乙醇废水的超临界水氧化反应路径及动力学研究

Study on the reaction pathway and kinetics of ethanol wastewater disposal by supercritical water oxidation

研究了超临界水氧化法 (SCWO)处理乙醇废水过程的反应路径和动力学 .乙醇SCWO反应的最终产物为CO2 ,CO是此过程的中间产物 .以幂指数方程描述乙醇SCWO反应动力学 ,得到对于乙醇的反应级数为 1,对氧气的反应级数为 0 .求出活化能和指前因子分别为 3 5 1× 10 5J·mol-1和 7 74× 10 2 1s-1.方程计算值和实验值吻合较好 ,误差基本在 10

Ethanol was oxidized in supercritical water in an isothermal,plug\|flow reactor.The experimental variables included temperatures varying from 475 to 550℃,pressures varying from 22 to 30MPa,reactor residence time varying from 0\^6 to 98\^3s,and oxygen/ethanol molar feed ratios varying from 4\^56 to 9\^09.The experimental results showed that carbon monoxide was the major intermediate in the oxidation of ethanol in supercritical water. The global kinetics for ethanol disappearance was described by a rate law that was first order in ethanol and zero order in oxygen.The activation energy was 3\^51×10 5 ?J·mol -1 ,and the Arrhenius pre\|exponential factor was 7\^74×10 21 ?s\+\{-1\}.The deviation between calculated and experimental results was approximately within 10%.