滑动弧电极放电等离子体作用甲烷制C2烃的工艺

采用刀片式不锈钢电极放电反应器,以Ar气为稀释气,研究了等离子体作用下甲烷转化制C2烃的工艺条件。考察了CH4流量、高频电源输入电压和电极间距等参数对甲烷转化率、C2烃选择性、收率和反应表观能耗的影响。结果表明,增加CH4流量,表观能耗随之降低;当输入电压和电极间距较小时,甲烷转化率随输入电压和电极间距的增大而增大,但输入电压和电极间距过大时,C2烃收率明显下降,积碳严重。在CH4流量14 mL/min、Ar气流量60 mL/min、高频电源输入电压22 V、电流0.44 A、电极间距4 mm的优化条件下,甲烷最高转化率为43.1%,C2烃收率、选择性和表观能耗分别为40.1%、93.2%和2.41 MJ/mol。C2烃中不饱和烃的体积分数可达95%以上。

Process for Conversion of Methane to C2 Hydrocarbons in Gliding Arc Discharge Plasma Reactor

Methane conversion in gliding arc discharge plasma has been studied. The focus of this research is to develop a process of converting methane to C2 hydrocarbons. The influences of CH4 flow rate, input voltage and electrode gap on methane conversion were investigated. The results show that the apparent energy requirement(AER) is obviously increased by enhancing CH4 flow rate. The conversion of methane is improved by adjusting input voltage or electrode gap. And when the input voltage or electrode gap is large, the yield for C2 hydrocarbons decreases significantly. The unsaturated hydrocarbons are the main products of C2 hydrocarbons. Optimum conditions for producing C2 hydrocarbons from methane are suggested. A maximum methane conversion of 43.1% is obtained under the optimum conditions. Also, the selectivity and yield for C2 hydrocarbons and AER are 40.1%, 93.2% and 2.41 MJ/mol, respectively.