Abstract
The reactions between chlorine dioxide and the residual lignin in oxygen-bleached softwood kraft pulps have been studied. In a first series, isolated lignin samples have been subjected to chlorine dioxide oxidation at different pH values and subsequently analysed by oxidative degradation and elemental analysis. Different analytical techniques have also been employed to follow the gradual chemical changes in lignins isolated from kraft pulps after each of the bleaching stages in the OD(EOP)DD sequence.
The results demonstrate that, in order to minimize chlorination of the lignin, the first chlorine dioxide stage should be carried out at a pH around or above three. At this pH level, a high degree of lignin oxidation is also achieved. A certain (mono)-chlorination of the lignin in the first D stage cannot be avoided, but this chlorine is to a large extent removed in the later bleaching stages. The efficient and non-selective oxidation of the various phenolic lignin end groups by chlorine dioxide is clearly illustrated by the analytical data. Moreover,13C NMR reveals that reduced lignin structures formed during the kraft cook survive the oxidative bleaching stages to a large extent.
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References
D.W. Reeve,Tappi J.,74, 123 (1991).
G. Gellerstedt, E.-L. Lindfors, and J. Pranda,J. Wood Chem. Technol.,14, 467 (1994).
G. Gellerstedt, Permanganate Oxidation. In:Methods in Lignin Chemistry, S.Y. Lin and C.W. Dence (Eds.), pp. 322–333, Springer-Verlag, Berlin, Heidelberg (1992).
D. Robert, G. Gellerstedt, and M. Bardet,Nordic Pulp Pap. Res. J.,1, 18 (1986).
G. Gellerstedt,The Chemical Structure of Pulp Components in Pulp Bleaching. Principles & Practice, C. Dence and D. Reeve (Eds.), TAPPI PRESS, in press.
G. Gellerstedt, and E.-L. Lindfors,Tappi J.,70, 119 (1987).
R.C. Francis, Y.-Z. Lai, C.W. Dence, and T.C. Alexander,Tappi J.,74, 219 (1991).
G. Gellerstedt, and E.-L. Lindfors,Nordic Pulp Pap. Res. J.,2, 71 (1987).
T. Yamasaki, S. Hosoya, C.-L. Chen, J.S. Gratzl, and H.-m. Chang, Characterization of Residual Lignin in Kraft Pulp.1st International Symposium on Wood and Pulping Chemistry, Proceedings Vol. 2, p. 34–42, Stockholm (1981).
S. Ljunggren and E. Johansson,Nordic Pulp Pap. Res. J.,5, 148 (1990).
B. Lindgren,Svensk Papperstidn.,74, 57 (1971).
U. Germgård,Prebleaching of Softwood Kraft Pulp with Chlorine Dioxide. Ph.D. Thesis. Royal Institute of Technology, Stockholm (1982).
J. Flink, R. Grundelius, and B. Swan,Modern ECF and TCF Bleaching Non-chlorine Bleaching Conference, Proceedings, Paper 36 (1993).
O. Dahlman, A. Reimann, L. Strömberg, and R. Mörck,On the Nature of High Molecular Weight Effluent Materials from Modern ECF- and TCF-Bleaching. International Pulp Bleaching Conference, Vancouver. Proceedings, Vol. 1, p. 123‐132, (1994).
K.V. Sarkanen, K. Kakehi, R.A. Murphy, and H. White,Tappi,45, 24 (1962).
G.B. Strumila, W.H. and Rapson,Trans. Tech. Sect.,4, TR 42 (1978).
J.J. Kolar, B.O. Lindgren, and B. Pettersson,Wood Sci. Technol.,17, 117 (1983).
C. Brage, T. Eriksson, and J. Gierer,Holzforschung,45, 23, 147 (1991).
Y. Ni, X. Shen, and A.R.P. van Heiningen, Studies on the Reactions of Phenolic a Non-phenolic Lignin Model Compounds with Chlorine Dioxide,7th International Symposium on Wood and Pulping Chemistry, Proceedings, Vol. 1, pp. 230–239, Beijing (1993).
Y. Ni, G.J. Kubes, and A.R.P. van Heiningen,J. Pulp Pap. Sci.,19, J1 (1993).
S. Ljunggren, E. Bergnor, and J. Kolar,Modified Modern Chlorine Dioxide Bleaching.International Pulp Bleaching Conference, Proceedings, Vol. 1, p. 169–176, Vancouver (1994).
A. Teder, and A. Törngren, Chloride Ions and the Formation of AOX in DC-Bleaching.International Pulp Bleaching Conference, Proceedings, Vol. 1, Vancouver (1994).
D.W. Reeve, K.M. Weishar, and Li Li, Process Modifications to decrease Organochlorine Formation during Chlorine Dioxide Delignification.International Pulp Bleaching Conference, Proceedings, Vol. 1, p. 281–287, Vancouver (1994).
M.M. Hurst, R. Korhonen, K. Vakeva, and R. Yant,Pulp Pap. Can.,93, 41 (1992).
M. Erickson, S. Larsson, and G.E. Miksche,Acta Chem. Scand.,27, 903 (1973).
G. Gellerstedt, K. Gustafsson, and E.-L. Lindors,Nordic Pulp Pap. Res. J.,1, 14 (1986).
F. Österberg, and K. Lindström,Holzforschung,39, 149 (1985).
D. Robert, Carbon-13 Nuclear Magnetic Resonance Spectrometry. In:Methods in Lignin Chemistry, S.Y. Lin and C.W. Dence (Eds.), p. 250–273, Springer-Verlag, Berlin, Heidelberg (1992).
K.P. Kringstad, and R. Mörck,Holzforschung,37, 237 (1983).
G. Gellerstedt and D. Robert,Acta Chem Scand,B41, 541 (1987).
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Gellerstedt, G., Lindfors, El., Pettersson, M. et al. Reactions of lignin in chlorine dioxide bleaching of kraft pulps. Res. Chem. Intermed. 21, 441–456 (1995). https://doi.org/10.1007/BF03052269
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DOI: https://doi.org/10.1007/BF03052269