Skip to main content

Advertisement

Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image
We’d like to understand how you use our websites in order to improve them. Register your interest.

Sulfuric acid bleaching of kraft pulp II: Behavior of lignin and carbohydrate during sulfuric acid bleaching

Abstract

The purpose of this study was to investigate the behavior of lignin and carbohydrates in kraft pulps during sulfuric acid bleaching. Beech kraft pulp and red pine kraft pulp were bleached with dilute sulfuric acid at pH 1.3 with addition of sodium nitrate and sodium nitrite at 100°C for 1 h. The pulps were then extracted with aqueous sodium hydroxide solution at 70°C for 1 h. Lignin and carbohydrates in the acid effluents and the alkali effluents were analyzed. The carbohydrate compositions of unbleached and bleached kraft pulps were also determined. The residual lignin in kraft pulp was degraded to a molecular size similar to that of milled wood lignin during sulfuric acid bleaching without additives, and it was further degraded to a much smaller molecular size during sulfuric acid bleaching with additives. It was found that the amount of carbohydrate dissolved in the bleach effluents were only about 1 of the dry weight of the kraft pulp under these bleaching conditions. The carbohydrates dissolved during bleaching were mostly of hemicellulose origin.

References

  1. 1.

    Ikeda T, Hosoya S, Tomimura Y, Magara K, Takano I (1999) Sulfuric acid bleaching of kraft pulp I: Bleaching of hardwood and softwood kraft pulps. J Wood Sci 45:233–237

  2. 2.

    Yamasaki T, Hosoya S, Chen CL, Gratzl JS, Chang H-M (1981) Characterization of residual lignin in kraft pulp. In: International symposium on wood and pulping chemistry, Stockholm, June 9–12, vol 2, pp 34–42

  3. 3.

    Taneda H, Nakano J, Hosoya S, Chang H-M (1987) Stability of aether type model compounds during chemical pulping processes. J Wood Chem Technol 7:485–498

  4. 4.

    Vuorinen T, Telman A, Fagerström P, Buchert J, Tenkanen M (1996) Selective hydrolysis of hexeneuronic acid groups and its application in ECF and TCF bleaching of kraft pulps. In: International pulp bleaching conference, Atlanta, April 14–18, Book 1, pp 43–51

  5. 5.

    Gellerstedt G, Li J (1996) An HPLC method for the quantitative determination of hexeneuronic acid groups in chemical pulps. Carbohydr Res 294:41–51

  6. 6.

    Lundquist K (1964) On the separation of lignin degradation products. Acta Chem Scand 18:1316–1317

  7. 7.

    Ohi H, Kishino M (1997) Cleavage of Cα-Cβ bonds of lignin model compounds by nitrite and nitric acid. Holzforschung 51:343–348

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to Shuji Hosoya.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Ikeda, T., Tomimura, Y., Magara, K. et al. Sulfuric acid bleaching of kraft pulp II: Behavior of lignin and carbohydrate during sulfuric acid bleaching. J Wood Sci 45, 313–318 (1999). https://doi.org/10.1007/BF00833496

Download citation

Key words

  • Sulfuric acid bleaching
  • Nonchlorine bleaching
  • Residual lignin
  • Kraft pulp