Patents by Inventor Thomas Preisss

Thomas Preisss 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).

  • Publication number: 20080091049
    Abstract: The invention relates to a method for producing xylylenediamine, comprising the following steps: ammonoxidation of xylol to form phthalodinitrile and hydrogenation of the phthalodinitrile, whereby the vaporous product of the ammonoxidation stage is directly brought into contact with a liquid organic solvent or with melted phthalodinitrile (quench); constituents having a boiling point lower than that of phthalodinitrile (low boilers) are partially or completely separated out from the obtained quench solution or suspension or phthalodinitrile melt, and; before the hydrogenation of the phthalodinitrile, no products having a boiling point higher than that of phthalodinitrile (high boilers) are separated out.
    Type: Application
    Filed: September 4, 2004
    Publication date: April 17, 2008
    Applicant: BASF Aktiengesellschaft
    Inventors: Randolf Hugo, Sabine Jourdan, Kirsten Wenz, Thomas Preisss, Alexander Weck