Patents Represented by Attorney, Agent or Law Firm Godffied R. Akorli
  • Continuous isothermal process for preparing mononitrotoluenes in the presence of phosphoric acid
    Patent number: 6768032
    Abstract: The present invention relates to a continuous isothermal process for preparing mononitrotoluenes in the presence of a mixed acid component comprising mixtures of sulfuric acid and phosphoric acid with concentration of the resultant waste acid and recycling of the concentrated waste acid to the process.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: July 27, 2004
    Assignee: Bayer Chemicals AG
    Inventors: Matthias Gotta, Ralf Demuth, Eberhard Zirngiebl, Hans-Martin Weber, Georg Ronge