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    • 1. 发明申请
    • PROCESS OF CHLORINE DIOXIDE BLEACHING OF CHEMICAL PULPS USING MAGNESIUM HYDROXIDE OR MAGNESIUM OXIDE
    • 使用氢氧化镁或氧化镁的化学粉末氯化二氧化氯漂白工艺
    • WO2009117818A1
    • 2009-10-01
    • PCT/CA2009/000367
    • 2009-03-25
    • UNIVERSITY OF NEW BRUNSWICKNI, YonghaoHE, Zhibin
    • NI, YonghaoHE, Zhibin
    • D21C9/14
    • D21C9/142D21C9/1036
    • The present invention provides an improved process for chlorine dioxide bleaching of chemical pulps in an aqueous suspension, which uses magnesium hydroxide or magnesium oxide. The process involves the addition of magnesium hydroxide or magnesium oxide to the pulp, in addition to chlorine dioxide, maintaining the mixture at a pH between about 2.5 to 7.5 for about 1 or more hours, most suitably between about 1 - 4 hours. This process can be used in the D1 or D2 stage of a typical D 0 E op D 1 E 2 D 2 bleaching sequence, as well as in the chlorine dioxide brightening stage of other three, four, five, and six-stage bleaching sequences of either the so-called ECF process, or those containing elemental chlorine (Cl 2 ). The temperature is between about 40 to about 90°C, and the pulp consistency is between about 1 to about 16%.
    • 本发明提供了使用氢氧化镁或氧化镁的水性悬浮液中化学纸浆二氧化氯漂白的改进方法。 该方法除了二氧化氯之外还向纸浆中加入氢氧化镁或氧化镁,将混合物保持在约2.5至7.5之间的pH约1或更多小时,最合适地在约1至4小时之间。 该方法可用于典型的D0EopD1E2D2漂白序列的D1或D2阶段,也可用于所谓ECF工艺的其他三,四,五和六级漂白序列的二氧化氯增白阶段, 或含有元素氯(Cl2)的那些。 温度在约40至约90℃之间,纸浆稠度在约1至约16%之间。