Chlorine-free Bleaching of Eucalyptus Kraft Pulp Using a Mixture of Peroxymonosulfuric Acid and a Trace of Chlorine Dioxide

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  • Xu Yinchao
    School of Environmental and Natural Resources, Zhejiang University of Science and Technology
  • Huang Rong
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • Salaghi Ayyoub
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • Jin Guangfan
    School of Environmental and Natural Resources, Zhejiang University of Science and Technology
  • Nakagawa-Izumi Akiko
    Faculty of Life and Environmental Sciences, University of Tsukuba

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Other Title
  • モノ過硫酸と微量の二酸化塩素混合物を用いるユーカリクラフトパルプの無塩素漂白
  • モノ カリュウサン ト ビリョウ ノ ニサンカ エンソ コンゴウブツ オ モチイル ユーカリクラフトパルプ ノ ムエンソ ヒョウハク

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Abstract

<p>This study proposed eco-friendly chlorine-free bleaching as a method of pulp production for papermaking. As a wood species with excellent cooking ability, 12-year-old Eucalyptus globulus wood chips were kraft-cooked and oxygen (O)-bleached in a laboratory, and then the bleaching response was evaluated. In addition, these were compared with an O-bleached kraft mill pulp (LOKP), which was produced in a mill from mixed wood chips of E. globulus and Acacia spp. A five-stage bleaching sequence (O-Psa-Ep-Psa-Ep) using O-bleaching, peroxymonosulfuric acid (Psa) treatment and alkaline hydrogen peroxide (Ep) treatment was adopted. Produced E. globulus kraft pulp (yield: 50.1%, kappa number: 16.0, brightness: 33.3% ISO, viscosity 72.2 mPa·s) provided a bleached pulp with brightness of 88.6% ISO and viscosity of 10.8 mPa·s. Using a modified bleaching process by adding a small amount of ClO2 to the Psa stages in a sequence of O-(Psa+ClO2)-Ep-(Psa+ClO2)-Ep, viscosity of the bleached pulp was increased to 12.3 mPa·s with no significant change in brightness. The LOKP resulted in brightness of 90.1% ISO and viscosity of 8.7 mPa·s in the O-Psa-Ep-Psa-Ep sequence, and the viscosity was improved to 9.4 mPa·s in the O-(Psa+ClO2)-Ep-(Psa+ClO2)-Ep sequence.</p>

Journal

  • Mokuzai Gakkaishi

    Mokuzai Gakkaishi 67 (4), 217-222, 2021-10-25

    The Japan Wood Research Society

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