miun.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
High consistency hydrogen peroxide bleaching of a Norway spruce stone groundwood pulp: Influence of heat treatment and iron content
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (FSCN)
2011 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, no 2, p. 186-196Article in journal (Refereed) Published
Abstract [en]

The objective of this work was to improve the understanding on how thermal treatments of mechanical pulps containing iron influence the unbleached brightness and hydrogen peroxide bleachability at high brightness levels. An unbleached Norway spruce stone groundwood (SGW) pulp was subjected to heat and iron (Fe3+) treatments followed by a chelating stage and a high consistency hydrogen peroxide bleaching stage. The hydrogen peroxide bleachability was studied on pulps as a function of pre-treatment at elevated temperatures and strongly bound iron content prior to bleaching and the alkali charge during bleaching. The evaluation was done using an experimental design based on the MODDE software (Umetrics AB).

Heat treatment of the unbleached SGW pulp at 110 or 140 degrees C did not induce a significant increase in light absorption coefficient. Increasing the heat treatment temperature to 170 degrees C did, however, result in an increased light absorption coefficient corresponding to a brightness loss of 3.5% ISO. The light scattering coefficient was found to be essentially unchanged regardless of the heat-treatment conditions applied. The brightness loss resulting from the heat treatment could only partly be regained by hydrogen peroxide bleaching.

An increased amount of strongly bound iron in the unbleached SGW pulp increased the light absorption coefficient. This increase was slightly higher when heat pre-treatment was performed at 140 and 170 degrees C compared to when heating at 110 degrees C. Hydrogen peroxide bleaching was found to reduce the iron content of the pulps and thus regain some of the brightness that was lost. This effect was most pronounced at the higher alkali charge levels. It is thus important to minimise the processing temperature, the time at high temperature and the iron content of the pulp in order to improve the unbleached brightness and bleachability of mechanical pulps.

Place, publisher, year, edition, pages
2011. Vol. 26, no 2, p. 186-196
Keyword [en]
Mechanical pulps; Brightness; Light scattering; Light absorption; Bleaching; Hydrogen peroxide; Temperature; Iron
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-12987DOI: 10.3183/NPPRJ-2011-26-02-p186-196ISI: 000291334400003Scopus ID: 2-s2.0-79958727861OAI: oai:DiVA.org:miun-12987DiVA, id: diva2:387620
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

Open Access in DiVA

fulltext(552 kB)418 downloads
File information
File name FULLTEXT02.pdfFile size 552 kBChecksum SHA-512
85e2f4ec5bb5e2fb1aeeb4b7866dbba556f1476bfe52fa3a28d3ef95916643849765b7fe3b0a50e8367bbab735f9b6a0127ba8481c37f10a4c9e9d9e5273bda3
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Authority records BETA

Karlsson, Anette

Search in DiVA

By author/editor
Karlsson, Anette
By organisation
Department of Natural Sciences, Engineering and Mathematics
In the same journal
Nordic Pulp & Paper Research Journal
Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 418 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 299 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf