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Holzforschung

International Journal of the Biology, Chemistry, Physics, and Technology of Wood

Editor-in-Chief: Faix, Oskar

Editorial Board Member: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / Salmen, Lennart / Sixta, Herbert / Vuorinen, Tapani / Argyropoulos, Dimitris S. / Balakshin, Yu / Barnett, J. R. / Burgert, Ingo / Rio, Jose C. / Evans, Robert / Evtuguin, Dmitry V. / Frazier, Charles E. / Fukushima, Kazuhiko / Gindl-Altmutter, Wolfgang / Glasser, W. G. / Holmbom, Bjarne / Isogai, Akira / Kadla, John F. / Koch, Gerald / Lachenal, Dominique / Laine, Christiane / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Potthast, Antje / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Sipilä, Jussi / Takano, Toshiyuki / Tamminen, Tarja / Theliander, Hans / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi

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Online
ISSN
1437-434X
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In This Section
Volume 65, Issue 3 (May 2011)

Issues

Brightness reversion of eucalyptus kraft pulp: Effect of carbonyl groups generated by hypochlorous acid oxidation

Zhen Zhou
  • Aalto University, Department of Forest Products Technology, Espoo, Finland
  • Email:
/ Anna-Stiina Jääskeläinen
  • Aalto University, Department of Forest Products Technology, Espoo, Finland
/ Immanuel Adorjan
  • Aalto University, Department of Forest Products Technology, Espoo, Finland
  • University of Natural Resources and Applied Sciences Vienna (BOKU), Vienna, Austria
/ Antje Potthast
  • University of Natural Resources and Applied Sciences Vienna (BOKU), Vienna, Austria
/ Paul Kosma
  • University of Natural Resources and Applied Sciences Vienna (BOKU), Vienna, Austria
/ Tapani Vuorinen
  • Aalto University, Department of Forest Products Technology, Espoo, Finland
Published Online: 2011-02-09 | DOI: https://doi.org/10.1515/hf.2011.047

Abstract

The impact of hypochlorous acid (HOCl) treatment on a fully bleached eucalyptus kraft pulp was studied with respect to the final brightness as well as the brightness reversion under humid ageing conditions. The carbonyl contents in the pulps were determined by the CCOA method where carbazole-9-carboxylic acid [2-(2-aminooxethoxy)-ethoxy] amide (CCOA) was applied as the carbonyl-selective fluorescence label. The molecular weight distribution of cellulose and hemicelluloses was analyzed as well. The amount of carbonyl groups in pulp was observed to increase significantly after the HOCl treatment, and the carbonyl distribution in pulp to shift towards the low molecular weight fraction. Plotting the carbonyl content against the post color number (PCN) of the pulps revealed a linear correlation. Additionally, the effect of the hemicellulose content was investigated, and alkaline extraction was applied to partially remove the hemicelluloses in pulp. These hemicellulose-poor samples showed a lower reactivity with hypochlorous acid and less brightness reversion at equal carbonyl content.

Keywords: bleached kraft pulp; brightness reversion; carbonyl content; ClO2 bleaching; hypochlorous acid oxidation

About the article

Corresponding author. Department of Forest Products Technology, Aalto University, P.O. Box 16300, 00076, Espoo, Finland


Received: 2010-06-29

Accepted: 2010-12-28

Published Online: 2011-02-09

Published Online: 2011-02-09

Published in Print: 2011-05-01



Citation Information: Holzforschung, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf.2011.047. Export Citation

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