D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/08 (2006.01) D21C 9/16 (2006.01)
Patent
CA 2553662
The invention relates to a method for reducing the content of extractives of a high-yield pulp in a peroxide bleaching stage, said stage including peroxide bleaching and a subsequent dewatering or washing, said method comprising contacting the pulp in the peroxide bleaching with an organic stabilizer and in or after the peroxide bleaching with a surfactant, and thereafter subjecting the bleached pulp to said dewatering or washing for removing extractives along with the aqueous phase. The invention also relates to a method for producing bleached high-yield pulp.
L'invention porte sur un procédé de réduction de la teneur en produits d'extraction de pâtes à haut rendement pendant l'étape de blanchiment au peroxyde qui comprend le blanchiment au peroxyde puis l'épaississement puis le lavage, ledit procédé consistant à mettre pendant le blanchiment la pâte en contact avec un stabilisant organique et, pendant ou après, avec un tensio-actif, puis à épaissir ou laver la pâte blanchie de manière à éliminer les produits d'extraction avec la phase aqueuse. L'invention porte également sur un procédé de production de pâte à haut rendement.
Jakara Jukka
Paren Aarto
Gowling Lafleur Henderson Llp
Kemira Oyj
LandOfFree
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