Bleaching of pulp

Details Bleaching of pulp Bleaching of pulp

D - Textiles, Paper

21

C

D21C 9/14 (2006.01)

Patent

CA 2665969

The present invention relates to a process of bleaching pulp derived from an alkaline pulping process having a hexenuronic acid content prior to the final bleaching stage from about 1 to about 80 mmol/kg dry pulp, said process comprising three chlorine 5 dioxide stages D0, D1, and D2, wherein the chlorine dioxide charges based on the total chlorine dioxide charge in a) D0 is from about 40 to about 60 %; b) D1 is from about 30 to about 55 %; c) D2 is from about 4 to about 20 %, and wherein the final chlorine dioxide stage D2 is 10 performed at a pH from about 2 to about 4.5. The invention also relates to a bleached pulp obtainable by the process.

La présente invention concerne un procédé de blanchiment de la pâte à papier issue d'un procédé de fabrication de pâte en milieu alcalin, ayant une teneur en acide hexenuronique avant le stade de blanchiment final d'environ 1 à environ 80 mmol/kg de pâte sèche. Ledit procédé comprend trois stades au dioxyde de chlore D0, D1 et D2. Les charges de dioxyde de chlore sur la base de la charge totale de dioxyde de chlore sont dans a) D0 d'environ 40 à environ 60 % ; b) D1 d'environ 30 à environ 55 % ; c) D2 d'environ 4 à environ 20 %, et le stade final au dioxyde de chlore D2 est effectué à un pH d'environ 2 à environ 4,5. L'invention concerne également une pâte à papier blanchie pouvant être obtenue par le procédé.

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