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Wood Research and Technology

Holzforschung

Cellulose – Hemicelluloses – Lignin – Wood Extractives

Editor-in-Chief: Salmén, Lennart

Editorial Board: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / 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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Volume 71, Issue 7-8

Issues

Brightness stability of eucalyptus-dissolving pulps: effect of the bleaching sequence

Jordan Perrin
  • Corresponding author
  • Grenoble INP-Pagora, The International School of Paper, Print Media and Biomaterials, 461 rue de la Papeterie, CS 10065, 38402 Saint Martin d’Hères Cedex, Grenoble, France
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Dominique Lachenal
  • Grenoble INP-Pagora, The International School of Paper, Print Media and Biomaterials, 461 rue de la Papeterie, CS 10065, 38402 Saint Martin d’Hères Cedex, Grenoble, France
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Christine Chirat
  • Grenoble INP-Pagora, The International School of Paper, Print Media and Biomaterials, 461 rue de la Papeterie, CS 10065, 38402 Saint Martin d’Hères Cedex, Grenoble, France
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-04-26 | DOI: https://doi.org/10.1515/hf-2016-0208

Abstract

The factors governing the brightness reversion (BR) of dissolving pulps under heat exposure are investigated. Carbonyl (CO) groups were artificially introduced on fully bleached pulp by sodium hypochlorite (NaClO) oxidation. It was demonstrated that the CO groups are responsible for loss of brightness stability (BS). These groups were partly eliminated by an alkaline extraction stage (E), which improved BS. However, an alkaline peroxide stage (P) was more efficient than E to improve BS, but without any additional CO loss. Moreover, an unbleached dissolving pulp was bleached in the laboratory by elemental chlorine free (ECF) and totally chlorine free (TCF) [ozone-based] sequences to the same brightness. The very low CO content was about the same in both cases. The ECF-bleached pulp showed substantially lower BS than the TCF pulp. These results are interpreted such that the chemistry of chromophores in the unbleached pulp also governs BS. In situ detection of phenolic and quinone chromophores in bleached dissolving pulp was performed by electron paramagnetic resonance (EPR) spectroscopy and ultraviolet resonance Raman (UVRR) spectroscopy. The content of these groups was bleaching-sequence-dependent, which may be related to the BS differences.

Keywords: brightness reversion; carbonyl groups; dissolving pulp; ECF and TCF bleaching; EPR spectroscopy; phenolic OH groups; quinone chromophores; UV resonance Raman spectroscopy

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About the article

Received: 2016-11-04

Accepted: 2017-03-15

Published Online: 2017-04-26

Published in Print: 2017-07-26


Citation Information: Holzforschung, Volume 71, Issue 7-8, Pages 625–631, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf-2016-0208.

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