Patents by Inventor Klaus Stadtmuller

Klaus Stadtmuller 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).

  • Publication number: 20080316858
    Abstract: The present invention relates to an oscillatory flow mixing reactor (OPM) oscillatory flow which is designed so that a flow with angular momentum is superposed by means effecting circular acceleration on the mixture flowing in with oscillation, with the result that good mixing of the individual phases of the mixture is achieved with the use of low shear forces. A use of the reactor according to the invention is also disclosed.
    Type: Application
    Filed: February 13, 2006
    Publication date: December 25, 2008
    Applicant: DEGUSSA GMBH
    Inventors: Heidi Gron, Rudiger Schutte, Karlheinz Drauz, Klaus Stadtmuller, James Ian Grayson
  • Publication number: 20050148797
    Abstract: The invention relates to a process for increasing the selectivity of the hydrogenation of 4,4?-diaminodiphenylmethane (4,4?-MDA) to diaminodicyclohexylmethane (4,4?-HMDA) by catalytic hydrogenation of a mixture containing 4,4?-MDA as the main component and its mono-N-methyl derivative as a secondary component. According to the invention, the hydrogenation is terminated before a conversion of 4,4?-MDA to 4,4?-HMDA of 99% is achieved. Under these conditions, a substantially smaller proportion of the N-methyl-4,4?-MDA is hydrogenated to N-methyl-4,4-HMDA.
    Type: Application
    Filed: June 25, 2003
    Publication date: July 7, 2005
    Inventors: Bernd Jaeger, Thomas Haas, Guido Stochniol, Christian Lettmann, Willi Hofen, Klaus Stadtmuller, Jorg Lotz
  • Patent number: 6011179
    Abstract: A process for the production of primary and/or secondary amines from imines or nitriles, comprising an aminating hydrogenation of imine or of nitrile with hydrogen in the presence of ammonia, of a hydrogenation catalyst based on cobalt, nickel, ruthenium or mixtures of these metals and of a base, at a temperature within the range of 50.degree. C. to 200.degree. C. and at a pressure within the range of 0.3 to 30 MPa. The yield of amine is increased by the use of a quaternary ammonium hydroxide as base. Preferably a tetraalkylammonium hydroxide is used in a quantity of from 0.01 to 100 mMol per mol of amine or of nitrile. The process is suitable in particular for the production of isophoronediamine from isophorone nitrile imine.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: January 4, 2000
    Assignee: Degussa-Huls AG
    Inventors: Thomas Haas, Karl Ludwig Weber, Klaus Stadtmuller, Willi Hofen, Rudolf Vanheertum