Patents by Inventor Guenther Kohler

Guenther Kohler 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: 7700805
    Abstract: An amine is prepared by cleaving a carbamate of the formula I wherein R1=hydrogen, alkyl, aryl or phenyl group, R2=alkyl, aryl or phenyl group, wherein R1 and R2 are independently substituted or unsubstituted, wherein the cleaving of the carbamate is performed in the presence of an acid of the formula II wherein R3, R4 and R5 are independently alkyl or phenyl group, wherein R1, R2, R3, R4 and R5 are the same or different.
    Type: Grant
    Filed: May 12, 2008
    Date of Patent: April 20, 2010
    Assignee: Evonik Degussa GmbH
    Inventors: Günther Köhler, Manfred Neumann, Marianne Omeis
  • Patent number: 7385092
    Abstract: A process for preparing diols or triols made up of a1) reacting at least one monoolefin having 4 to 20 carbon atoms with hydrogen peroxide and formic acid in the presence of water to form a mixture or a2) reacting at least one monoolefin alcohol having 4 to 20 carbon atoms first with formic acid, and then reacting the product formed thereby with hydrogen peroxide in the presence of water to form a mixture, b) removing, by distillation, the water and formic acid from the mixture obtained in a1) or a2), c) reacting the mixture obtained from b) with an aliphatic alcohol in the presence of a sulfonic acid to form the diol or triol and at least one formic ester by-product, and d) optionally removing, by distillation, the at least one formic ester by-product formed together with any residual at least one aliphatic C1-C4-alcohol to isolate the diol or triol.
    Type: Grant
    Filed: December 15, 2005
    Date of Patent: June 10, 2008
    Assignee: Degussa AG
    Inventors: Clemens Osterholt, Volker Brehme, Thomas Kübelbäck, Günther Köhler
  • Patent number: 7208640
    Abstract: A process for isolating purified 2-methoxypropene from a mixture which comprises 2,2-dimethoxypropane, 2-methoxypropene, methanol, acetone, and optionally other carbonyl group-containing compounds, which process involves subjecting the mixture to distillation, adding 2-aminoethanol and at least one base as assistants in the distillation, and isolating purified 2-methoxypropene.
    Type: Grant
    Filed: April 28, 2005
    Date of Patent: April 24, 2007
    Assignee: Degussa AG
    Inventors: Günther Köhler, Volker Brehme, Manfred Neumann, Clemens Osterholt
  • Patent number: 6958421
    Abstract: A salt-free process for preparing cyclobutanone, including isomerizing cyclopropylmethanol, preferably in aqueous solution, in the presence of an acidic heterogeneous catalyst to form cyclobutanol and, preferably after extraction and removal of the extractant, dehydrogenating the cyclobutanol over a heterogeneous catalyst.
    Type: Grant
    Filed: June 13, 2003
    Date of Patent: October 25, 2005
    Assignee: Degussa AG
    Inventors: Kerstin Bodmann, Manuela Imig, Günther Köhler, Karl-Heinz Brühl
  • Patent number: 6313356
    Abstract: A process for the preparation of cyclooctanol from cyclooctene comprising: a. reaction of cyclooctene with formic acid in the absence of an added catalyst to produce a two-phase reaction mixture containing cyclooctyl formate and residual formic acid, b. separation of the two phases into a lower phase rich in formic acid (phase A) and an upper phase low in formic acid (phase B), c. extraction of cyclooctyl formate from phase A to obtain an extract, d. combination of phase B and the extract from phase A, e. distillative work-up of the combination of phase B and the extract from phase A in an apparatus fitted with a short distillation path to obtain crude cyclooctyl formate, and f. catalytic transesterification of the cyclooctyl formate of said crude cyclooctyl formate with an alcohol to produce cyclooctanol.
    Type: Grant
    Filed: September 18, 2000
    Date of Patent: November 6, 2001
    Assignee: Degussa Huels AG
    Inventors: Guenther Kohler, Manfred Kaufhold, Renate Paulczynski, Michael Beuth