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    • 9. 发明专利
    • Method for bleaching kraft pulp
    • 漂洗纸浆的方法
    • JP2008202160A
    • 2008-09-04
    • JP2007038712
    • 2007-02-20
    • Daio Paper Corp大王製紙株式会社
    • AI BAN TORAN
    • D21C9/14D21C9/153D21C9/16
    • PROBLEM TO BE SOLVED: To reduce the COD and chromaticity load in a bleaching drainage generated from the bleaching process of a kraft pulp in a paper-making plant.
      SOLUTION: In the case of carrying out multistage bleaching of a digested pulp in the production of a bleached kraft pulp by an ECF bleaching method, a bleaching step with chlorine dioxide is placed after an ozone bleaching step without using an alkali-extraction step after the ozone bleaching step. Preferably, a bleaching process composed of a combination of a chlorine dioxide bleaching step and a hydrogen peroxide bleaching step is carried out after the ozone bleaching step. Preferably, an acid treating process is carried out after the ozone bleaching step.
      COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:降低由造纸厂的牛皮纸浆漂白过程产生的漂白排水中的COD和色度负荷。 解决方案:在通过ECF漂白方法在漂白牛皮纸浆的生产中进行消化纸浆的多级漂白的情况下,在臭氧漂白步骤之后,使用二氧化氯进行漂白步骤而不使用碱提取 臭氧漂白步骤之后。 优选地,在臭氧漂白步骤之后进行由二氧化氯漂白步骤和过氧化氢漂白步骤的组合组成的漂白工艺。 优选地,在臭氧漂白步骤之后进行酸处理过程。 版权所有(C)2008,JPO&INPIT