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首页> 外文期刊>Chemical and Process Engineering Research >Study of the Influence of Bleaching Process Time on the Brightness of the De-Inked Waste Paper Pulp Using Hydrogen Peroxide as a Bleaching Agent
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Study of the Influence of Bleaching Process Time on the Brightness of the De-Inked Waste Paper Pulp Using Hydrogen Peroxide as a Bleaching Agent

机译：以过氧化氢为漂白剂的漂白时间对脱墨废纸浆白度影响的研究

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This research aims to study bleaching time influence on the brightness level of the de-inked waste paper pulp using hydrogen peroxide as a bleaching agent, and that will be through evaluating how pulp brightness changes within a range of process times. In addition, the kinetics of the bleaching reaction is studied and analyzed.The experiments were conducted using a laboratory pulper designed to simulate the industrial pulpers, but also modified to meet the goals and conditions of the research.The results show that brightness increases with bleaching time, and the optimum time for bleaching process at research conditions was determined at 70 min. It is also found that applying longer times would contribute with only minimum additions on brightness and that do not justify the costs of operating with extended periods. On the other hand, lowering process time below 70 min may result in a considerable decrease in the brightness of the recycled pulp. Here, kinetics shows a significant remaining amount of peroxide after the process ends, which leads to lower brightness and efficiency.
机译：这项研究旨在研究漂白时间对使用过氧化氢作为漂白剂的脱墨废纸纸浆亮度的影响，这将通过评估纸浆亮度在处理时间范围内的变化来进行。此外，还对漂白反应的动力学进行了研究和分析。实验是使用实验室碎浆机进行的，该碎浆机旨在模拟工业碎浆机，但也进行了修改以满足研究目的和条件。结果表明，漂白后亮度增加时间，并且在研究条件下确定漂白过程的最佳时间为70分钟。还发现，应用更长的时间只会对亮度的增加产生最小的贡献，并且不能证明长时间运行的成本是合理的。另一方面，将处理时间降低到70分钟以下可能会导致回收纸浆的亮度显着下降。在此，动力学过程结束后显示出大量的过氧化物残留，这导致较低的亮度和效率。

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