Patents by Inventor Wolfgang Kohlmann

Wolfgang Kohlmann 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).

  • Preparation of alkylamines
    Patent number: 6806379
    Abstract: A continuous process for preparing alkylamines comprises reacting continuous streams of ammonia and alkyl halide in a molar ratio of at least 10:1 in a pressure reactor. The ultimate reaction mixture has a temperature of >80° C., a pressure of >40 bar and an ammonium halide content of >1% by weight, and comprises two phases (A) a first phase comprising at least 75% by weight of the total amount of ammonium halide formed, and (B) a second phase comprising at least 80% by weight of the total amount of alkylamine formed. The first and second phases are separated, and an alkylamine product is recovered therefrom.
    Type: Grant
    Filed: December 30, 2002
    Date of Patent: October 19, 2004
    Assignee: Consortium fuer elektrochemische Industries GmbH
    Inventors: Andreas Bauer, Herbert Jekat, Jochen Rauch, Peter John, Wolfgang Kohlmann, Volker Frey, Bernd Pachaly
  • Process for preparing saturated carboxylic acids having from 1 to 4 carbon atoms
    Patent number: 6692706
    Abstract: A process for preparing saturated carboxylic acids having from 1 to 4 carbon atoms at a reaction temperature of from 100° C. to 400° C. and pressures of from 1.2×105 Pa to 51×105 Pa by gas phase oxidation of saturated and/or unsaturated C4-hydrocarbons, with an oxygen-containing gas and water vapor in the presence of at least one catalyst. The gas leaving the reactor is partly recirculated in a reaction gas circuit. This reaction gas circuit is configured such that part of the organic acids formed in the gas-phase oxidation is taken from the gas leaving the reactor so that the acid content of the recirculated part of the gas leaving the reactor is from 0.01% to 6.0% by volume.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: February 17, 2004
    Assignee: Consortium für elekrochemische Industrie GmbH
    Inventors: Christoph Ruedinger, Hans-Juergen Eberle, Ragnar Bogner, Wolfgang Kohlmann
  • Preparation of alkylamines
    Publication number: 20030130543
    Abstract: A continuous process for preparing alkylamines comprises reacting continuous streams of ammonia and alkyl halide in a molar ratio of at least 10:1 in a pressure reactor. The ultimate reaction mixture has a temperature of >80° C.
    Type: Application
    Filed: December 30, 2002
    Publication date: July 10, 2003
    Applicant: Consortium fur elektrochemische Industrie GmbH
    Inventors: Andreas Bauer, Herbert Jekat, Jochen Rauch, Peter John, Wolfgang Kohlmann, Volker Frey, Bernd Pachaly
  • Process for preparing saturated carboxylic acids having from 1 to 4 carbon atoms
    Publication number: 20020177734
    Abstract: A process for preparing saturated carboxylic acids having from 1 to 4 carbon atoms at a reaction temperature of from 100° C. to 400° C. and pressures of from 1.2×105 Pa to 51×105 Pa by gas phase oxidation of saturated and/or unsaturated C4-hydrocarbons, with an oxygen-containing gas and water vapor in the presence of at least one catalyst. The gas leaving the reactor is partly recirculated in a reaction gas circuit. This reaction gas circuit is configured such that part of the organic acids formed in the gas-phase oxidation is taken from the gas leaving the reactor so that the acid content of the recirculated part of the gas leaving the reactor is from 0.01% to 6.0% by volume.
    Type: Application
    Filed: June 12, 2002
    Publication date: November 28, 2002
    Applicant: Consortium Fur Elektrochemische Industrie GmbH
    Inventors: Christoph Ruedinger, Hans-Juergen Eberle, Ragnar Bogner, Wolfgang Kohlmann
  • Process for preparing saturated carboxylic acids having from 1 to 4 carbon atoms from butenes and butanes
    Patent number: 6429331
    Abstract: A process for preparing saturated carboxylic acids having from 1 to 4 carbon atoms at a reaction temperature of from 100° C. to 400° C. and pressures of from 1.2×105 Pa to 51×105 Pa by gas phase oxidation of saturated and/or unsaturated C4-hydrocarbons, with an oxygen-containing gas and water vapor in the presence of at least one catalyst. The gas leaving the reactor is partly recirculated in a reaction gas circuit. This reaction gas circuit is configured such that part of the organic acids formed in the gas-phase oxidation is taken from the gas leaving the reactor so that the acid content of the recirculated part of the gas leaving the reactor is from 0.01% to 6.0% by volume.
    Type: Grant
    Filed: May 18, 1999
    Date of Patent: August 6, 2002
    Assignee: Consortium für elektrochemische Industrie GmbH
    Inventors: Christoph Ruedinger, Hans-Juergen Eberle, Ragnar Bogner, Wolfgang Kohlmann