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首页> 外文期刊>Environmental Science & Technology >Pyrolysis study of halogen-containing aromatics reflecting reactions with polypropylene in a posttreatment decontamination process
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Pyrolysis study of halogen-containing aromatics reflecting reactions with polypropylene in a posttreatment decontamination process

机译：后处理去污工艺中含卤素芳烃热解反应与聚丙烯反应的研究

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摘要

Halogen-containing aromatics, mainly bromine-containing phenols, are harmful compounds contaminating pyrolysis oil from electronic boards containing halogenated flame retardants. In addition, their formation increases the potential for evolution of polybrominated dibenzo-p-dioxins (PBDDs) and dibenzofurans (PBDFs) at relatively low temperature (up to 500 degrees C). As a model compound, 2,4-di bromo phenol (DBP) was pyrolyzed at 290-450 degrees C. While its pyrolysis in a nitrogen flow reactor or in encapsulated ampules yields bromine-containing phenols, phenoxyphenols, PBDDs, and PBDFs, pyrolysis of DBP in a hydrogen-donating medium of polypropylene (PP) at 290-350 degrees C mainly results in the formation of phenol and HBr, indicating the occurrence of a facile hydrodebromination of D13P. The hydrodebromination efficiency depends on temperature, pressure, and the ratio of the initial components. This thermal behavior of DBP is compared to that of 2,4-dichlorophenol and decabromodiphenyl ether. A treatment of halogen-containing aromatics with PP offers a new perspective on the development of low-environmental-impact disposal processes for electronic scrap.
机译：含卤素的芳族化合物，主要是含溴的苯酚，是有害化合物，会污染含有卤化阻燃剂的电子板上的热解油。此外，它们的形成增加了在相对较低的温度（最高500摄氏度）下多溴化二苯并对二恶英（PBDD）和二苯并呋喃（PBDF）的释放潜力。作为模型化合物，将2,4-二溴苯酚（DBP）在290-450摄氏度下热解。将其在氮气流反应器或封装的安瓿中热解时，会生成含溴的苯酚，苯氧基苯酚，PBDDs和PBDF，进行热解。在290-350摄氏度下，聚丙烯（PP）的供氢介质中DBP的形成主要导致苯酚和HBr的形成，表明D13P的加氢脱溴很容易发生。加氢溴化效率取决于温度，压力和初始组分的比例。将DBP的这种热行为与2,4-二氯苯酚和十溴二苯醚的热行为进行了比较。用PP处理含卤素的芳香族化合物为电子废料低环境影响处理工艺的发展提供了新的视角。

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