Xylanase treatment of chemical pulp

Details Xylanase treatment of chemical pulp Xylanase treatment of chemical pulp

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 9/14 (2006.01)

Patent

CA 2477847

The present invention discloses methods of bleaching chemical pulp that use xylanase enzymes after chemical bleaching. The method comprises the steps of carrying out a chlorine dioxide stage to produce a partially bleached pulp, treating the partially bleached pulp with a xylanase enzyme, optionally in the presence of oxygen and hydrogen peroxide, in a mild extraction stage, then bleaching the pulp with a second chlorine dioxide stage. The method allows the mill to decrease the usage of sodium hydroxide or other alkali, while decreasing the use of chlorine dioxide, and possibly improving the yield and strength of the pulp, while maintaining a similar level of bleached brightness of the pulp. The pulp bleaching method of the present invention may be performed in a pulp mill as part of a complex pulp bleaching process.

L'invention porte sur un procédé de blanchiment de la pâte chimique utilisant des enzymes, les xylanases, après le blanchiment chimique. Ledit procédé comporte les étapes suivantes: blanchiment partiel de la pâte au bioxyde de chlore; traitement de la pâte partiellement blanchie par les xylanases, facultativement en présence d'oxygène de peroxyde d'hydrogène dans une étape d'extraction douce; nouvelle étape de blanchiment de la pâte au bioxyde de chlore. Ce procédé permet de réduire l'utilisation de soude et autres alcalis et celle du bioxyde de chlore, avec la possibilité d'améliorer le rendement et la tenue de la pâte, tout en conservant un niveau similaire de brillant de la pâte blanchie. Ledit procédé peut se dérouler dans une usine de pâte en tant que partie d'un processus complexe de blanchiment.

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