Batch process for preparing pulp

Details Batch process for preparing pulp Batch process for preparing pulp

D - Textiles, Paper

21

C

D21C 1/06 (2006.01) D21C 3/02 (2006.01) D21C 3/22 (2006.01)

Patent

CA 2530704

According to the invention, polysulfide is used in the manufacture of kraft pulp in the initial stage of a displacement batch process in order to improve the yield. Polysulfide-containing white liquor is added intermixed with the first liquor charged to the digester, or as a separate charge before the impregnation liquor is introduced. Preferably, a cooking catalyst, e.g. antraquinone, is added to the white liquor charge as the cooking stage commences.

Selon l'invention, on utilise un polysulfure dans la fabrication d'une pâte kraft dans l'étape initiale d'un procédé discontinu de déplacement en vue d'une amélioration du rendement. Une lessive blanche contenant du polysulfure est ajoutée par mélange à la première lessive chargée dans le digesteur, ou sous la forme d'une charge séparée avant l'introduction de la lessive d'imprégnation. De préférence, un catalyseur de cuisson, tel qu'une anthraquinone, est ajouté à la charge de lessive blanche au début de l'étape de cuisson.

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