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High consistency hydrogen peroxide bleaching of mechanical pulps with varying amounts of fines
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
2010 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 25, no 3, p. 256-268Article in journal (Refereed) Published
Abstract [en]

Hydrogen peroxide is a widely used bleaching chemical for mechanical pulps and is particularly useful when high brightness levels are required. The objective of this work was to study fines as a limiting factor for reaching higher brightness levels in high consistency hydrogen peroxide bleaching of Norway spruce (Picea abies) thermomechanical (TMP) and stone groundwood (SGW) pulps. The hydrogen peroxide bleaching efficiency (i.e. light absorption coefficient reduction) was studied as a function of temperature, alkali charge and fines content using an experimental design based on MODDE software (Umetrics AB).It is known that all types of fines contain more lignin, hemicelluloses, pectins, metals and less cellulose than long fibres. The light absorption coefficient was greater for unbleached TMP than for unbleached SGW pulp and an increased quantity of fines increased the light absorption coefficient for both pulp types. The increase was, however, most pronounced for the TMP. Furthermore, the data suggests that both the fibre fraction and the fines fraction are more coloured in the thermomechanical pulp. In most cases, increased amounts of fines in the pulp had a negative impact on the bleached pulp brightness in spite of the improved light scattering ability accompanying the addition of fines. A level of fines exceeding 50% was especially detrimental resulting in lower pulp brightness due to a higher light absorption coefficient.Increasing the bleaching temperature did not improve the bleaching efficiency. The optimal bleaching temperature at a hydrogen peroxide charge of 4.5% was found to be 70°C within the tested interval of 70-110°C. For a fines content of 25%, the stone groundwood pulp displayed a brightness of 83% whereas the thermomechanical pulp achieved a brightness of 79%.

Place, publisher, year, edition, pages
2010. Vol. 25, no 3, p. 256-268
Keyword [en]
Mechanical pulps, Brightness, Light scattering, Light absorption, Fines, Bleaching, Hydrogen peroxide, Temperature
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-12986DOI: 10.3183/NPPRJ-2010-25-03-p256-268ISI: 000285568100001Scopus ID: 2-s2.0-79955740926OAI: oai:DiVA.org:miun-12986DiVA, id: diva2:387615
Available from: 2011-01-14 Created: 2011-01-14 Last updated: 2017-12-11Bibliographically approved
In thesis
1. High consistency hydrogen peroxide bleaching of Norway spruce mechanical pulps
Open this publication in new window or tab >>High consistency hydrogen peroxide bleaching of Norway spruce mechanical pulps
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2010
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 49
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-12984 (URN)978-91-86694-07-4 (ISBN)
Supervisors
Available from: 2011-01-14 Created: 2011-01-14 Last updated: 2011-01-14Bibliographically approved
2. Improved hydrogene peroxide bleaching of mechanical pulps through fundamental understanding of the influence of heat, iron, fines and chemical treatment on chromophore content
Open this publication in new window or tab >>Improved hydrogene peroxide bleaching of mechanical pulps through fundamental understanding of the influence of heat, iron, fines and chemical treatment on chromophore content
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2013. p. 76
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 170
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-20982 (URN)978-91-87557-16-3 (ISBN)
Supervisors
Available from: 2014-01-08 Created: 2014-01-08 Last updated: 2014-01-08Bibliographically approved

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Karlsson et al: High consistency hydrogen peroxide beeaching of mechanical pulps with varying amounts of fines. JNPPR 2010 vol 25 3 pp 256-268(424 kB)800 downloads
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