Patents by Inventor Kristina Ekenberg

Kristina Ekenberg 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 manufacture of diethylenetriamine and higher polyethylenepolyamines
    Patent number: 7053247
    Abstract: The invention relates to a process for the manufacture of diethylenetriamine and higher polyethylenepolyamines by a transamination of ethylenediamine. The transamination is performed at a temperature from 135° C. to 180° C. at a pressure from 5 Mpa to 40 Mpa in the presence of hydrogen and a particulate catalysts containing 26 to 65% by weight of nickel on an oxide carrier. A high conversion degree of ethylenediamine and a high selectivity to form acyclic polyethylenepolyamines, such as diethylenetriamine are obtained by the process. The formation of cyclic amine compounds, e.g. piperazine, is low.
    Type: Grant
    Filed: July 5, 2002
    Date of Patent: May 30, 2006
    Assignee: Akzo Nobel N.V.
    Inventors: Johan Lif, Kristina Ekenberg
  • Process for the manufacture of diethylenetriamine and higher polyethylenepolyamines
    Publication number: 20040171884
    Abstract: The invention relates to a process for the manufacture of diethylenetriamine and higher polyethylenepolyamines by a transamination of ethylenediamine. The transamination is performed at a temperature from 135° C. to 180° C. at a pressure from 5 Mpa to 40 Mpa in the presence of hydrogen and a particulate catalysts containing 26 to 65% by weight of nickel on an oxide carrier. A high conversion degree of ethylenediamine and a high selectivity to form acyclic polyethylenepolyamines, such as diethylenetriamine are obtained by the process. The formation of cyclic amine compounds, e.g. piperazine, is low.
    Type: Application
    Filed: January 21, 2004
    Publication date: September 2, 2004
    Inventors: Johan Lif, Kristina Ekenberg