Patents by Inventor Denis Rachez

Denis Rachez 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 primary diamines
    Patent number: 7939691
    Abstract: Primary diamines are prepared by hydrogenation of a dinitrile compound in the presence of a catalyst, in particular hexamethylenediamine is prepared by hydrogenation of adiponitrile; the product diamines are recovered by distillation in several distillation columns mounted in series and the heavy impurities are separated from the second distillation.
    Type: Grant
    Filed: June 15, 2007
    Date of Patent: May 10, 2011
    Assignee: Rhodia Operations
    Inventors: Daniel Amoros, Denis Rachez