Apparatus and method for medium consistency oxygen...

Details Apparatus and method for medium consistency oxygen... Apparatus and method for medium consistency oxygen...

D - Textiles, Paper

21

C

92/59, 9/16.5

D21C 3/02 (2006.01) B01F 15/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1167205

BFN 6840 APPARATUS AND METHOD FOR MEDIUM CONSISTENCY OXYGEN DELIGNIFICATION OF PULP Abstract of the Disclosure Medium consistency oxygen delignification of pulp is carried out in a series of tubular reaction zones. Rapid delignification is achieved by agitating the pulp by rotating a timing screw in the first reaction zone at a speed in excess of 10 rpm, modifying the flights on the timing screw to increase the amount of agitation, or a combination of the two. Primary oxygenation is carried out in the first reaction zone while subsequent zones provide the retention time needed for the delignification reaction to go to completion. A thick stock pump is used to introduce the pulp into the first reaction zone.

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