| 变压器油中的PCB纳米氢化钠化学脱氯的定量表征 |
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| 引用本文： | 张青,梁鑫淼,徐杰,陈吉平,卢佩章. 变压器油中的PCB纳米氢化钠化学脱氯的定量表征[J]. 精细化工, 2004, 21(7): 540-543 |
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| 作者姓名： | 张青 梁鑫淼 徐杰 陈吉平 卢佩章 |
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| 作者单位： | 中国科学院,大连化学物理研究所,辽宁,大连,116012;中国科学院,大连化学物理研究所,辽宁,大连,116012;中国科学院,大连化学物理研究所,辽宁,大连,116012;中国科学院,大连化学物理研究所,辽宁,大连,116012;中国科学院,大连化学物理研究所,辽宁,大连,116012 |
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| 摘 要： | 开发了在温和条件下,利用自行合成的纳米氢化钠深度脱除变压器油中的多氯联苯(PCB)技术。总质量分数为0 5%的PCB可以降解到0 028%,降解后的溶液用纳米氢化钠二次处理后,PCB总质量分数可进一步降解到0 0001%。基于GC/ECD的检测技术,评价了纳米氢化钠的脱氯效果以及其去毒性效应。结果表明,氯原子数目越多,分子对称性越差,脱氯反应越快;从五氯联苯脱氯表征发现PCB上的脱氯活性的顺序依次为:对>间>邻;在脱氯过程中,由于高氯原子数的联苯降解为低氯原子数的联苯,纳米氢化钠脱氯技术还降低了PCB的毒性。
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| 关 键 词： | 脱氯 变压器油 PCB 纳米氢化钠 |
| 文章编号： | 1003-5214(2004)07-0540-04 |
Chemical Dechlorination of PCB in Transformer Oil by Use of Nano-NaH and Its Assessment |
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| Abstract: | A deep dechlorination of polychlorinated biphenyls(PCB) in transformer oil by use of nano-NaH synthesized under mild condition is reported.Total mass percentage of PCB of 0.5% could be decreased to 0.028%,and even to less than 0.0001% after using newly prepared NaH for the second time.Based on the chromatographic analysis with GC/ECD detection,the effects of dechlorination and detoxification were estimated.The results indicate that the chlorobiphenyls with more chlorine atoms and less molecular symmetry could be dechlorinated more easily.For pentachlorobiphenyl the dechlorinated activity of chlorine atoms on different positions was found in the order of para->meta->ortho-.The toxicity of PCB in the mixture of transformer oil could be reduced along with the dechlorination reaction. |
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| Keywords: | dechlorination PCB transformer oil nano-NaH |
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