Bleaching process of chemical pulp

Details Bleaching process of chemical pulp Bleaching process of chemical pulp

D - Textiles, Paper

21

C

D21C 9/14 (2006.01)

Patent

CA 2647781

A process for the bleaching of chemical pulp, comprising a first chlorine dioxide treatment (D) of the initial bleaching and chelation (Q) to be carried out in connection therewith, forming together a DQ treatment. The process is characterized in that the chelation is carried out at the pH of from 2 to 7, and it is followed by an alkalizing stage (N) of the pulp, without intermediate washing for raising the pH of the pulp to above 7 and at most to 12 prior to a following stage which is a washing step.

L'invention concerne un procédé destiné au blanchiment de la pâte chimique, comprenant un premier traitement au dioxyde de chlore (D) initial et une chélation (Q) qui sont réalisés ensemble, formant un traitement DQ. Ce procédé se caractérise par le fait que la chélation est réalisée à un pH compris entre 2 et 7 et suivie d'une étape d'alcalisation (N) de la pâte, sans lavage intermédiaire pour augmenter le pH de la pâte jusqu'à une valeur comprise entre 7 et 12 avant une étape suivante qui est une étape de lavage.

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