甲醇在耐高温磺酸树脂催化下的脱水反应动力学

为了开发反应精馏合成二甲醚新工艺,实验在2MPa(G)、120℃～155℃、初始甲醇摩尔分数100%～30%、液空速0.10mL/(min·g催化剂)～0.15mL/(min·g催化剂)条件下,以耐高温磺酸树脂作催化剂,在等温积分反应器内,系统地测定了甲醇脱水生成二甲醚的反应动力学数据。分别用L-H及E-R模型建立了反应动力学方程,并对实验数据进行了拟合。拟合结果表明:在实验范围内,按E-R模型拟合的反应动力学方程与实验结果更吻合。通过对动力学方程进行分析,发现随着反应温度的升高以及甲醇活度与水活度比值的增大,甲醇脱水反应速率都会增大。实验工作可为开发反应精馏合成二甲醚新工艺提供重要的反应动力学数据。

Dehydration Kinetics of Methanol Catalyzed by High Temperature Resistant Sulfonic Resin

In order to develop the new catalytic distillation process of dimethyl ether synthesis, the dehydration kinetics of methanol over high temperature resistant sulfonic resin were systematically measured in an isothermal integral reactor with initial methanol molar fraction between 100%-30% and liquid space velocity of 0.10-0.15mL/（min.g catalyst） at the pressure of 2MPa and temperatures from 120℃ to 155℃. The kinetic equations were established with L-H mechanism and E-R mechanism, respectively. The correlated results showed that E-R mechanism agreed well with the experimental data. It was found from the kinetic equation that the reaction rate would be accelerated as temperature, the ration of methanol activity and water activity increased. Experimental work provides important kinetic data for developing the catalytic distillation process of dimethyl ether synthesis.