Home Sciences & Innovations Sciences Near-neutral final chlorine dioxide brightening theroy and practice

Near-neutral final chlorine dioxide brightening theroy and practice


Technical Paper published in J-FOR* Vol.1, No1, 2011 


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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ART2-author1 ART2-author2
Pointe-Claire, Qc, Canada
Pointe-Claire, Qc, Canada

* The I.H Weldon Award recognizes the best paper presented by a member or members at any meeting taking place from six months before to six months after the previous Annual Meeting. More details on PAPTAC's website.

* J-FOR - The Journal of Science & Technology for Forest Products and Processes, is a PAPTAC's flagship publication, incorporating high-quality peer-reviewed papers dealing with the technology and science of traditional and emerging areas that are pertinent to the forest industry.


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