Patents Assigned to Kamyr A.B.
  • Method for bleaching of high consistency cellulosic pulp
    Patent number: 3992250
    Abstract: A method for bleaching pulp comprising the steps of dewatering or thickening the pulp to a solids concentration of about 30-40 percent, and then treating the pulp with a first treatment liquid, in a vessel, having between 3 and 10 grams of chlorine gas dissolved therein, corresponding to a charge of 20-80 kg of chlorine per ton of pulp resulting in a solids concentration of the treated pulp of 6-15 percent. Treatment with a second liquid in the vessel and other treatment steps may also be performed.
    Type: Grant
    Filed: March 21, 1975
    Date of Patent: November 16, 1976
    Assignee: Kamyr A.B.
    Inventors: Punya B. Chaudhuri, Nils G. Norberg