Patents by Inventor Nathan K. Powell

Nathan K. Powell 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).

  • Purification of acetic acid from wood acetylation process
    Patent number: 7612232
    Abstract: A method of purifying acetic acid containing terpene and terpenoid impurities, includes: (a) supplying acetic acid containing terpene or terpenoid impurities and water to a distillation column; (b) azeotropically removing terpene or terpenoid impurities from the mixture of acetic acid and water supplied to the column as distillate; and (c) withdrawing a product stream from the column comprising acetic acid purified of terpene or terpenoid impurities. The method is particularly effective for purifying acetic acid recovered from a wood purification process.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: November 3, 2009
    Assignee: Celanese International Corporation
    Inventors: R. Jay Warner, Melchior A. Meilchen, Michael O. Streb, Nathan K. Powell, Rolf Soellner
  • PURIFICATION OF ACETIC ACID FROM WOOD ACETYLATION PROCESS
    Publication number: 20090247788
    Abstract: A method of purifying acetic acid containing terpene and terpenoid impurities, includes: (a) supplying acetic acid containing terpene or terpenoid impurities and water to a distillation column; (b) azeotropically removing terpene or terpenoid impurities from the mixture of acetic acid and water supplied to the column as distillate; and (c) withdrawing a product stream from the column comprising acetic acid purified of terpene or terpenoid impurities. The method is particularly effective for purifying acetic acid recovered from a wood purification process.
    Type: Application
    Filed: March 27, 2008
    Publication date: October 1, 2009
    Inventors: R. Jay Warner, Melchior A. Meilchen, Michael O. Streb, Nathan K. Powell, Rolf Soellner
  • Acrylic acid recovery utilizing ethyl acrylate and selected co-solvents
    Publication number: 20030150705
    Abstract: A method of recovering acrylic acid from a mixture comprising acrylic acid, water and acetic acid is disclosed, which includes:
    Type: Application
    Filed: December 30, 2002
    Publication date: August 14, 2003
    Inventors: Sanjeev D. Deshpande, Tao Wang, Olan Stanley Fruchey, Roger L. Roundy, Nathan K. Powell, Rafael G. Morales, Joseph E. Goins
  • Acrylic acid recovery utilizing ethyl acrylate and selected co-solvents
    Publication number: 20030146081
    Abstract: A method of recovering acrylic acid from a mixture comprising acrylic acid, water and acetic acid is disclosed, which includes: (a) extracting acrylic acid from the mixture with a solvent mixture comprising ethyl acrylate as the preponderant component thereof and an organic co-solvent selected from the group consisting of toluene, heptane, 1-heptene, methylcyclohexane, cycloheptane, cycloheptadiene, cycloheptatriene, 2,4-dimethyl-1,3 pentadiene, methylcyclohexene and methylenecyclohexene to form an extracted composition; and (b) azeotropically distilling the extracted composition to recover acrylic acid.
    Type: Application
    Filed: January 8, 2002
    Publication date: August 7, 2003
    Inventors: Salvador Aldrett, Diane Elizabeth Allen, Nathan K. Powell, Christopher Lawrence Wilkins, Edmund Jungpiao Yang