Patents Assigned to Board of Reagents, University of Washington
  • Method and system for selective alkaline defiberization and delignification
    Patent number: 4329200
    Abstract: A method is provided for selectively defiberizing and delignifying lignocellulose employing a novel alkaline pulping system. The subject pulping system includes a pulping liquor comprising water, a water-miscible organic reagent, and a sulfide or bisulfide compound selected from the group consisting of alkali metal sulfides and bisulfides, ammonium sulfide and ammonium bisulfide. Extremely high pulp yields as compared to kraft pulping are provided by employing the method and system of this invention.
    Type: Grant
    Filed: June 2, 1980
    Date of Patent: May 11, 1982
    Assignee: Board of Reagents, University of Washington
    Inventor: Kyosti V. Sarkanen