Patents by Inventor Hanna Kristina Karlsson

Hanna Kristina Karlsson 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 precipitating lignin from black liquor by utilizing waste gases
    Patent number: 9067959
    Abstract: The method is for separation of lignin from original black liquor. Lignin is precipitated in a first acidification stage followed by dewatering a first lignin suspension while forming a first filter cake. The first lignin filter cake is suspended in a second acidification stage whereupon a second lignin suspension is obtained. The second lignin suspension is dewatered to form a second filter cake. The second filter cake is washed and the washed second lignin cake is dewatered to obtain a lignin product. Waste gases from the second acidification stage is recirculated back to the first acidification stage and mixed with the original black liquor.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: June 30, 2015
    Assignee: VALMET POWER AB
    Inventors: Anders Littorin, Henrik Wallmo, Hanna Kristina Karlsson, Martin Wimby
  • METHOD FOR PRECIPITATING LIGNIN FROM BLACK LIQUOR BY UTILIZING WASTE GASES
    Publication number: 20140275498
    Abstract: The method is for separation of lignin from original black liquor. Lignin is precipitated in a first acidification stage followed by dewatering a first lignin suspension while forming a first filter cake. The first lignin filter cake is suspended in a second acidification stage whereupon a second lignin suspension is obtained. The second lignin suspension is dewatered to form a second filter cake. The second filter cake is washed and the washed second lignin cake is dewatered to obtain a lignin product. Waste gases from the second acidification stage is recirculated back to the first acidification stage and mixed with the original black liquor.
    Type: Application
    Filed: June 10, 2009
    Publication date: September 18, 2014
    Inventors: Anders Littorin, Henrik Wallmo, Hanna Kristina Karlsson, Martin Wimby