Brightness Optimization of Ozone Pre-Treatment Followed by Peroxide Bleaching of TMP Pulp from Tamarack (Larix laricina) |
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| Authors: | Sylvain Robert Jean-Patrice Lamothe Claude Daneault |
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| Affiliation: | Centre de Recherche en P[acaron]tes et Papiers , Université du Québec à Trois-Rivières , P.O. Box 500, Trois-Rivières, Québec, Canada , G9A 5H7 |
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| Abstract: | This study examines the influence of ozone on a TMP pulp of tamarack in an independent bleaching stage and as a pre-treatment for hydrogen peroxide bleaching. Ozone charges of up to 6% were used on dry pulp. The results were compared to those obtained with 1% H2O2 bleaching. Experiments were conducted at 23°C and 55°C, and pH varied from 3.5 to 10.5. The best bleaching results were reached with acidic pH, with interesting behavior observed at an alkaline pH level. Ozone effectively attacks CO groups in lignin, but lacks the chemical selectivity and high reactivity required to become a good bleaching agent. |
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