Use of wash press for pulp alkali addition process

Details Use of wash press for pulp alkali addition process Use of wash press for pulp alkali addition process

D - Textiles, Paper

21

C

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

Patent

CA 2075875

USE OF WASH PRESS FOR PULP ALKALI ADDITION PROCESS ABSTRACT 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. Additional alkali may be applied onto the high consistency pulp prior to oxygen delignification to provide a total amount of between 0.8 and 7% by weight of oven dry pulp. The invention contemplates the use of one or more wash presses for reducing the overall amounts of alkaline material utilized in the process. High strength, low lignin pulps are subsequently formed which may be further bleached to high brightness with reduced amounts of chemicals by following the methods of the invention.

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