研究论文
向波涛,王涛,沈忠耀.乙醇废水的超临界水氧化反应路径及动力学研究[J].环境科学学报,2002,22(1):21-23
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
- 关键词：超临界水氧化法(SCWO) 乙醇 废水 反应路径 动力学
- 基金项目：
- 作者
- 单位
- 向波涛
- 清华大学化工系, 北京 100084
- 王涛
- 清华大学化工系, 北京 100084
- 沈忠耀
- 清华大学化工系, 北京 100084
- 摘要：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3.51×105J·mol-1和7.74×1021s-1.方程计算值和实验值吻合较好,误差基本在10%以内.
- Abstract：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 3.51×105 J·mol-1,and the Arrhenius preexponential factor was 7.74×1021 s-1.The deviation between calculated and experimental results was approximately within 10%.
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