Patents by Inventor Iris Kristalis

Iris Kristalis 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).

  • Method for the recovery of ruthenium from used ruthenium oxide-containing catalysts
    Patent number: 7704469
    Abstract: The invention relates to a process for recovering ruthenium from a used ruthenium-comprising catalyst which comprises ruthenium as ruthenium oxide on a support material which is sparingly soluble in mineral acid, which comprises the steps: a) the catalyst comprising ruthenium oxide is treated in a stream of hydrogen, with ruthenium oxide present on the support being reduced to metallic ruthenium; b) the reduced catalyst from step a) comprising metallic ruthenium on the support material is treated with hydrochloric acid in the presence of an oxygen-comprising gas, with the metallic ruthenium present on the support being dissolved as ruthenium(III) chloride and being obtained as ruthenium(III) chloride solution; c) if appropriate, the ruthenium(III) chloride solution from step b) is worked up further.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: April 27, 2010
    Assignee: BASF Aktiengesellschaft
    Inventors: Olga Schubert, Heiko Urtel, Michael Hesse, Martin Sesing, Claus Hofmann, Iris Kristalis
  • Method for the Recovery of Ruthenium From Used Ruthenium Oxide-Containing Catalysts
    Publication number: 20080293836
    Abstract: The invention relates to a process for recovering ruthenium from a used ruthenium-comprising catalyst which comprises ruthenium as ruthenium oxide on a support material which is sparingly soluble in mineral acid, which comprises the steps: a) the catalyst comprising ruthenium oxide is treated in a stream of hydrogen, with ruthenium oxide present on the support being reduced to metallic ruthenium; b) the reduced catalyst from step a) comprising metallic ruthenium on the support material is treated with hydrochloric acid in the presence of an oxygen-comprising gas, with the metallic ruthenium present on the support being dissolved as ruthenium(III) chloride and being obtained as ruthenium(III) chloride solution; c) if appropriate, the ruthenium(III) chloride solution from step b) is worked up further.
    Type: Application
    Filed: December 21, 2006
    Publication date: November 27, 2008
    Applicant: BASF SE
    Inventors: Olga Schubert, Heiko Urtel, Michael Hesse, Martin Sesing, Claus Hofmann, Iris Kristalis