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Decomposition Process for Polychlorobiphenyls by Means of Basic Molten Salts

机译：碱性熔融盐分解多氯联苯的方法

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摘要

The decomposition of polychlorobiphenyls (PCBs) by means of basic molten salts was investigated in order to construct a safe, simple and highly efficient waste treatment system for PCBs. PCBs (mono, di, tri, tetra, penta, hexa, hepta-chlorobiphenyls) solution was injected into basic molten salts (KOH–K_(2)CO_(3) or NaOH–Na_(2)CO_(3)) at 773–973 K with oxygen or imitation air. The mass of residual PCBs in the exhaust after the decomposition and the mass of PCBs condensed inside the reaction vessel were measured by using gas chromatograph mass spectrometry, and the decomposition efficiency of PCBs was determined. The decomposition efficiency was also determined from the residual concentration of PCBs in the exhaust in some experiments. The decomposition efficiency was high regardless of the number of chlorine contained in PCBs and reached to very high of 99.999% in an optimum condition. Chlorine of PCBs was captured in basic molten salts, and organic compounds containing chlorine was not emitted from the molten salts. Some by-products comprising benzene rings were found at 773–873 K, but the by-products disappeared at 973 K.
机译：为了构造一种安全，简单和高效的多氯联苯废物处理系统，研究了利用碱性熔融盐分解多氯联苯的方法。将多氯联苯（一，二，三，四，五，六，七氯联苯）溶液注入碱性熔融盐（KOH–K_（2）CO_（3）或NaOH–Na_（2）CO_（3））中–973 K用氧气或仿制空气。利用气相色谱质谱法测定分解后的排气中残留的PCB的质量和在反应容器内冷凝的PCB的质量，求出PCB的分解效率。在某些实验中，还根据废气中PCBs的残留浓度确定了分解效率。无论PCB中包含多少氯，分解效率都很高，在最佳条件下，分解效率高达99.999％。多氯联苯中的氯被捕获在碱性熔盐中，并且熔盐中没有释放出含氯的有机化合物。在773–873 K处发现了一些包含苯环的副产物，但在973 K处却消失了。

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