Patents Assigned to Canadian Liquid Air/Air Liquide Canada LTEE
  • Method of monitoring and recovering oxygen-rich gas from ozone bleaching
    Patent number: 5688367
    Abstract: A method and installation for bleaching a lignocellulosic pulp with ozone, while recovering an oxygen-rich gas which may be recycled or re-used. Bleaching of the pulp with ozone is preferably carried out under conditions in which ingress of air is prevented. In a multi-step bleaching process, an oxygen-rich vent gas typically containing at least 90%, by weight, of oxygen may be recovered from a second contactor for potential use in different oxygen-consuming operations in a pulp mill.
    Type: Grant
    Filed: December 11, 1995
    Date of Patent: November 18, 1997
    Assignee: Canadian Liquid Air/Air Liquide Canada LTEE
    Inventors: Derek Hornsey, Gordon H. Homer, John R. Ayton