D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/14 (2006.01) D21H 21/30 (2006.01) D21H 21/32 (2006.01)
Patent
CA 2643093
Final chlorine dioxide bleaching of lignocellulosic materials is most effective at a near-neutral pH but present industrial practice typically targets a final pH of between 3.5 and 4.0 because of the difficulty in achieving and maintaining near-neutral pH cost effectively. The in situ formation of bicarbonate before the addition of chlorine dioxide provides a way of maintaining the required near-neutral pH. Near-neutral final chlorine dioxide bleaching also produces a bleached pulp that is in a state that responds more effectively to fluorescent whitening or optical brightening agents.
La décoloration par dioxyde de chlore final de matériaux lignocellulosiques est plus efficace à un pH presque neutre mais la pratique industrielle actuelle cible un pH final compris entre 3,5 et 4,0 compte tenu de la difficulté à atteindre et maintenir un pH presque neutre de manière rentable. La formation in situ de bicarbonate avant l'addition de dioxyde de chlore constitue un moyen permettant de maintenir le pH presque neutre requis. La décoloration par dioxyde de chlore final presque neutre produit également une pulpe décolorée réagissant de manière plus efficace aux agents d'éclaircissement optiques ou aux agents de blanchissement fluorescents.
Berry Richard Mckinnon
Jiang Zhi-Hua
Fpinnovations
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
LandOfFree
Near-neutral chlorine dioxide bleaching of pulp does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Near-neutral chlorine dioxide bleaching of pulp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near-neutral chlorine dioxide bleaching of pulp will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-2019862