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兰桉CTMP过氧化氢置换漂白工艺和机理的研究
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摘要
本论文对兰桉化学热磨机械浆(CTMP)的单段、两段H_2O_2置换漂白工艺和漂前预处理工艺进行了比较系统的研究,提出了较佳的兰桉CTMP单段H_2O_2置换漂白工艺和螯合预处理工艺,并在此基础上进行了多段(超过两段)H_2O_2置换漂白的模拟。同时,本论文还对螯合预处理以及H_2O_2置换漂白机理进行了较为深入的研究。
     在兰桉CTMP两段H_2O_2置换漂白工艺的研究中,主要研究了各因素对H_2O_2置换漂白的影响规律。结果表明,H_2O_2置换漂白宜采取比常规H_2O_2漂白低一些的pH值,H_2O_2浓度不宜过高。就漂白效率来说,70℃是兰桉CTMP H_2O_2置换漂白由中低温度漂白向较高温度漂白转化的一个过渡温度,70℃以下时的漂白效率高于70℃以上时的漂白效率。漂白效率随着浆浓的增加而迅速下降,这一点完全有别于常规H_2O_2漂白。硅酸钠和硫酸镁的共同存在能有效降低H_2O_2的实际消耗量。较佳的条件为:浆浓10%、90℃、pH值10.6、H_2O_2浓度为10g/l、Na_2SiO_3浓度为2.0—4.0g/l、MgSO_4浓度为0.10g/l。
     单段H_2O_2置换漂白工艺和螯合预处理工艺的研究结果表明,在实验用置换漂白反应器中存在较严重的沟流现象,需要用约两倍于浆层中原有液体的漂液才能基本完全置换完浆层中的液体。白度和H_2O_2消耗量都随表观流速增加而下降,而漂白效率却随表观流速增加而增加。DTPA置换螯合预处理效果比EDTA、DTPA常规螯合预处理的效果都要好。各因素对H_2O_2消耗量影响的大小顺序为:浆层下滤网>纸浆纤维>反应器内表面状况>浆层上滤网。采用聚酯滤网和在反应器内壁涂环氧树酯可以有效降低H_2O_2的消耗量。在较适宜的单段H_2O_2置换漂白条件下,漂后浆白度可达77.1%(ISO),白度增值为29.5%(ISO),H_2O_2消耗量为1.4%,漂白效率为21.1。在铝质容器中,H_2O_2漂液显示出较好的稳定性,H_2O_2漂液在内表面较光洁的铝质容器内的稳定性与在内表面涂环氧树酯的不锈钢置换漂白反应器内的稳定性基本一样。
     多段H_2O_2置换漂白的模拟试验结果表明,漂后浆白度随新鲜漂液H_2O_2浓度的提高而提高,但在相同的新鲜漂液H_2O_2浓度下,不同漂液量时的漂后浆白度基本相同。H_2O_2消耗量随新鲜漂液H_2O_2浓度和漂液量的下降而下降,漂白效率的变
The one- and two-stage H_2O_2 displacement bleaching processes and pretreatment processes before bleaching of E.globulus chemithermomechnical pulp (CTMP) were studied in this dissertation. Better processes of one-stage H_2O_2 displacement bleaching and chelating pretreatment of E.globulus CTMP were brought forward. The multi-stage (more than two-stage) H_2O_2 displacement bleaching process was simulated. Meanwhile, mechanisms of chelating pretreatment and H_2O_2 displacement bleaching were investigated in this dissertation.
    Influence of various factors on two-stage H_2O_2 displacement bleaching of Eglobulus CTMP was investigated .The results showed that the pH of H_2O_2 displacement bleaching should be lower than that of H_2O_2 conventional bleaching. H_2O_2 concentration in bleach liquor should not be too high. The temperature of 70℃ was a transition temperature to bleaching efficiency of E.globulus CTMP H_2O_2 displacement bleaching. The bleaching efficiency under 70℃ was higher than that of more than 70 ℃.It was totally different from H_2O_2 conventional bleaching that the bleaching efficiency dropped down rapidly along with the increase of pulp consistency. The H_2O_2 consumption decreased effectively when both sodium silicate and magnesium sulphate were present in bleach liquor. The better conditions were: 10% pulp consistency, pH 10.6,bleach liquor containing 10g/l H_2O_2,2-4g/l Na_2SiO_3 and 0.10g/l MgSO_4.
    The study on one-stage H_2O_2 displacement bleaching and chelating pretreatment showed that the phenomenon of channeling was relatively serious in laboratory displacement bleaching reactor. The volume of bleach liquor of using to displace the liquor in the pulp pad completely was about twice as much as the volume of the liquor in the pulp pad. Brightness and H_2O_2 consumption decreased along with the increase of superficial velocity, but bleaching efficiency increased along with the increase of superficial velocity. The effect of DTPA chelating pretreatment by displacement method was better than that of EDTA and DTPA chelating pretreatment by conventional method. The influencing sequence of various factors on H_2O_2 consumption was as following:
引文
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