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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Sulfuric acid bleaching of kraft pulp III: reactivity of kraft pulping-resistant structures under acidic conditions

Journal of Wood Science volume 45, pages 417–424 (1999)Cite this article

Abstract

To investigate the bleaching mechanism, a lignincarbohydrate complex (LCC) model compound, a vinyl ether-type lignin model dimer, and a hexeneuronic acid model compound were treated with dilute sulfuric acid of different pHs. Beech kraft pulp and red pine kraft pulp were also treated with dilute sulfuric acid and then extracted with aqueous alkali. The amount of hexeneuronic acid degradation products in acid effluents and lignin dissolved in alkali effluents were determined. It was found that the benzyl ether-type LCC bond and the vinyl ether bond in lignin were effectively cleaved under the pH where sulfuric acid bleaching of kraft pulp was effective. Hexeneuronic acid group was also effectively degraded during sulfuric acid bleaching. In beech kraft pulp bleaching, both lignin removal and hexeneuronic acid removal contributed to the kappa number reduction. In red pine bleaching, the contribution of hexeneuronic acid removal was negligible, and most of the kappa number reduction was achieved by the lignin removal.

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Authors and Affiliations

  1. Institute of Agricultural and Forest Engineering, The University of Tsukuba, 1-1-1 Tennoudai, 305-0006, Ibaraki, Japan

    Tsutomu Ikeda, Mitsuro Ishihara & Shuji Hosoya

  2. Wood Chemistry Division, Forestry and Forest Products Research Institute, PO Box 16, 305-8687, Tsukuba Norin Kenkyu Danchi-nai, Ibaraki, Japan

    Yoichi Tomimura, Kengo Magara & Shuji Hosoya

Authors
  1. Tsutomu Ikeda
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  2. Yoichi Tomimura
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  3. Kengo Magara
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  4. Mitsuro Ishihara
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  5. Shuji Hosoya
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Correspondence to Shuji Hosoya.

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Ikeda, T., Tomimura, Y., Magara, K. et al. Sulfuric acid bleaching of kraft pulp III: reactivity of kraft pulping-resistant structures under acidic conditions. J Wood Sci 45, 417–424 (1999). https://doi.org/10.1007/BF01177915

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  • DOI: https://doi.org/10.1007/BF01177915

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