Patents by Inventor James E. Siebarth

James E. Siebarth 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 and apparatus for regenerating an iron-based Fischer-Tropsch catalyst
    Patent number: 8431081
    Abstract: Solvent extraction is used to remove wax and contaminants from an iron-based Fischer-Tropsch catalyst in a natural circulation continuous-flow system. The wax-free catalyst is then subjected to controlled oxidation to convert the iron to its initial oxidized state, Fe2O3. Reactivation of the oxide catalyst precursor is carried out by addition of synthesis gas.
    Type: Grant
    Filed: May 10, 2011
    Date of Patent: April 30, 2013
    Assignee: Rentech, Inc.
    Inventors: Belma Demirel, Mark S. Bohn, Charles B. Benham, James E. Siebarth, Mark D. Ibsen
  • METHOD AND APPARATUS FOR REGENERATING AN IRON-BASED FISCHER-TROPSCH CATALYST
    Publication number: 20110211996
    Abstract: Solvent extraction is used to remove wax and contaminants from an iron-based Fischer-Tropsch catalyst in a natural circulation continuous-flow system. The wax-free catalyst is then subjected to controlled oxidation to convert the iron to its initial oxidized state, Fe2O3. Reactivation of the oxide catalyst precursor is carried out by addition of synthesis gas.
    Type: Application
    Filed: May 10, 2011
    Publication date: September 1, 2011
    Inventors: Belma Demirel, Mark S. Bohn, Charles B. Benham, James E. Siebarth, Mark D. Ibsen
  • Method and apparatus for regenerating an iron-based fischer-tropsch catalyst
    Patent number: 7964156
    Abstract: Solvent extraction is used to remove wax and contaminants from an iron-based Fischer-Tropsch catalyst in a natural circulation continuous-flow system. The wax-free catalyst is then subjected to controlled oxidation to convert the iron to its initial oxidized state, Fe203. Reactivation of the oxide catalyst precursor is carried out by addition of synthesis gas.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: June 21, 2011
    Assignee: Rentech, Inc.
    Inventors: Belma Demirel, Mark S. Bohn, Charles B. Benham, James E. Siebarth, Mark D. Ibsen
  • Method and apparatus for regenerating an iron-based fischer-tropsch catalyst
    Patent number: 7303731
    Abstract: Solvent extraction is used to remove wax and contaminants from an iron-based Fischer-Tropsch catalyst in a natural circulation continuous-flow system. The wax-free catalyst is then subjected to controlled oxidation to convert the iron to its initial oxidized state, Fe2O3. Reactivation of the oxide catalyst precursor is carried out by addition of synthesis gas.
    Type: Grant
    Filed: December 7, 2004
    Date of Patent: December 4, 2007
    Assignee: Rentech, Inc.
    Inventors: Belma Demirel, Mark S. Bohn, Charles B. Benham, James E. Siebarth, Mark D. Ibsen
  • Method and apparatus for regenerating an iron-based Fischer-Tropsch catalyst
    Patent number: 6838487
    Abstract: Solvent extraction is used to remove wax and contaminants from an iron-based Fischer-Tropsch catalyst in a natural circulation continuous-flow system. The wax-free catalyst is then subjected to controlled oxidation to convert the iron to its initial oxidized state, Fe2O3. Reactivation of the oxide catalyst precursor is carried out by addition of synthesis gas.
    Type: Grant
    Filed: December 4, 2003
    Date of Patent: January 4, 2005
    Assignee: Rentech, Inc.
    Inventors: Belma Demirel, Mark S. Bohn, Charles B. Benham, James E. Siebarth, Mark D. Ibsen
  • Dynamic settler
    Patent number: 6730221
    Abstract: Catalyst particles are separated from the wax in a reactor slurry reactor by feeding a portion of the slurry to a dynamic settler. Heavier catalyst particles settle and are removed as the slurry at the bottom of the settler is recycled back to the reactor. Clarified wax is removed at the top of the settler. A multi-channel baffle prevents turbulence, improving retention of the desired heavier catalyst particles.
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: May 4, 2004
    Assignee: Rentech, Inc.
    Inventors: Mark S. Bohn, James E. Siebarth
  • Method of removing catalyst particles from wax
    Patent number: 6712982
    Abstract: Catalyst particles are separated from the wax in a reactor slurry reactor by feeding a portion of the slurry to a dynamic settler. Heavier catalyst particles settle and are removed as the slurry at the bottom of the settler is recycled back to the reactor. Clarified wax is removed at the top of the settler. A multi-channel baffle prevents turbulence, improving retention of the desired heavier catalyst particles.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: March 30, 2004
    Assignee: Rentech, Inc.
    Inventors: Mark S. Bohn, James E. Siebarth
  • Method of removing catalyst particles from wax
    Publication number: 20030205516
    Abstract: Catalyst particles are separated from the wax in a reactor slurry reactor by feeding a portion of the slurry to a dynamic settler. Heavier catalyst particles settle and are removed as the slurry at the bottom of the settler is recycled back to the reactor. Clarified wax is removed at the top of the settler. A multi-channel baffle prevents turbulence, improving retention of the desired heavier catalyst particles.
    Type: Application
    Filed: April 17, 2003
    Publication date: November 6, 2003
    Inventors: Mark S. Bohn, James E. Siebarth
  • Dynamic settler
    Publication number: 20020179506
    Abstract: Catalyst particles are separated from the wax in a reactor slurry reactor by feeding a portion of the slurry to a dynamic settler. Heavier catalyst particles settle and are removed as the slurry at the bottom of the settler is recycled back to the reactor. Clarified wax is removed at the top of the settler. A multi-channel baffle prevents turbulence, improving retention of the desired heavier catalyst particles.
    Type: Application
    Filed: May 29, 2001
    Publication date: December 5, 2002
    Inventors: Mark S. Bohn, James E. Siebarth