Effect of Water and Oxygen Contents on the Decomposition of Gaseous Trichloroethylene in Air under Electron Beam Irradiation
Effect of Water and Oxygen Contents on the Decomposition of Gaseous Trichloroethylene in Air under Electron Beam Irradiation
复制标题
电子束辐照下水和氧含量对空气中气态三氯乙烯分解的影响
DOI：
10.1246/bcsj.75.2177
复制
发表时间：
2002
影响因子：
4
通讯作者：
T. Kojima
中科院分区：
文献类型：
--
作者：
T. Hakoda;S. Hashimoto;T. Kojima
采用电子束（EB）处理空气中的三氯乙烯（TCE）气体，作为含氯乙烯废气的净化方法。在大气压、298 K和不同H2O含量的条件下，用1-MeV电子束在气流容器中以10 L/min的速度辐照含TCE（输入浓度为5-75 ppmv，主要在实际废气中检测到）的模型空气。在湿空气中，研究了75 ppmv三氯乙烯在1 × 103 ~ 2.1 × 105 ppmv不同O2浓度下的分解。当H2O和O2含量分别≥ 3 × 102 ppmv和≥ 5 × 103 ppmv时，TCE的分解率提高，TCE分解为83.0 ± 1.5%的二氯乙酰氯（DCAC）和17.5 ± 0.6%的碳酰氯（COCl 2），与TCE的投料浓度无关。在上述空气条件下，5-75 ppmv的三氯乙烯被OH自由基通过Cl-自由基链氧化有效地分解。
An electron beam (EB) treatment of gaseous trichloroethylene (TCE) in air was studied as a purification method of off-gases containing gaseous chloroethylenes. The model air containing TCE at input concentrations of 5–75 ppmv, detected mostly in actual off-gases, was irradiated with 1-MeV EBs in a gas-flow vessel at 10 L/min under the conditions of atmospheric pressure, 298 K, and different H2O contents. The decomposition of 75 ppmv TCE was also examined in humid air under different O2 contents of 1 × 103–2.1 × 105 ppmv. In the existence of H2O and O2 contents with ≥ 3 × 102 ppmv and ≥ 5 × 103 ppmv, respectively, the decomposition ratios of TCE were enhanced and TCE was decomposed into 83.0 ± 1.5% of dichloroacetyl chloride (DCAC) and 17.5 ± 0.6% of carbonyl chloride (COCl2) independently of the input TCE concentrations based on the carbon balance. Trichloroethylene of 5–75 ppmv was effectively decomposed by the OH radical through Cl-radical chain oxidation under the above-mentioned air conditions.