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The Impact of Wood Species on the Treatment of Brownstock with Hydrogen Peroxide


December 1, 2010
By Pulp & Paper Canada

Effets des essences de bois sur le traitement de la pte brune avec du peroxyde d’hydrogne

Effets des essences de bois sur le traitement de la pte brune avec du peroxyde d’hydrogne

Abstract: The Howe Sound mill uses an ODEopDD sequence to produce fully bleached kraft pulp from northern softwood. Tests of ClO2 consumption by the liquid portion of the 3.5% consistency stock feeding the Do stage were generally under 10% of total Do stage usage but did reach that level on occasion. Hydrogen peroxide (H2O2) was added to the bleach feed just minutes prior to ClO2 addition in the hopes of reducing overall bleaching cost. Key findings of the trial were that costs can indeed be reduced as long as there is only trace ClO2 residual in the filtrate used for dilution and peroxide dosage is kept low enough to ensure it is completely consumed before ClO2 is added.

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Paper presented at 94th PAPTAC Annual Meeting in Montreal, February 5-7, 2008

Full manuscript available at www.paptac.ca.


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