Patents by Inventor Lars-Erik Åkerlund

Lars-Erik Åkerlund 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 OF PRODUCING LIGNIN WITH REDUCED AMOUNT OF ODOROUS SUBSTANCES
    Publication number: 20210363309
    Abstract: The present invention relates to a method of producing lignin with reduced amount of guaiacoland etylguaiacol in order to reduce the content of odorous substances by subjecting the ligninto a heating processing order to remove guaiacol.
    Type: Application
    Filed: September 3, 2019
    Publication date: November 25, 2021
    Applicant: VALMET AB
    Inventors: Anders UHLIN, Lars-Erik ÅKERLUND, Anders LITTORIN, Henrik WALLMO
  • METHOD FOR LIGNIN SEPARATION FROM BLACK LIQUOR INVOLVING MULTIPLE ACIDIFICATION STEPS
    Publication number: 20150075738
    Abstract: The method is for separation of lignin from original black liquor (BLIN) and has the following phases in sequence. A first precipitation phase (PR1) for precipitation of lignin by a first acidification of the original black liquor by adding a first acid or mixture of acids (G1a) followed by a first storage phase wherein precipitated lignin particles are allowed to increase in size, followed by a second precipitation phase (PR2) for precipitation of lignin by a further acidification of the original black liquor by adding a second acid or mixture of acids (G1b). By retaining the acidified black liquor for at least 25 minutes in the storage phase are the precipitated lignin particles allowed to grow in size and the filterability is improved considerably.
    Type: Application
    Filed: November 11, 2011
    Publication date: March 19, 2015
    Applicant: Valmet Power AB
    Inventors: Martin Wimby, Mattias Svensson, Henrik Wallmo, Fredrik Öhman, Per Tomani, Lars-Erik Åkerlund