Improved bleaching of high consistency lignocellulosic pulp

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/10 (2006.01) D21C 9/00 (2006.01) D21C 9/153 (2006.01)

Patent

CA 2194962

The present invention pertains to a method having increased selectivity for bleaching lignocellulosic pulp having a high consistency from a first GE brightness to a second, higher GE brightness which comprises the steps of (a) fluffing the high consistency pulp having the first GE brightness to a specific surface area of at least about 90 m2/kg; and (b) contacting the fluffed pulp with a gaseous bleaching agent to form a bleached pulp having the second, higher GE brightness, wherein the pulp fluffing in step (a) and the pulp bleaching in step (b) are carried out substantially simultaneously. The present invention also pertains to a bleached lignocellulosic pulp prepared by the method of the present invention.

La présente invention concerne un procédé plus sélectif de blanchiment d'une pâte lignocellulosique très concentrée pour l'amener d'un premier degré de blanc GE à un second degré de blanc GE plus élevé. Ce procédé consiste (a) à désagréger la pâte très concentrée ayant le premier degré de blanc GE pour avoir une surface spécifique d'au moins 90 m?2¿/kg environ; et (b) à mettre en contact la pâte désagrégée avec un agent de blanchiment gazeux pour former une pâte blanchie ayant un second degré de blanc GE plus élevé. Dans ce procédé, la désagrégation de la pâte de l'étape (a) et le blanchiment de la pâte de l'étape (b) se font sensiblement en même temps. La présente invention concerne également une pâte lignocellulosique blanchie préparée par le procédé de la présente invention.

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