Two-stage chlorine bleaching process with filtrate...

D - Textiles – Paper – 21 – C

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

Patent

CA 2417338

A method of bleaching chemical pulp, comprising two bleaching stages (D0 and, respectively, D1) with chlorine dioxide as dominating bleaching chemical and at least one intermediate alkaline bleaching stage (E). The ingoing pulp is dewatered to a concentration of 25-40% before the first chlorine dioxide stage (D0) and to 10-40% after the second chlorine dioxide stage (D1). Filtrate from the dewatering after the second chlorine dioxide stage (D1) is re-cycled and utilized for controlling the pulp concentration to 8-15% of the dewatered pulp to the first chlorine dioxide stage (D0).

Cette invention concerne un procédé de blanchiment de la pâte à papier en deux étapes (D¿0? Et D¿1? respectivement) avec du dioxyde de chlore comme agent de blanchiment dominant assortie d'au moins une opération intermédiaire de blanchiment par extraction alcaline (E). A l'entrée, la pâte à papier est déshydratée jusqu'à obtention d'une concentration de 25-40 % avant la première opération de blanchiment au dixoxyde de chlore (D¿0?), puis à 10-40 % après la seconde opération de blanchiment au dioxyde de chlore (D¿1?). Le filtrat résultant de la déshydratation après la seconde opération de blanchiment à l'oxyde de chlore (D¿1?) est recyclé et utilisé pour doser la concentration de pâte à papier à 8-15 % de la pâte déshydratée après la première opération de blanchiment à l'oxyde de chlore (D¿0?).

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