PCB destruction: A novel dehalogenation reagent
PCB destruction: A novel dehalogenation reagent
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PCB破坏：一种新型脱卤试剂
DOI：
10.1016/0304-3894(85)85004-4
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
C. Rogers
中科院分区：
文献类型：
--
作者：
Alfred Kornel;C. Rogers
位于俄亥俄州辛辛那提的美国环境保护署工业环境研究实验室正在研究碱金属聚乙二醇复合物（APEGs）作为含有多氯联苯和其他卤代有机物的土壤原位去污试剂。APEG试剂可以与碱金属或氢氧化物以及相应的聚乙二醇或聚乙二醇单烷基醚一起配制。发现这些碱性PEG对卤化有机物非常反应性，特别是在升高的温度下（约100 ℃）。60-100°C），并已应用于Transformer油中多氯联苯的去污。主要产物是碱金属卤化物，即，在多氯联苯和聚乙二醇醚芳烃的情况下，氯化钠。反应机理为卤碳键上的亲核取代。反应性APEG物质理论上是冠醚金属配位结构。这些APEG的先前制剂需要碱金属与所需聚乙二醇在无水条件下反应。这些制剂非常容易被水分解，并且脱卤速率同样大大降低。本工作考察了APEG浓度和稀释度对Aroclor 1242和1260脱卤的影响，并将其应用于土壤中PCBs的原位降解。
Alkali metal polyethylene glycolate complexes (APEGs) are being investigated as reagents for thein-situdecontamination of soils containing PCBs and other haloorganics in the U.S. Environmental Protection Agency's Industrial Environmental Research Laboratory, Cincinnati, Ohio. APEG reagents can be formulated with either an alkali metal or hydroxide and the corresponding polyglycol or polyglycol monoalkyl ethers. These alkali PEGs were found to be very reactive toward halogenated organics, particularly at elevated temperatures (ca. 60–100°C) and have been applied for decontamination of PCBs in transformer oils. The primary products were an alkali metal halide, i.e., sodium chloride in the case of PCBs and polyglycol ether aromatics. The reaction mechanism is nucleophilic substitution at the halogen-carbon bond. The reactive APEG species is theorized to be a crown ether metal coordinated structure. Previous formulation of these APEGs required reaction of the alkali metals with a desired polyethylene glycol under anhydrous conditions. These formulations were very susceptible to decomposition by water, and dehalogenation rates were likewise vastly reduced. Recent studies have shown that this is not an insurmountable problem when APEGs are formulated with the alkali metal hydroxide.This work examines the effect of APEG concentration and dilution in water and organic solvent on the dehalogenation of Aroclors 1242 and 1260 with potential application for thein-situdestruction of PCBs in soils.