Patents by Inventor Viveka Svensson

Viveka Svensson 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 treating process water in connection with pulp bleaching
    Patent number: 6290812
    Abstract: A method treats process water containing metal ions, in connection with bleaching of lignocellulosic pulp. The method is characterized by the steps of a) adjusting the Mg2+ content of the process water to form a flocculating base for metals and an organic substance; b) supplying a carbonate source to the process water to precipiate calcium as calcium carbonate; c) increasing the pH of the process water by adding white liquor to precipipate metals such as metal hydroxides; d) adding a flocculating agent to the process water; and e) separating the precipitated, flocculated metal compounds from the process water by flotation.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: September 18, 2001
    Assignee: Kemira Kemi AB
    Inventors: Christos Rampotas, Viveka Svensson, Jonny Hansson, Margareta Nilsson