Previous reports on the thermal or CO2-laser induced decomposition of trichloroethylene have identified only one condensible product, hexachlorobenzene (in addition to HCl and mono- and dichloroacetylene). We have found that trichloroethylene vapor exposed to cw irradiation on the P(24) line of the (001 - 100) band of the CO2 laser at incident power levels from 8 - 17 W produces numerous products, of which the 13 major ones have been identified using IR, GC/MS, GC/FTIR, and NMR methods. All of these products have 4, 6, or 8 carbons, are highly unsaturated, and are completely chlorinated or contain a single hydrogen. C4HCl5 and C6Cl6 isomers (three of each) account for S 55% to 85% of total products (based on peak areas in the total ion chromatograms in GC/MS runs), depending on reaction conditions. In addition to characterizing the products, we discuss the dependence of the product distribution on laser power, irradiation time, and cell geometry, and we outline a possible mechanism.
之前有关
三氯乙烯热解或CO
2-激光诱导热解的报告只鉴定了一种可凝结产物——
六氯苯(除了HCl和单-双
氯乙炔)。我们发现,在CO
2激光(001-100)带的P(24)线上连续辐射8-17 W的入射功率下,
三氯乙烯蒸气会产生众多产物,其中13种主要产物已通过IR、GC/MS、GC/FTIR和NMR方法鉴定。所有这些产物都含有4、6或8个
碳,高度不饱和,完全
氯化或含有一个
氢。C
4HCl
5和C
6Cl
6异构体(每种三个)占总产物的55%至85%(基于GC/MS运行中总离子色谱峰面积),具体比例取决于反应条件。除了表征产物外,我们还讨论了产物分布与激光功率、辐射时间和反应器几何形状之间的关系,并概述了可能的反应机理。