Pulp alkali addition process for high consistency oxygen...

Details Pulp alkali addition process for high consistency oxygen... Pulp alkali addition process for high consistency oxygen...

D - Textiles, Paper

21

C

D21C 3/02 (2006.01) D21C 9/00 (2006.01) D21C 9/10 (2006.01) D21C 9/147 (2006.01)

Patent

CA 2069447

Unbleached pulp is combined with an aqueous alkaline solution while in a state of low consistency to distribute a first amount of alkaline material sub- stantially uniformly throughout the pulp. The consistency of the pulp is then increased to above about 18%, and the high consistency alkali containing pulp is then treated with oxygen to effect delignification. The total amount of alkaline material applied to the pulp is between 0.8 and 7% by weight of oven dry pulp. High strength, low lignin pulps are subsequently formed which may be further bleached to high brightness with reduced amounts of chemicals.

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