Bleaching process of chemical pulp

D - Textiles – Paper – 21 – C

Patent

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D21C 9/14 (2006.01)

Patent

CA 2647475

A process for the bleaching of chemical pulp, wherein the initial bleaching of the pulp comprises a first chlorine dioxide treatment (D0) and a following alkaline treatment with oxygen and hydrogen peroxide (EOP), which stages are separated from each other with a washing stage, and a treatment of the pulp to reduce the content of transition metals of the pulp prior to said peroxide treatment. The process is characterized in that alkali is added to the pulp after addition of chlorine dioxide in the D0 stage to adjust the pH of the pulp to neutral or basic (N stage) prior to the washing stage following the chlorine dioxide stage, whereby the initial bleaching comprises the sequence D0N EOP.

L'invention concerne un procédé destiné au blanchiment de la pâte chimique, dans lequel le blanchiment initial de la pâte comprend un premier traitement au dioxyde de chlore (D0) suivi d'un traitement alcalin à l'oxygène et au peroxyde d'hydrogène (EOP), ces étapes étant séparées les unes des autres par une étape de lavage, et un traitement de la pâte afin de réduire la teneur en métaux de transition de la pâte avant ledit traitement au peroxyde. Le procédé se caractérise par le fait qu'une substance alcaline est ajoutée à la pâte après addition de dioxyde de chlore dans l'étape D0 afin d'ajuster le pH de la pâte afin qu'il soit neutre ou basique (étape N) avant l'étape de lavage suivant l'étape de traitement au dioxyde de chlore, le blanchiment initial comprenant la séquence D0NEOP.

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