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首页> 外文期刊>Journal of Environmental Science and Health >Recycling of transformer oil contaminated by polychlorinated biphenyls (PCBs) using catalytic hydrodechlorination
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Recycling of transformer oil contaminated by polychlorinated biphenyls (PCBs) using catalytic hydrodechlorination

机译：使用催化加氢脱氯回收被多氯联苯（PCB）污染的变压器油

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摘要

Catalytic hydrodechlorination of polychlorinated biphenyls (PCBs) in the presence of transformer oil was carried out in a batch mode to detoxify PCBs and to recycle the treated oil. Various metal supported catalysts, including 0.98 wt% Pt, 0.79 wt% Pd and 12.8 wt% Ni on γ-alumina (γ-Al_2O_3) support, and 57.6 wt% Ni on silicon oxide-aluminum oxide (SiO_2-Al_2O_3) support were used for the hydrodechlorination. Metal particle size of the Pt catalyst was 2.0 nm and metal particle sizes of the Pd and Ni catalysts were in the range of 6.4-6.9 nm. Various supercritical fluids, supercritical carbon dioxide (scCO_2), supercritical propane (scPropane), supercritical dimethyl ether (scDME) and supercritical isobutane (sclsobutane) were used as reaction media. PCBs conversion, dechlorination degree of PCBs, was measured using gas chromatograph (GC) with an electron capture detector (ECD). The hydrodechorination degree increased in the order Ni > Pd > Pt, possibly due to higher metal loading and larger metal size of the Ni catalysts. At temperatures below 175℃, scCO_2 was effective as the reaction media for the catalytic hydrodechlorination of PCBs in the presence of the transformer oil. However, PCBs conversion decreased significantly when the hydrodechlorination was carried out in a homogeneous phase with using scPropane, scDME or sclsobutane as a reaction medium. This was attributed to dilution effect of the supercritical fluids. Molecular weights of the transformer oils before and after the catalytic hydrodechlorination were analyzed using high-performance size exclusion chromatography (HPSEC). The molecular weight of the treated oil with 100 % PCBs conversion did not change after the catalytic hydrodechlorination at 200℃. This process has proven to be effective to detoxify PCBs containing transformer oil and to recycle the treated oil.
机译：在存在变压器油的情况下，以分批方式对多氯联苯（PCB）进行催化加氢脱氯，以使PCB脱毒并回收处理后的油。使用各种金属负载催化剂，包括在γ-氧化铝（γ-Al_2O_3）载体上的0.98 wt％Pt，0.79 wt％Pd和12.8 wt％的Ni和在氧化硅-氧化铝（SiO_2-Al_2O_3）载体上的57.6 wt％的Ni用于加氢脱氯。 Pt催化剂的金属粒径为2.0nm，Pd和Ni催化剂的金属粒径为6.4〜6.9nm。各种超临界流体，超临界二氧化碳（scCO_2），超临界丙烷（scPropane），超临界二甲醚（scDME）和超临界异丁烷（sclsobutane）被用作反应介质。使用带有电子捕获检测器（ECD）的气相色谱仪（GC）测量PCB的转化率，即PCB的脱氯程度。加氢脱卤度按Ni> Pd> Pt的顺序增加，这可能是由于Ni催化剂的较高金属负载量和较大金属尺寸所致。在低于175℃的温度下，scCO_2可以有效地用作变压器油存在下PCBs催化加氢脱氯的反应介质。但是，当使用scPropane，scDME或sclsobutane作为反应介质在均相中进行加氢脱氯时，PCBs转化率显着下降。这归因于超临界流体的稀释作用。使用高性能尺寸排阻色谱法（HPSEC）分析催化加氢脱氯前后的变压器油的分子量。 200℃催化加氢脱氯后，PCBs转化率为100％的处理油的分子量没有变化。事实证明，该方法可有效地去除含有变压器油的PCB的毒害并回收处理过的油。

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  • 来源
    《Journal of Environmental Science and Health》 |2009年第5期|494-501|共8页
  • 作者

    HYE-MIN CHOI; BAMBANG VERIANSYAH; JAEHOON KIM; JAE-DUCK KIM; YOUN-WOO LEE;

  • 作者单位

    Supercritical Fluid Research Laboratory, Energy and Environmental Research Division, Korea Institute of Science and Technology (KIST), Seoul, Korea;

    Supercritical Fluid Research Laboratory, Energy and Environmental Research Division, Korea Institute of Science and Technology (KIST), Seoul, Korea;

    Supercritical Fluid Research Laboratory, Energy and Environmental Research Division, Korea Institute of Science and Technology (KIST), Seoul, Korea;

    Supercritical Fluid Research Laboratory, Energy and Environmental Research Division, Korea Institute of Science and Technology (KIST), Seoul, Korea;

    School of Chemical and Biological Engineering, Seoul National University, Seoul, Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    transformer oil; PCBs; supported catalyst; hydrodechlorination;

    机译：变压器油;PCB;负载型催化剂加氢脱氯;

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