agent and has a freezing temperature substantially lower than the flushing agent.
    Type: Grant
    Filed: September 5, 2002
    Date of Patent: May 16, 2006
    Assignee: Equistar Chemicals, LP
    Inventors: Raghu S. Narayan, Steven T. Coleman, James H. Walker
  • 1-butene production
    Patent number: 6884917
    Abstract: A method for forming high purity 1-butene wherein a feed composed of pentenes and hexenes is subjected to metathesis with ethylene to form a mixture containing propylene, 1-butene, 2-butenes, pentenes, and hexenes, and high purity 1-butene is separately recovered from the mixture by simple distillation.
    Type: Grant
    Filed: May 18, 2004
    Date of Patent: April 26, 2005
    Assignee: Equistar Chemicals, LP
    Inventor: Steven T. Coleman
  • Propylene production
    Patent number: 6872862
    Abstract: A method for making propylene from alpha olefins, internal linear olefins and isoolefins wherein the alpha olefins are subjected to a combination of hydrogenation and double bond isomerization to form additional internal linear olefins, the internal linear olefins are separated from the isoolefins and disproportionated with ethylene to form a propylene product, while the thus separated isoolefins are subjected to skeletal isomerization to form yet additional internal linear olefins to be converted into yet additional propylene product.
    Type: Grant
    Filed: June 25, 2003
    Date of Patent: March 29, 2005
    Assignee: Equistar Chemicals, LP
    Inventors: Robert S. Bridges, Donald H. Powers, Steven T. Coleman
  • Propylene production
    Publication number: 20040267067
    Abstract: A method for making propylene from alpha olefins, internal linear olefins and isoolefins wherein the alpha olefins are subjected to a combination of hydrogenation and double bond isomerization to form additional internal linear olefins, the internal linear olefins are separated from the isoolefins and disproportionated with ethylene to form a propylene product, while the thus separated isoolefins are subjected to skeletal isomerization to form yet additional internal linear olefins to be converted into yet additional propylene product.
    Type: Application
    Filed: June 25, 2003
    Publication date: December 30, 2004
    Inventors: Robert S. Bridges, Donald H. Powers, Steven T. Coleman
  • Propylene production
    Publication number: 20040192994
    Abstract: A method for making propylene from alpha olefins, internal linear olefins, and isoolefins wherein the internal linear olefins are separated and then disproportionated with ethylene to form a propylene product, while the alpha olefins are subjected to double bond isomerization to form additional internal linear olefins, and the isoolefins are subjected to skeletal isomerization to form yet additional internal linear olefins.
    Type: Application
    Filed: March 26, 2003
    Publication date: September 30, 2004
    Inventors: Robert S. Bridges, Donald H. Powers, Steven T. Coleman
  • Method of thawing a cryogenic unit
    Publication number: 20040055330
    Abstract: A method for thawing and removing frozen material from a cryogenic separation unit such as that found in an olefin production plant comprising employing a flushing agent to thaw and remove the frozen material, purging the flushing agent with a gas, and removing residual flushing agent with a solvent that is miscible with the flushing agent and has a freezing temperature substantially lower than the flushing agent.
    Type: Application
    Filed: September 5, 2002
    Publication date: March 25, 2004
    Inventors: Raghu S. Narayan, Steven T. Coleman, James H. Walker