Patents by Inventor Karl-Heinz Renkel

Karl-Heinz Renkel 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).

  • Patent number: 6107513
    Abstract: A process for the production of a catalyst for preparing vinyl acetate in the gas phase from ethylene, acetic acid and oxygen or oxygen-containing gases which catalyst comprises palladium and/or its compounds, gold and/or its compounds and also alkali metal compounds on a particulate, porous support obtained bya) impregnating the support with soluble palladium and gold compounds,b) converting the soluble palladium and gold compounds into insoluble palladium and gold compounds by addition of an alkaline solution to the support.c) reducing the insoluble palladium and gold compounds on the support with a reducing agent in the liquid or gaseous phase,d) impregnating the support with at least one soluble alkali metal compound ande) finally drying the support at a maximum of 150.degree. C.,wherein the catalyst is brought into contact with at least one peroxidic compound in step b).
    Type: Grant
    Filed: June 24, 1999
    Date of Patent: August 22, 2000
    Assignee: Celanese GmbH
    Inventors: Bernhard Herzog, Roswitha Stein, Karl-Heinz Renkel
  • Patent number: 5972824
    Abstract: A process for the production of a catalyst for preparing vinyl acetate in the gas phase from ethylene, acetic acid and oxygen or oxygen-containing gases which catalyst comprises palladium and/or its compounds, gold and/or its compounds and also alkali metal compounds on a particulate, porous support obtained bya) impregnating the support with soluble palladium and gold compounds,b) converting the soluble palladium and gold compounds into insoluble palladium and gold compounds by addition of an alkaline solution to the support,c) reducing the insoluble palladium and gold compounds on the support with a reducing agent in the liquid or gaseous phase,d) impregnating the support with at least one soluble alkali metal compound ande) finally drying the support at a maximum of 150.degree. C.,wherein the catalyst is brought into contact with at least one peroxidic compound in step b).
    Type: Grant
    Filed: December 2, 1998
    Date of Patent: October 26, 1999
    Assignee: Celanese GmbH
    Inventors: Bernhard Herzog, Roswitha Stein, Karl-Heinz Renkel