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首页> 外文期刊>Holzforschung >Reduction of adsorbable organically bound halogens (AOX) formation at near-neutral pH chlorine dioxide bleaching of softwood kraft pulp
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Reduction of adsorbable organically bound halogens (AOX) formation at near-neutral pH chlorine dioxide bleaching of softwood kraft pulp

机译：近中立磷酸二氧化氯浆裂解近中性pH氯二氧化氯的可吸附有机结合的卤素（AOX）形成

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摘要

Recently, a new type of bleaching sequence, Elemental Chlorine Free (ECF) light with one D stage, has been developed. It combines the efficiency and high selectivity of chlorine dioxide (ClO2) bleaching with more environmental friendly oxygen based bleaching chemicals. This work examines the effect of pH on the formation of adsorbable organically bound halogens (AOX) in an intermediate D stage - a single ClO2 stage at the middle of an ECF light bleaching sequence. Carbon dioxide (CO2) is used to generate a bicarbonate buffer in situ, stabilizing the pH during the bleaching. Near-neutral pH is hypothesized to decrease the formation of strongly chlorinating species, so that the AOX formation is reduced. The results indicate that a near-neutral pH D stage can reduce the AOX content in the effluents with up to 30%. The ISO brightness was unchanged to a lower ClO2 consumption. The pulp viscosity was slightly higher after near-neutral pH D stage, but to its disadvantage a lesser delignification and removal of HexA was obtained. The degradation of HexA correlated well with the AOX, affirming earlier theories that HexA has a major impact on the AOX formation. The higher amounts of residual HexA and lignin resulted in more thermal yellowing of the pulps bleached with a near-neutral pH D stage.
机译：最近，已经开发出一种新型的漂白序列，元素氯（ECF）光，具有一级D级。它将二氧化氯（CLO2）漂白的效率和高选择性与更多环保型氧气的漂白化学品相结合。该作品研究了pH对在中间D阶段中可吸附有机结合卤素（AX）的形成的影响 - 在ECF光漂白序列中间的单个ClO2阶段。二氧化碳（CO 2）用于原位产生碳酸氢盐缓冲液，在漂白期间稳定pH。近中性pH值是假设的，以减少强烈氯化物质的形成，从而降低了Ax形成。结果表明，近中性pH d阶段可以将烟雾中的AOX含量降低至多30％。 ISO亮度与较低的CLO2消费量保持不变。近中性pH D阶段后纸浆粘度略高，但是其缺点是获得较小的脱蛋白化和去除六藻。 Hexa的降解与AOX相比好，肯定了六年对AOX形成产生重大影响的早期理论。较高量的残余六躯和木质素导致纸浆的热黄化与近中性pH d阶段漂白。

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  • 来源
    《Holzforschung》 |2020年第6期|597-604|共8页
  • 作者

    Starrsjo Sara; Sevastyanova Olena; Sandstrom Peter; Fiskari Juha; Boman Maria; Lindstrom Mikael E.;

  • 作者单位

    SCA R&D Ctr Sidsjovagen 2 S-85121 Sundsvall Sweden|KTH Royal Inst Technol Tekn Ringen 56-58 S-10044 Stockholm Sweden|Mid Sweden Univ Dept Chem Engn Holmgatan 10 S-85170 Sundsvall Sweden;

    KTH Royal Inst Technol Dept Fiber & Polymer Chem Tekn Ringen 56-58 S-10044 Stockholm Sweden;

    SCA R&D Ctr Sidsjovagen 2 S-85121 Sundsvall Sweden;

    Mid Sweden Univ Dept Chem Engn Holmgatan 10 S-85170 Sundsvall Sweden;

    SCA R&D Ctr Sidsjovagen 2 S-85121 Sundsvall Sweden;

    KTH Royal Inst Technol Dept Fiber & Polymer Chem Tekn Ringen 56-58 S-10044 Stockholm Sweden;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    AOX; chlorine dioxide bleaching; hexenuronic acid; kraft pulp; near-neutral pH bleaching; softwood;

    机译：AOX;二氧化氯漂白;己醛酸;牛皮纸浆;近中性pH漂白;软木;

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