非平衡等离子体消除乙硫醇

Removal of ethanethiol by nonequilibrium plasma

采用脉冲电晕放电等离子体对乙硫醇进行消除实验,探索了气体流量(停留时间)、气流中水分含量对消除率的影响规律。结果表明,随着气体流量的增大,乙硫醇在反应器内的停留时间减小,能量密度减小,消除率降低;消除率随水分含量的变化并非呈单方向增大或减小,而是存在一个最佳范围,从实验结果来看,水分含量为3.2～3.5g/m3,消除率明显高于水分含量低于3.2g/m3或高于3.5g/m3时的消除率。采用GC-MS、FTIR和SGA94-SO2型单项气体分析仪等仪器对乙硫醇的消除产物进行了分析,主要产物为CO2、H2O和SO2,未检测到有机产物。根据实验数据分析了乙硫醇的反应动力学特征,发现乙硫醇在脉冲电晕等离子体体系中的反应符合一级反应动力学特征,反应速率常数为0.0729s-1。

Pulsed corona discharge plasma was used to treat ethanethiol in the air. The influences of gas flow rate （or residence time） and moisture of gas flow on removal efficiency were investigated. As a result, the removal efficiency decreased obviously with increasing gas flow rate, because both the residence time of ethanethiol in plasma reactor and energy density decreased. While the variation of removal efficiency with moisture on removal efficiency was not increasing or decreasing unilaterally, and the maximal removal efficiency could be obtained in a range of moisture. The removal efficiency in the moisture range of 3.2-3.5 g/m^3 was obviously higher than that at a moisture of less than 3.2 g/m^3 or more than 3.5 g/m^3 according to experimental data. The products of ethanethiol reaction were mainly CO2, H2O and SO2 analyzed by GC-MS, FTIR and SGA94-SO2 Single Gas Analyzer, but no organic product was found. According to analyzing the reaction kinetic characteristics of ethanethiol based on experimental data, it was found that the reaction of ethanethiol in pulsed corona plasma system followed the first order reaction, with the reaction rate constant of 0.0729 s^-1.