Patents by Inventor David Lee Sikkenga

David Lee Sikkenga 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).

  • CONVERSION OF POLYSTYRENE TO BENZOIC ACID
    Publication number: 20200140367
    Abstract: Polystyrene-containing polymers are converted to benzoic acid by catalytic oxidation of dissolved polystyrene under elevated temperature and pressure. The produced benzoic acid is recovered by evaporation.
    Type: Application
    Filed: July 10, 2018
    Publication date: May 7, 2020
    Inventor: David Lee Sikkenga
  • Conversion of polystyrene to benzoic acid
    Patent number: 10259769
    Abstract: Polystyrene-containing polymers are converted to benzoic acid by catalytic oxidation of dissolved polystyrene under elevated temperature and pressure. The produced benzoic acid is recovered by evaporation.
    Type: Grant
    Filed: October 13, 2017
    Date of Patent: April 16, 2019
    Inventor: David Lee Sikkenga
  • CONVERSION OF POLYSTYRENE TO BENZOIC ACID
    Publication number: 20190016659
    Abstract: Polystyrene-containing polymers are converted to benzoic acid by catalytic oxidation of dissolved polystyrene under elevated temperature and pressure. The produced benzoic acid is recovered by evaporation.
    Type: Application
    Filed: October 13, 2017
    Publication date: January 17, 2019
    Inventor: David Lee Sikkenga
  • Process for the preparation of 2,5-furan-dicarboxylic acid
    Patent number: 9643945
    Abstract: 2,5-Furandicarboxylic acid and methyl acetate are prepared in a continuous process by introducing a 5-methoxymethylfurfural-containing feedstock, an oxygen-containing gas, an oxidation catalyst and an acetic acid-containing solvent into a reactor; allowing 5-methoxymethylfurfural to react with oxygen and acetic acid in the presence of the oxidation catalyst to yield 2,5-furandicarboxylic acid as main product and methyl acetate; withdrawing 2,5-furandicarboxylic acid-containing product from the reactor and recovering 2,5-furandicarboxylic acid product; and withdrawing a vaporous stream containing methyl acetate from the reactor.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: May 9, 2017
    Assignee: FURANIX TECHNOLOGIES B.V.
    Inventors: Etienne Mazoyer, Ana Sofia Vagueiro De Sousa Dias, Benjamin McKay, Hendrikus Jacob Baars, Victor Peter Charles Vreeken, Gerardus Johannes Maria Gruter, David Lee Sikkenga
  • PROCESS FOR THE PREPARATION OF 2,5-FURAN-DICARBOXYLIC ACID
    Publication number: 20160024039
    Abstract: 2,5-Furandicarboxylic acid and methyl acetate are prepared in a continuous process by introducing a 5-methoxymethylfurfural-containing feedstock, an oxygen-containing gas, an oxidation catalyst and an acetic acid-containing solvent into a reactor; allowing 5-methoxymethylfurfural to react with oxygen and acetic acid in the presence of the oxidation catalyst to yield 2,5-furandicarboxylic acid as main product and methyl acetate; withdrawing 2,5-furandicarboxylic acid-containing product from the reactor and recovering 2,5-furandicarboxylic acid product; and withdrawing a vaporous stream containing methyl acetate from the reactor.
    Type: Application
    Filed: April 4, 2014
    Publication date: January 28, 2016
    Inventors: Etienne Mazoyer, Ana Sofia Vagueiro De Sousa Dias, Benjamin McKay, Hendrikus Jacob Baars, Victor Peter Charles Vreeken, Gerardus Johannes Maria Gruter, David Lee Sikkenga
  • Process for preparing purified carboxylic acids
    Patent number: 6255525
    Abstract: A process for preparing an aromatic carboxylic acid having improved purity comprising contacting at an elevated temperature and pressure a mixture comprising an impure aromatic carboxylic acid and a solvent in the presence of hydrogen gas with a carbon catalyst which is essentially free of a hydrogenation metal component.
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: July 3, 2001
    Assignee: BP Amoco Corporation
    Inventors: David Lee Sikkenga, M. Michelle Morie-Bebel, Stephen V. Hoover