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Improved hydrogen peroxide bleaching of mechanical pulps using carbon dioxide in combination with sodium and magnesium based alkali sources
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (FSCN)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (FSCN)
Chalmers Industriteknik, SE-41288 Gothenburg, Sweden.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (FSCN)
2011 (English)In: 16th International Symposium on Wood, Fiber and Pulping Chemistry - Proceedings, ISWFPC, 2011, Vol. 1, 741-745 p.Conference paper, Published paper (Refereed)
Abstract [en]

The pH-profile in the hydrogen peroxide bleaching stage of a Norway spruce thermomechanical pulp was levelled out by using carbon dioxide in combination with sodium or magnesium based alkali sources. Addition of carbon dioxide when magnesium hydroxide was used as the alkali source increased the pulp brightness with up to 1.5 brightness units when the bleaching was performed at 70 °C. When the temperature was increased from 70°C to 90 °C the brightness was increased with about two brightness units, addition of carbon dioxide increased it further. The residual hydrogen peroxide and the chemical oxygen demand (COD) levels were not affected as a consequence of the carbon dioxide addition. In the experiments where sodium hydroxide was used as the alkali source, addition of carbon dioxide lowered the pH that resulted in a decreased COD level, a slightly lower brightness level and, to some extent, an increased residual hydrogen peroxide level.

Place, publisher, year, edition, pages
2011. Vol. 1, 741-745 p.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-16751Scopus ID: 2-s2.0-84855709320OAI: oai:DiVA.org:miun-16751DiVA: diva2:545183
Conference
16th International Symposium on Wood, Fiber and Pulping Chemistry, ISWFPC;Tianjin;8 June 2011through10 June 2011;Code88003
Available from: 2012-08-17 Created: 2012-08-17 Last updated: 2012-08-17Bibliographically approved

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Logenius, LouiseEngstrand, PerPaulsson, Magnus
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CiteExportLink to record
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