Patents by Inventor Gunter Stevermuer

Gunter Stevermuer 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).

  • Ammoximation of ketones and work-up by pervaporation/vapor permeation
    Patent number: 6639108
    Abstract: A process for the work-up of a reaction mixture formed by ammoximation of a ketone, in particular an alkanone or cycloalkanone, by means of hydrogen peroxide and ammonia in homogeneous solution over a titanium-containing catalyst. It comprises the substeps removal of the catalyst, selective separation of the oxime formed in the ammoximation from the reaction mixture, removal of water of reaction and recirculation of the solvent. The work-up is carried out using at least one membrane separation step and is also successful in the case of incomplete ketone conversion and in the presence of dissolved salts.
    Type: Grant
    Filed: September 3, 2002
    Date of Patent: October 28, 2003
    Assignee: Degussa AG
    Inventors: Thomas Schiffer, Peter Ernst Esser, Martin Roos, Franz-Felix Kuppinger, Günter Stevermüer, Georg Friedrich Thiele
  • Work-up of the ammoximation products of ketones by liquid-liquid extraction in a ternary solvent system
    Patent number: 6620970
    Abstract: The present invention relates to a process for working up an ammoximation reaction mixture, by separating a catalyst from the reaction mixture, removing the ketone oxime product, discharging the water of the reaction, and recirculating a solvent, where the ketone oxime formed is removed in a liquid phase with at least one liquid-liquid extraction in a ternary solvent system.
    Type: Grant
    Filed: September 3, 2002
    Date of Patent: September 16, 2003
    Assignee: Degussa AG
    Inventors: Thomas Schiffer, Peter Ernst Esser, Jörg Krissmann, Martin Roos, Günter Stevermüer, Georg Friedrich Thiele
  • Ammoximation of ketones and work-up by pervaporation/vapor permeation
    Publication number: 20030105356
    Abstract: A process for the work-up of a reaction mixture formed by ammoximation of a ketone, in particular an alkanone or cycloalkanone, by means of hydrogen peroxide and ammonia in homogeneous solution over a titanium-containing catalyst. It comprises the substeps removal of the catalyst, selective separation of the oxime formed in the ammoximation from the reaction mixture, removal of water of reaction and recirculation of the solvent. The work-up is carried out using at least one membrane separation step and is also successful in the case of incomplete ketone conversion and in the presence of dissolved salts.
    Type: Application
    Filed: September 3, 2002
    Publication date: June 5, 2003
    Applicant: DEGUSSA AG
    Inventors: Thomas Schiffer, Peter Ernst Esser, Martin Roos, Franz-Felix Kuppinger, Gunter Stevermuer, Georg Friedrich Thiele
  • Work-up of the ammoximation products of ketones by liquid-liquid extraction in a ternary solvent system
    Publication number: 20030065220
    Abstract: The present invention relates to a process for working up an ammoximation reaction mixture, by separating a catalyst from the reaction mixture, removing the ketone oxime product, discharging the water of the reaction, and recirculating a solvent, where the ketone oxime formed is removed in a liquid phase with at least one liquid-liquid extraction in a ternary solvent system.
    Type: Application
    Filed: September 3, 2002
    Publication date: April 3, 2003
    Applicant: DEGUSSA AG
    Inventors: Thomas Schiffer, Peter Ernst Esser, Jorg Krissmann, Martin Roos, Gunter Stevermuer, Georg Friedrich Thiele