Patents by Inventor Robert Pestman

Robert Pestman 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 the preparation of a mixture of epsilon caprolactam and/or epsilon caprolactam precursors
    Publication number: 20040030128
    Abstract: Process for the preparation of a mixture of &egr;-caprolactam and &egr;-caprolactam precursors by reductively aminating 5-formylvaleric acid and/or 5-formylvalerate ester(s) in water with hydrogen and an excess of ammonia in the presence of a hydrogenation catalyst, wherein the process is conducted in a reactor of which the inside reactor wall material is a material containing at most 8 wt. % nickel.
    Type: Application
    Filed: July 31, 2003
    Publication date: February 12, 2004
    Inventors: Rudolf Philippus Maria Guit, Mathieu Johannes Guillaume Notten, Robert Pestman
  • Process to continuously prepare an aqueous mixture of &egr;-caprolactam and &egr;-caprolactam precursors
    Patent number: 6452002
    Abstract: Process for preparing an aqueous mixture of &egr;-caprolactam and 6-aminocaproic acid and/or 6-aminocaproamide which involves, as the reductive amination step, contacting 5-formylvaleric acid and/or an alkyl 5-formylvalerate in water as solvent with hydrogen and an excess of ammonia in the presence of a ruthenium on carrier, as a catalyst, wherein the carrier is titanium oxide, zirconium oxide, graphite or carbon and the catalyst also contains at least one of the metals of group 8-11, or a compound of these metals. The aqueous mixture can be used to prepare &egr;-caprolactam.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: September 17, 2002
    Assignees: DSM N.V., E.I. du Pont de Nemours and Company
    Inventors: Robert Pestman, Lambertus H. W. M. Van Lieshout
  • Process to continuously prepare an aqueous mixture of epsilon-caprolactam and epsilon-caprolactam precursors
    Publication number: 20020007058
    Abstract: Process for preparing an aqueous mixture of &egr;-caprolactam and 6-aminocaproic acid and/or 6-aminocaproamide which involves, as the reductive amination step, contacting 5-formylvaleric acid and/or an alkyl 5-formylvalerate in water as solvent with hydrogen and an excess of ammonia in the presence of a ruthenium on carrier, as a catalyst, wherein the carrier is titanium oxide, zirconium oxide, graphite or carbon and the catalyst also contains at least one of the metals of group 8-11, or a compound of these metals. The aqueous mixture can be used to prepare &egr;-caprolactam.
    Type: Application
    Filed: March 1, 2001
    Publication date: January 17, 2002
    Inventors: Robert Pestman, Lambertus H.W.M. Van Lieshout
  • Process to continuously prepare an aqueous mixture of episilon caprolactum and episilon caprolactum precursors
    Patent number: 5877314
    Abstract: This continuous process for preparing an aqueous mixture of .di-elect cons.-caprolactam and 6-aminocaproic acid and/or 6-aminocaproamide by involves, as the reductive amination step, continuously contacting 5-formylvaleric acid or an alkyl 5-formylvalerate in water as solvent with hydrogen and an excess of ammonia in the presence of a ruthenium on carrier, as a catalyst, wherein the carrier is at least one of titanium oxide or zirconium oxide. The aqueous mixture can be used to prepare .di-elect cons.-caprolactam.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: March 2, 1999
    Assignees: DSM N.V., E.I. DuPont de Nemours and Company
    Inventors: Frank E. Herkes, Robert Pestman, Jeroen A.F. Boogers