Method for complex treatment of pulp in conjunction with a...

D - Textiles – Paper – 21 – C

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D21C 9/16 (2006.01) D21C 9/10 (2006.01) D21C 9/14 (2006.01)

Patent

CA 2185808

The present invention relates to a method for the manufacture of bleached cellulose pulp, in conjunction with which lignocellulose material is digested to form cellulose pulp by means of an alkaline digestion liquor, and the cellulose pulp in the form of a suspension is screened, if necessary, and subjected in series to at least oxygen gas delignification/bleaching (O), if required, chlorine dioxide bleaching (D) and bleaching with non chlorine-containing, oxidative bleaching agent (O, P, Z), with the various bleaching stages interspersed with washing and/or reconcentration of the cellulose pulp in at least one stage, characterized in that complexing agents are added to the cellulose pulp in conjunction with the chlorine dioxide bleaching. It is also important for the mol quotient of the cellulose pulp for magnesium/manganese, during bleaching with a non chlorine-containing, oxidative bleaching agent, to be maintained at or brought to a value exceeding 20, and preferably exceeding 40.

L'invention concerne un procédé de fabrication de pâte de cellulose blanchie combiné à une digestion du matériau lignocellulosique, de manière à obtenir de la pâte de cellulose au moyen d'une liqueur de digestion alcaline. On tamise la pâte de cellulose sous forme de suspension, si nécessaire et on la soumet en série à au moins un processus de délignification/blanchiment à l'oxygène (O), si nécessaire, à un blanchiment au dioxyde de chlore (A) et à un blanchiment au moyen d'un agent de blanchiment oxydant et non chloré (O, P, Z), les différentes étapes de blanchiment s'entrecalant avec un lavage et/ou une reconcentration de la pâte de cellulose en au moins une étape caractérisée par le fait qu'on ajoute des agents complexants à la pâte de cellulose en combinaison avec le blanchiment au dioxyde de chlore. Il est également important de maintenir le quotient molaire de magnésium/manganèse dans la pâte de cellulose, pendant le blanchiment avec un agent oxydant non chloré, à une valeur supérieure à 20 et, de préférence, supérieure à 40 ou de l'amener au niveau de ladite valeur.

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