Skip to main content
Journal of Wood Science

Official Journal of the Japan Wood Research Society

Download PDF
  • Original Article
  • Published:

Sulfuric acid bleaching of kraft pulp 1: Bleaching of hardwood and softwood kraft pulps

Journal of Wood Science volume 45, pages 233–237 (1999)Cite this article

Abstract

To develop a new nonchlorine bleaching technology, hardwood and softwood kraft pulps, before and after oxygen-alkali predelignification, were treated with dilute sulfuric acid solutions (pH 1.0-1.8) at 100°C for 1 h and then extracted with aqueous sodium hydroxide at 70°C for l h. Hardwood kraft pulp was successfully bleached. The delignification selectivity was similar to that seen with oxygen-alkali bleaching; and it was greatly enhanced by the addition of sodium nitrate and sodium nitrite. The sulfuric acid bleaching can replace the presently adopted oxygen and chlorine stages if the additives are allowed. This bleaching process was also effective for oxygen-bleached hardwood kraft pulp, but it was less effective for softwood kraft pulp and oxygen-bleached softwood kraft pulp. The effectiveness of the addition of sodium nitrate and sodium nitrite was more apparent for softwood kraft pulp than for hardwood kraft pulp.

References

  1. 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, vol 2, pp 34–42

    CAS  Google Scholar 

  2. Tanaka K, Nakatubo F, Higuchi T (1979) Reactions of guaiacylglycerol-β-guaiacyl ether with several sugars. II. Reaction of quinonemethide with pyranohexoses (in Japanese). Mokuzai Gakkaishi 25:653–659

    CAS  Google Scholar 

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

    Article  CAS  Google Scholar 

  4. Gierer J (1985) Chemistry of delignification. Part 1. General concept and reactions during pulping. Wood Sci Technol 19:289–312

    CAS  Google Scholar 

  5. Nimz HH, Granzow C, Berg A (1986) Acetosolv pulping. Holz Roh Werkstoff 44:362

    Article  CAS  Google Scholar 

  6. Rasmusson D, Samuelson O (1993) Influence of the gas phase during treatment of kraft pulp with nitrogen oxides. Nordic Pulp Paper Res J 8:292–297

    Article  CAS  Google Scholar 

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

    Article  CAS  Google Scholar 

  8. Kishino M, Ohi H, Ikegami K, Yamaguchi A (1996) Mechanism of delignification by nitrous acid. II. Degradation of an α-alkyl ether of nonphenolicβ-O-4 type lignin model compound. Mokuzai Gakkaishi 42:95–100

    CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

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

    Shuji Hosoya, Yoichi Tomimura, Kengo Magara & Isao Takano

  2. Institute of Agricultural and Forest Engineering, The University of Tsukuba, 305-0006, Tsukuba, Japan

    Tsutomu Ikeda & Shuji Hosoya

Authors
  1. Tsutomu Ikeda
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Shuji Hosoya
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Yoichi Tomimura
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Kengo Magara
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Isao Takano
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Shuji Hosoya.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Ikeda, T., Hosoya, S., Tomimura, Y. et al. Sulfuric acid bleaching of kraft pulp 1: Bleaching of hardwood and softwood kraft pulps. J Wood Sci 45, 233–237 (1999). https://doi.org/10.1007/BF01177731

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01177731

Key words