Oxygen delignification of wood pulp

Details Oxygen delignification of wood pulp Oxygen delignification of wood pulp

D - Textiles, Paper

21

C

9/16.5

D21C 3/02 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1122756

OXYGEN DELIGNIFICATION OF WOOD PULP ABSTRACT OF THE DISCLOSURE In a process for delignifying wood pulp with oxygen, a pulp slurry and oxygen are introduced into an elongated reactor having a plurality of gravitational fall zones at which oxygen is dissolved in the liquid phase of the slurry. The length of the reactor is sufficient to provide the resi- dence time required for delignification reactions. Alkali is added in controlled quantities along the reactor length in re- sponse to sensed slurry pH to maintain a predetermined slurry pH throughout the reactor. The oxygen treated slurry discharged from the reactor is separated into pulp and hot recycle liquor, the latter being utilized to effect thermal, chemical and water economies.

311675

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