Peroxide bleaching of pulp

D - Textiles – Paper – 21 – C

Patent

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D21C 9/16 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2224677

A process for peroxide bleaching of pulp using magnesium oxide as sole alkaline source wherein said pulp is bleached in the presence of hydrogen peroxide for a maximum period of 180 minutes and achievement of a target ISO brightness of 65 in regard to freshly prepared pulp characterised in that said magnesium oxide is utilised as MgO particles having a particle size of 5-500 microns and a particle surface area (PSA) of between 20-60 m2/g. By using such parameters, a peroxide bleaching process may be carried out most efficiently on a commercial scale.

Dans le procédé décrit de blanchiment aux peroxydes de pâte à papier, on utilise l'oxyde de magnésium comme seule source alcaline. La pâte à papier est blanchie en présence de peroxyde d'hydrogène pendant une durée maximale de 180 minutes et on atteint un degré de blanc selon les normes de l'ISO de 65 par comparaison avec la pâte à papier fraîche. Le procédé se caractérise en ce que l'oxyde de magnésium utilisé se présente sous forme de particules de MgO d'une taille de 5 à 500 microns et d'une superficie de 20 à 60 m?2¿/g. Avec ces paramètres, on peut efficacement mettre en oeuvre un procédé de blanchiment aux peroxydes à l'échelle industrielle.

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