Patents by Inventor Hans-Joachim Raatz

Hans-Joachim Raatz 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).

  • Continuous adiabatic process for preparing nitrochlorobenzene
    Patent number: 6586645
    Abstract: The present invention relates to a continuous adiabatic process for preparing nitrochlorobenzene, in which the waste sulfuric acid produced during the practice of the process is reconcentrated and recycled into the nitration reaction.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: July 1, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ralf Demuth, Bernd-Michael König, Thomas Linn, Hans-Joachim Raatz, Hans-Martin Weber, Eberhard Zirngiebl, Ricarda Leiberich
  • Continuous adiabatic procss for preparing nitrochlorobenzene
    Publication number: 20020161269
    Abstract: The present invention relates to a continuous adiabatic process for preparing nitrochlorobenzene, in which the waste sulfuric acid produced during the practice of the process is reconcentrated and recycled into the nitration reaction.
    Type: Application
    Filed: February 19, 2002
    Publication date: October 31, 2002
    Inventors: Ralf Demuth, Bernd-Michael Konig, Thomas Linn, Hans-Joachim Raatz, Hans-Martin Weber, Eberhard Zirngiebl, Ricarda Leiberich
  • Process for the adiabatic preparation of 3,4-dichloronitrobenzene
    Patent number: 6353142
    Abstract: 1,2-Dichlorobenzene can be reacted very selectively under adiabatic reaction conditions to give 3,4-dichloronitrobenzene by intensively mixing 1,2-dichlorobenzene with nitric acid, sulphuric acid and water, simultaneously or successively, in their total amount, using a mixing energy of 1-50 watts per litre of the total reaction mixture, preferably 3-30 W/l, and maintaining a temperature of from 0 to 60° C. during mixing.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: March 5, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Eberhard Zirngiebl, Bernd-Michael König, Hans-Martin Weber, Thomas Linn, Hans-Joachim Raatz
  • Method for producing aromatic nitro compounds
    Patent number: 6242657
    Abstract: In the reaction of aromatic compounds with nitrating acids comprising HNO3 and, if appropriate, H2SO4 and/or H2O and/or H3PO4 to form aromatic nitro compounds, according to the invention an amount of from 0.5 to 20,000 ppm of one or more surface-active substances from the group of the anionic, cationic, zwitterionic or nonionic surface-active substances is added to the reaction mixture.
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: June 5, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd-Michael König, Johannes Dühr, Hans-Joachim Raatz, Manfred Kaczorowski