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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. / Berry, Richard / Burgert, Ingo / Evans, Robert / Evtuguin, Dmitry V. / Frazier, Charles E. / Fukushima, Kazuhiko / Gellerstedt, Göran / Gindl-Altmutter, Wolfgang / Glasser, W. G. / Heitner, Cyril / Holmbom, Bjarne / Isogai, Akira / Kadla, John F. / Kleen, Marjatta / Koch, Gerald / Lachenal, Dominique / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Pizzi, Antonio / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Sipilä, Jussi / Tamminen, Tarja / Viikari, Liisa / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi

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Impact per Publication (IPP) 2015: 1.427

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Alkaline peroxide treatment of ECF bleached softwood kraft pulps. Part 1. Characterizing the effect of alkaline peroxide treatment on carboxyl groups of fibers

Zheng Dang1 / Thomas Elder2 / Arthur J. Ragauskas3

1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA

2USDA Forest Service, Southern Research Station, Pineville, LA, USA

3School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, USA

Corresponding author. School of Chemistry and Biochemistry, Georgia Institute of Technology, 500 10th Street, N.W., Atlanta, GA 30332-0620, USA Phone: +1-404-8949701, Fax: +1-404-8944778

Citation Information: Holzforschung. Volume 61, Issue 4, Pages 445–450, ISSN (Online) 1437434X, ISSN (Print) 00183830, DOI: 10.1515/HF.2007.067, June 2007

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The influence of alkaline peroxide treatment has been characterized on elementally chlorine-free (ECF) bleached softwood (SW) kraft pulp. The results indicate that fiber charge increased with an increase in peroxide charge: a maximum fiber charge increment of 16.6% was obtained with 8.0% more peroxide charge on oven-dried (o.d.) pulp at 60.0°C. Two primary bleaching temperatures of 60.0°C and 90.0°C were investigated during peroxide treatment. Copper number decreased for peroxide charges of 0.5% and 1.0% at 60.0°C and 90.0°C, respectively, then increased with increasing peroxide charge. Both fiber charge and copper number approached constant values when 4.0% or higher peroxide charge was applied. Peroxide treatment on a bleached kraft pulp at 90.0°C resulted in lower fiber charge and lower intrinsic viscosity compared to treatment at 60.0°C. Sodium borohydride (NaBH4) pretreatment was able to protect the fibers from being degraded during peroxide bleaching. Fiber charge and copper number were compared after peroxide treatment of ECF bleached kraft pulp to NaBH4-reduced ECF bleached kraft pulp. The results indicate that the carbonyl group content of fibers is favorable for improving fiber charge after peroxide treatment.

Keywords: carbonyl; carboxyl; copper number; fiber charge; peroxide; sodium borohydride; tensile strength; viscosity

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