D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/10 (2006.01) D21C 9/147 (2006.01) D21C 9/153 (2006.01) D21C 9/16 (2006.01)
Patent
CA 2132056
ABSTRACT The present invention relates to a method of bleaching pulp to a brightness of at least ISO 80 by utilizing at least two of the following bleaching agents: oxygen, ozone, peroxide. The invention is characterized of cooking the pulp, treating the pulp with at least one of the following agents or manners: acidifying, EDTA and DTPA, for removing heavy metals, delignifying pulp in a pressurized, two-step oxygen stage, and bleaching the pulp with at least one of the following agents: O2, O3, ClO2, H2O2.
L'invention concerne une méthode de blanchiment de la pâte jusqu'à un degré de blanc d'au moins ISO 80 par au moins deux des agents de blanchiment suivants : oxygène, ozone, peroxyde. L'invention est caractérisée par la cuisson de la pâte, son traitement avec au moins un des agents ou processus suivants : acidification, ajout d'agents de chélation EDTA et DTPA, pour l'élimination des métaux lourds, sa délignification au cours d'un processus en deux étapes sous oxygène comprimé et son blanchiment avec au moins l'un des agents suivants : O2, O3, ClO2 et H2O2.
Nummenaho Matti
Pikka Olavi
Ronkonharju Hannu
Ahlstrom Machinery Oy
Gowling Lafleur Henderson Llp
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