Oxygen bleaching of cellulosic pulps

Details Oxygen bleaching of cellulosic pulps Oxygen bleaching of cellulosic pulps

D - Textiles, Paper

21

C

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

Patent

CA 2188568

An improved oxygen bleaching process wherein the pulp is bleached in an aqueous organic medium wherein a polyhydric alcohol constitutes between 10 and 70% by weight of the medium to produce a pulp having a viscosity at least 2.5 x 103 Pa.s (2.5 cp) higher than a similar pulp bleached using the same conditions in an aqueous atmosphere to the same kappa no. of 8 ml.

Dans un procédé amélioré de blanchiment à l'oxygène, la pâte est blanchie dans un milieu organique aqueux qui contient un polyalcool constituant 10 à 70 % en poids du milieu afin de conférer à la pâte une viscosité supérieure d'au moins 2,5 cp à celle d'une pâte similaire blanchie dans les mêmes conditions et dans un milieu aqueux, atteignant le même indice kappa de 8 ml.

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