Patents by Inventor Stephanie Bajus

Stephanie Bajus 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 for reactivation of a homogeneous oxidation catalyst
    Patent number: 10994270
    Abstract: The present invention relates to a method for the reactivation of homogeneous catalyst systems from organic reaction mixtures. The catalyst systems are suitable for the oxidation of organic compounds such as, for example, cyclododecene. The reactivation is carried out using an aqueous base.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: May 4, 2021
    Assignee: Evonik Operations GmbH
    Inventors: Ralf Meier, Stephanie Bajus, Jens Döring
  • Method for reactivation of a homogeneous oxidation catalyst
    Publication number: 20190232271
    Abstract: The present invention relates to a method for the reactivation of homogeneous catalyst systems from organic reaction mixtures. The catalyst systems are suitable for the oxidation of organic compounds such as, for example, cyclododecene. The reactivation is carried out using an aqueous base.
    Type: Application
    Filed: June 28, 2017
    Publication date: August 1, 2019
    Applicant: Evonik Degussa GmbH
    Inventors: Ralf MEIER, Stephanie BAJUS, Jens DOERING
  • Catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (?-isophorone) with hydrogen peroxide to afford 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone)
    Patent number: 10093605
    Abstract: The present invention provides a novel process for producing 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone) by catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (?-isophorone) with hydrogen peroxide as the oxidant. In particular, the novel process includes phase transfer reagent in a biphasic system including an organic phase and an aqueous phase wherein the biphasic system includes 1) a tungsten polyoxyometallate as catalyst and hydrogen peroxide, and/or 2) a mixture of a) a mineral acid, b) hydrogen peroxide, and c) a metal tungstate.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: October 9, 2018
    Assignee: Evonik Degussa GmbH
    Inventors: Stephanie Bajus, Jan Caßens, Jens Döring, Jörg-Joachim Nitz, Stephan Kohlstruk, Robert Jansen
  • CATALYTIC OXIDATION OF 3,5,5-TRIMETHYLCYCLOHEXA-3-ENE-1-ONE (ß-ISOPHORONE) WITH HYDROGEN PEROXIDE TO AFFORD 2,6,6-TRIMETHYL-2-CYCLOHEXENE-1,4-DIONE (KETO-ISOPHORONE)
    Publication number: 20180155264
    Abstract: The present invention provides a novel process for producing 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone) by catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (?-isophorone) with hydrogen peroxide as the oxidant. In particular, the novel process includes phase transfer reagent in a biphasic system including an organic phase and an aqueous phase wherein the biphasic system includes 1) a tungsten polyoxyometallate as catalyst and hydrogen peroxide, and/or 2) a mixture of a) a mineral acid, b) hydrogen peroxide, and c) a metal tungstate.
    Type: Application
    Filed: November 27, 2017
    Publication date: June 7, 2018
    Inventors: Stephanie Bajus, Jan Caßens, Jens Döring, Jörg-Joachim Nitz, Stephan Kohlstruk, Robert Jansen