Article technique paru dans J-FOR* Vol.1, No1, 2011 (Disponible en anglais seulement)
RÉSUMÉ
It is well known that pH affects the effectiveness of chlorine dioxide treatment, but the standard recommendation has been to maintain a poststage pH range for brightening with chlorine dioxide between 3.5 and 4. In this paper, we confirm the optimum pH for final chlorine dioxide bleaching is dependent on chlorine dioxide charge, but that this stage should be operated with a final pH close to neutral when a typical chlorine dioxide charge is applied. We show that maintaining a pH close to neutral throughout the bleaching stage is the ideal strategy. This result can be achieved under unbuffered conditions in some instances, but is more consistently obtained by generating sodium bicarbonate in situ by adding carbon dioxide to alkaline pulp or sodium carbonate to acid pulp. In addition, we highlight the theory and practice of the nearneutral final chlorine dioxide brightening technology.
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AUTEURS :
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| ZHI-HUA JIANG FPInnovations, Pointe-Claire, Qc, Canada |
RICHARD BERRY FPInnovations, Pointe-Claire, Qc, Canada |
* Le prix I.H. Weldon est décerné au(x) membre(s) présentant la meilleure communication lors d'une réunion officielle de PAPTAC. Plus d'information disponible sur le site de PAPTAC.
* J-FOR - The Journal of Science & Technology for Forest Products and Processes, est une publication phare de PAPTAC, comprenant des articles évalués de haute qualité, traitant de technologie et de science relativement à des domaines traditionnels et émergents propres à l'industrie forestière.
