Patents by Inventor Demetrios N. Zervoudis

Demetrios N. Zervoudis 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).

  • Process for preparing aromatic amines
    Patent number: 7122701
    Abstract: Aromatic amines are produced from aromatic hydrocarbons by a) reacting the aromatic hydrocarbon(s) with a mixture of nitric acid and sulfuric acid to generate a two-phase reaction mixture, b) separating the reaction mixture into an aqueous acid phase and an organic phase containing the nitroaromatic compounds c) washing the organic phase to purify the nitroaromatic compound(s), d) hydrogenating the nitroaromatic compound(s) in the presence of a catalyst to produce the aromatic amine(s) and water of reaction, and e) separating the water of reaction formed in step d) from the aromatic amine(s), in which the water of reaction separated in step e) is used to wash the organic phase containing the nitroaromatic compounds in step c).
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: October 17, 2006
    Assignees: Bayer Aktiengesellschaft, Bayer Materialscience LLC
    Inventors: Berthold Keggenhoff, Karl R. Sittkus, Claudia Mueller, Demetrios N. Zervoudis
  • Process for preparing aromatic amines
    Publication number: 20040249213
    Abstract: Aromatic amines are produced from aromatic hydrocarbons by
    Type: Application
    Filed: June 4, 2003
    Publication date: December 9, 2004
    Inventors: Berthold Keggenhoff, Karl R. Sittkus, Claudia Mueller, Demetrios N. Zervoudis