Process for production of bleached pulp

Details Process for production of bleached pulp Process for production of bleached pulp

D - Textiles, Paper

21

C

D21C 9/16 (2006.01)

Patent

CA 2709526

Provided is a process for producing bleached pulp, including subjecting unbleached pulp, which is obtained by cooking a lignocellulose substance, to alkali-oxygen bleaching treatment and then subjecting the alkali-oxygen bleached pulp to chlorine-free bleaching treatment including chlorine dioxide treatment, wherein in at least one chlorine dioxide treatment stage in which the chlorine dioxide treatment is performed, monopersulfuric acid is used in combination. The amount of chlorine dioxide to be used is reduced and the colour reversion resistance of the bleached pulp is improved by this process.

L'invention porte sur un procédé pour la production de pâte blanchie, qui comprend le fait de soumettre une pâte non blanchie, obtenue par digestion d'un matériau ligno-cellulosique, à un blanchiment à l'oxygène-alcali puis à un blanchiment sans chlore élémentaire comprenant un traitement au dioxyde de chlore, de l'acide péroxomonosulfurique étant simultanément utilisé dans au moins l'une des étapes du traitement au dioxyde de chlore afin de réduire la quantité de dioxyde de chlore utilisée et d'améliorer la résistance à la décoloration de la pâte blanchie.

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