Patents Assigned to L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Calude
  • Method of reducing fluorescence in deinked pulp by treating pulp with ozone and a bleaching agent
    Patent number: 5529660
    Abstract: Provided herewith is a process for reducing the fluorescence of pulp fibers. The process comprises contacting the pulp fibers with ozone in two or more stages, with an intermediate washing stage or bleaching stage preferably being conducted in between the ozone contacting stages. It has been discovered that splitting the total ozone charge into two or more stages provides a much more efficient and effective process for reducing fluorescence.
    Type: Grant
    Filed: April 15, 1994
    Date of Patent: June 25, 1996
    Assignee: L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Calude
    Inventors: Jack Kogan, Michelle Steiner