Patents Assigned to Kwei-Nam Law
  • Patent number: 5114540
    Abstract: An apparatus for chemical treatment of lignocellulosic materials comprises two concentric compartments, the inner one is used for chemical reaction whereas the outer is used for generation of hot water or steam. The top and the bottom of the outer compartment is closed and connected to the inner one. These two are interconnected by two steam conduits. The inner compartment is also connected to a circulation pump and a heat exchanger. The bottom of this inner compartment is equipped with a quick-release valve which may be used to execute explosive discharge of the treated lignocellulosic material. On top of said apparatus is a cover which allows experiments to be performed under pressurized conditions. For experimentation, lignocellulosic material in form of chips (large particles) may be treated either with heated chemical solution or steam. Materials in form of fibers (fine particles) may be treated by means of vapor or by heat conduction furnished by the outer compartment.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: May 19, 1992
    Assignees: Kwei-Nam Law, Jacques L. Valade
    Inventor: Kwei-Nam Law