Accueil Sciences et Innovations Sciences Near-neutral final chlorine dioxide brightening theroy and practice

Near-neutral final chlorine dioxide brightening theroy and practice

Envoyer Imprimer PDF

ART2-prix

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.

Accès à l'article complet dans un format pdf

 

AUTEURS :

ART2-auteur1 ART2-auteur2
 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.

J-FOR-1

 
paptac-portal

inscription-infolettre

acces-infolettres
le maitre papetier
buckman banner
paper & beyond
fpinnovations banner
cristini banner
le maitre papetier