Patents by Inventor Anna K. Skogby

Anna K. Skogby 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).

  • Reduction of halogenated organic compounds in spent bleach liquor
    Patent number: 5149442
    Abstract: The present invention relates to a method of reducing the content of halogenated organic compounds in the spent bleach liquor from the bleaching of lignocellulose-containing material with compounds containing halogen, wherein the spent bleach liquor, in a stage where no essential delignification or bleaching of the pulp takes place, is maintained at a pH of from 2.5 up to about 10, and wherein the residence time and the temperature are selected such that the amount of dissolved halogenated organic substances in the spent bleach liquor is reduced by at least 30%.
    Type: Grant
    Filed: April 23, 1991
    Date of Patent: September 22, 1992
    Assignee: Eka Nobel AB
    Inventors: Mats G. Nystrom, Kenneth O. Larsson, Anna K. Skogby, Solvie M. Herstad