Method of bleaching or delignification of cellulose pulp...

Details Method of bleaching or delignification of cellulose pulp... Method of bleaching or delignification of cellulose pulp...

D - Textiles, Paper

21

C

8/78.1

D21C 9/147 (2006.01) B01F 5/04 (2006.01) B01J 8/22 (2006.01)

Patent

CA 1300322

METHOD OF BLEACHING OR DELIGNIFICATION OF CELLULOSE PULP WITH OXYGEN ABSTRACT A continuous method of bleaching or delignification of cellulose pulp with oxygen. The pulp in the form of an aqueous slurry is passed through a diffusing and mixing conduit at a velocity at which it behaves as a turbulent liquid and then through a holding vessel at a velocity at which it assumes plug flow. An oxygen-steam mixture is diffused through a microporous wall interfacing with the slurry in the conduit to form a mass of small oxygen bubbles from which the steam condenses imparting heat to the slurry and leaving the oxygen in the form of smaller bubbles dispersed throughout the slurry, presenting a total surface area markedly greater than bubbles resulting from the injection of oxygen alone through the same microporous wall under the same conditions. The oxygen bubbles remain dispersed throughout the slurry when it assumes plug flow, to give time for the oxygen to exert its bleaching effect. Apparatus for carrying out the method.

539056

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