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Nordic Pulp & Paper Research Journal

The international research journal on sustainable utilization of forest bioresources

Editor-in-Chief: Lindström, Tom

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Volume 27, Issue 1


Brightness development of a hydrogen peroxide bleached spruce TMP. Comparisons of pre-treatments with DTPA and a separable chelating surfactant

Ida Högberg / Dariusz Zasadowski / Anette Karlsson / Bengt Wikman / Fredrik Andersson / Erik Hedenström / Håkan Edlund / Magnus Norgren
  • Corresponding author
  • Mid Sweden University, FSCN, SE-851 70 Sundsvall, Sweden
  • ChemseQ International AB, Storgatan 90, SE-851 70 Sundsvall, Sweden
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Published Online: 2018-11-01 | DOI: https://doi.org/10.3183/npprj-2012-27-01-p050-055


In this investigation a new type of recoverable complexing agent (chelating surfactant) has been compared with a conventional complexing agent; diethylenetriamine pentaacetic acid (DTPA), in the metal ion sequestering of thermomechanical pulps (TMP) to be hydrogen peroxide bleached. After different degrees of washing of the pulps, bleaching experiments at different total alkali charges were performed with and without sodium silicate additions, and the ISO brightness of handmade sheets was measured. The residual hydrogen peroxide in the bleaching liquor was also determined. No significant difference in either the brightness development or the residual hydrogen peroxide content could be detected between the pulps treated with equivalent molar ratios of the different complexing agents. Furthermore, the recovery of the chelating surfactant-manganese complexes from laboratory made white water by froth flotation was also studied. Two different foaming agents; sodium dodecyl sulphonate (SDS) and dimethyldodecylamine oxide (DDAO), were tested in the froth generation. After an addition of 160 ppm of DDAO, more than 80% of the manganese chelates could be recovered in the foam, containing 3% of the initial water mass.

Keywords: Thermomechanical pulp; Hydrogen peroxide bleaching; Manganese; DTPA; Chelating surfactant; Flotation

About the article

Received: 2011-06-20

Accepted: 2011-10-12

Published Online: 2018-11-01

Published in Print: 2012-01-01

Citation Information: Nordic Pulp & Paper Research Journal, Volume 27, Issue 1, Pages 50–55, ISSN (Online) 2000-0669, ISSN (Print) 0283-2631, DOI: https://doi.org/10.3183/npprj-2012-27-01-p050-055.

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