Split alkali addition for high consistency oxygen...

Details Split alkali addition for high consistency oxygen... Split alkali addition for high consistency oxygen...

D - Textiles, Paper

21

C

D21C 3/02 (2006.01) D21C 9/10 (2006.01) D21C 9/147 (2006.01)

Patent

CA 2077433

ABSTRACT OF THE DISCLOSURE Unbleached pulp (8) is combined with an aqueous alkaline solution (10) while in a state of low consistency to distribute a first amount of alkaline material substantially uniformly throughout the pulp. The consistency of the pulp is then increased to above about 20 % (12). Additional alkali (18) is applied onto the high consistency pulp (17) to provide a total amount of between 0.8 and 7 % by weight of oven dry pulp. The high consistency alkali containing pulp is then treated with oxygen (21) to effect delignification (20). High strength, low lignin pulps are formed which may be further bleached (25) to high brightness with reduced amounts of chemicals by following the methods of the invention.

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