Formation of PCDDs and PCDFs during the combustion of polyvinylidene chloride and other polymers in the presence of HCl.
Formation of PCDDs and PCDFs during the combustion of polyvinylidene chloride and other polymers in the presence of HCl.
复制标题
聚偏二氯乙烯和其他聚合物在 HCl 存在下燃烧时会形成 PCDD 和 PCDF。
DOI：
10.1016/j.chemosphere.2003.07.002
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发表时间：
2004
期刊：
影响因子：
8.8
通讯作者：
Tadashi Nakamura
中科院分区：
文献类型：
--
作者：
M. Ohta;S. Oshima;N. Osawa;T. Iwasa;Tadashi Nakamura
PVDC和三种非氯化聚合物（PP， PET和PA）在实验室规模的石英管式炉中，在HCl（约500 ppm = 0.8 mg/l）的存在下，在700-850℃下焚烧，并研究了PCDD/Fs的气相形成，它们的假定前驱体和它们的同系物谱。HCl的加入对PVDC燃烧过程中PCDD/Fs的生成水平影响不大或没有明显影响，其同系物谱与三种非氯化聚合物的同系物谱有很大不同。对于PVDC， O8CDD，特别是O8CDF是迄今为止最普遍的，显然是前体选择性形成的结果。对于这三种非氯化聚合物，在HCl存在下，在800°C或更高温度下燃烧，PCDD/Fs的形成水平等于或超过PVDC。在相同条件下使用其中一种（PP）进行的试验中，使用大聚合物样品（所有其他试验中为100 mg对20 mg）， PCDD/Fs的形成水平远远高于较小的聚合物样品，从而证明了适当的燃烧条件对聚合物焚烧的重要性。
PVDC and three non-chlorinated polymers (PP, PET, and PA) were incinerated at 700–850 °C in a laboratory-scale quartz tubular furnace in the presence of HCl (ca. 500 ppm≅0.8 mg/l), and the gas-phase formation of PCDD/Fs, their putative precursors and their homologue profiles were investigated. The addition of HCl had little or no apparent effect on the level of PCDD/Fs formation during PVDC combustion, and their homologue profiles were quite different from those of the three non-chlorinated polymers. With PVDC, O8CDD and particularly O8CDF were by far most prevalent, apparently as a result of the selective formation of the precursors. With each of the three non-chlorinated polymers, combustion at 800 °C or higher in the presence of HCl resulted in PCDD/Fs formation at levels equaling or exceeding those observed with PVDC. In trials made with one of them (PP) under the same conditions but using a large polymer sample (100 mg vs 20 mg in all other trials), the level of PCDD/Fs formation was far higher than with the smaller polymer samples, and thus demonstrated the importance of appropriate combustion conditions for polymer incineration.