【作者】 王蕊；

【导师】 钱学仁；

【作者基本信息】 东北林业大学 ， 林产化学加工工程， 2004， 硕士

【摘要】 本论文提出对纸浆过氧化氢漂白实施后程活化的设想，并通过实验验证了后程活化的有效性和实用性。研究结果表明： （1）通过适时适度二次补碱（即采用“二次加碱”工艺）可实现纸浆过氧化氢漂白的后程活化，从而优化纸浆过氧化氢漂白过程。越在后期二次补碱越有利于提高白度。在一定范围内二次补碱量越大越有利于提高白度，但补加碱量不可过多，否则会同时促进副反应的发生。总碱分配比为1：3时最有利于提高白度和过氧化氢漂白效率。 （2）以四乙酰乙二胺和邻菲罗啉作为活化剂，着重讨论了添加活化剂的“时”（即添加时机）和“度”（即添加水平）对纸浆H₂O₂漂白过程的影响。活化剂的加入量不易过高，而且应尽量在反应后期加入到体系中。这样可以尽量避免对碳水化合物的降解。 （3）在硅酸钠、硫酸镁，改性蛋白石和层硅这三种不同的稳定体系中都存在着后程活化效应。稳定体系不同后程活化效应大小不同。使用层硅做稳定剂的后程活化效果最好，它最有利于白度的提高，同时对碳水化合物的降解程度最小。使用改性蛋白石做稳定剂时，也有利于提高白度，但它对碳水化合物的破坏作用很强。 （4）本文初步提出并设计了一个纸浆H₂O₂漂白后程活化的工程实施方案，即在工程上采用双塔流程替代传统的单塔流程实施纸浆H₂O₂漂白的后程活化。该方法简便易行，经济实用。更多还原

【Abstract】 The possibility of anaphase activation on hydrogen peroxide bleaching was investigated in this paper, and its validity and practicability were identified through experiments. The results showed that:(1)The anaphase activation on hydrogen peroxide bleaching can be realized by secondary alkali addition in optimum occasion and quantity, thus the hydrogen peroxide bleaching can be optimized. Results showed that the secondary alkali additives added later is more favorable to brightness development. The quantity of secondary alkali additives increase to some extent is of benefit to brightness development, but it should not be added too much, otherwise it can accelerate the subsidiary reaction. The best proportion of the total alkali is 1:3, it is best for brightness development and efficiency of hydrogen peroxide bleaching.(2)The effect of activator addition occasion and quantity on hydrogen peroxide bleaching was discussed by using the TAED and phenanthroline as activators. The activators should not be added so much, but it should be added in the anaphase so as to avoid carbohydrate degradation.(3)The anaphase activation exists in three different stabilizers, sodium silicate, magnesium sulphate, modified zeolite and layer crystalline sodium silicate. The anaphase activation efficiency differs with different stabilizer. When layer crystalline sodium silicate acts as stabilizer, the anaphase activation efficiency is the best, it is in favor of brightness development and carbohydrate degradation. The modified zeolite acts as stabilizer is also of benefit to brightness development, but it is disadvantage for carbohydrate degradation.(4)The industrial project of anaphase activation on hydrogen peroxide bleaching was put forward in this article, the two bleaching tower flow replaced single bleaching tower flow in this project. This process is simple, feasible and economic practicality.更多还原