Methods for carbonate pretreatment and pulping of cellulosic...

D - Textiles – Paper – 21 – C

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D21C 1/08 (2006.01) D21C 3/00 (2006.01) D21C 9/147 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2651483

A method of pretreating comminuted fibrous material with sodium carbonate and then cooking the pretreated material in the presence of anthraquinone (AQ) is provided. The resulting pulp produced has a higher yield, enhanced strength, and better bleachability compared to pulp produced by prior art methods. AQ may also be introduced to the carbonate pretreatment stage. The method may further include an acid pretreatment providing further enhanced properties to the pulp produced.

L'invention porte sur un procédé qui permet d'effectuer un prétraitement d'une matière fibreuse broyée avec du carbonate de sodium et de cuire ensuite la matière prétraitée en présence d'anthraquinone (AQ). On obtient alors une pâte possédant un rendement plus élevé, une résistance améliorée et une meilleure aptitude au blanchiment, en comparaison avec les pâtes produites selon les procédés de l'état antérieur de la technique. On peut également introduire l'anthraquinone à l'étape du prétraitement au carbonate. Le procédé de l'invention peut également comprendre un prétraitement à l'acide qui permet d'encore améliorer les propriétés de la pâte produite.

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