Patents by Inventor Norbert Leetsch

Norbert Leetsch 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 producing an aqueous solution hydroxylamine
    Patent number: 7425247
    Abstract: This invention relates to a method for producing an aqueous solution of free hydroxylamine (HA) by simultaneous countercurrent treatment of a HA salt with ammonia or ammonia water, then separating the HA by distillation and reconcentrating the aqueous HA solution in a countercurrent with a stripping medium. The stripping medium used according to the invention is a mixture of steam and a non-condensable inert gas and the process temperature at a defined pressure is controlled by the quantity of non-condensable inert gas at the column inlet. The preferred non-condensable inert gas is nitrogen. This results in increased safety and a reduction in losses of the method for producing aqueous solutions of free HA.
    Type: Grant
    Filed: February 13, 2004
    Date of Patent: September 16, 2008
    Assignee: Domo Caproleuna GmbH
    Inventors: Norbert Leetsch, Thomas Strecker, Manfred Kretschmar, Joachim Seidler
  • Method for the productiong of an aqueous hydroxylamine solution
    Publication number: 20060032734
    Abstract: This invention relates to a method for producing an aqueous solution of free hydroxylamine (HA) by simultaneous countercurrent treatment of a HA salt with ammonia or ammonia water, then separating the HA by distillation and reconcentrating the aqueous HA solution in a countercurrent with a stripping medium. The stripping medium used according to the invention is a mixture of steam and a non-condensable inert gas and the process temperature at a defined pressure is controlled by the quantity of non-condensable inert gas at the column inlet. The preferred non-condensable inert gas is nitrogen. This results in increased safety and a reduction in losses of the method for producing aqueous solutions of free HA.
    Type: Application
    Filed: February 13, 2004
    Publication date: February 16, 2006
    Applicant: DOMO Caproleuna GmbH
    Inventors: Norbert Leetsch, Thomas Strecker, Joachim Seidler