A Theoretical Basis for the Hot Chlorine Dioxide Bleaching Process and Mill Results from the First Installation

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  • 高温二酸化塩素漂白の理論的基礎および第1号設備における操業結果
  • コウオン 2サンカ エンソ ヒョウハク ノ リロンテキ キソ オヨビ ダイ1ゴウ セツビ ニ オケル ソウギョウ ケッカ

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Abstract

Hot chlorine dioxide bleaching is rapidly evolving to become the standard choice for the first bleaching stage in an ECF sequence for HW kraft pulp. In this article data from experiments on a large number of different HW species are presented with respect to their bleachability in a D*ED (D*here denotes hot chlorine dioxide bleaching) sequence compared to in a DED sequence. Results from the operation of the first mill installation of hot chlorine dioxide bleaching are compared and found to agree well with the laboratory results. Finally hot chlorine dioxide bleaching is compared with hot acid treatment followed by chlorine dioxide bleaching, (AD)*technology. In addition a 2-stage bleaching sequence including hot chlorine dioxide bleaching, (DQ)*(PO) is included in the comparison of e. g. strength properties and bleaching chemical costs. It is concluded that the 2-stage sequence shows a lot of benefits compared to the other sequences and that this is even more true in a Japanese context.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 57 (7), 975-984,014, 2003

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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