Patents by Inventor Ralf Duessel

Ralf Duessel 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).

  • Patent number: 7432407
    Abstract: The invention relates to a process by which C4- to C6-olefins or an essentially sulfur-free olefin cut comprising C4- to C6-olefins is isomerized over a catalyst comprising an element of the eighth transition group of the Periodic Table, in the presence of at least one added sulfur compound, and any polyunsaturated hydrocarbons contained therein are selectively hydrogenated and hydroisomerized, and also the sulfur compounds are separated from the product and optionally recycled, so that virtually sulfur-free products are obtained.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: October 7, 2008
    Assignee: OXENO Olefinchemie GmbH
    Inventors: Andreas Beckmann, Armin Rix, Udo Knippenberg, Franz Nierlich, Wilfried Bueschken, Ralf Duessel