甲醇气相脱水制二甲醚本征动力学研究

摘要

在温度240～340℃、压力0.1～1.0 MPa、液体体积空速0.9～4.0 h-1的等温积分反应器中,催化剂为甲醇脱水MD-2型催化剂,研究了甲醇脱水生成二甲醚的本征动力学,并考察了操作条件对甲醇转化率的影响。实验结果表明：随着温度的升高,甲醇转化率先升高后降低;压力的变化对甲醇转化率的影响不大;随着空速的增加,甲醇转化率逐渐降低。根据实验测定数据,应用参数估值方法,依据不同反应机理推导出以各组分逸度表示的4种双曲型动力学方程,残差分析及统计检验表明,基于Langmuir-Hinshelwood解离吸%The intrinsic kinetics of methanol dehydration to dimethyl ether and the effect of operation conditions on the conversion of methanol were carried out in an isothermal integral fixed bed reactor over catalyst MD-2.The experiments were performed on the temperature 240～340 ℃,pressures 0.1～1.0 MPa,and liquid space velocities 0.9～4.0 h-1.The results indicate that the methanol conversion first increases then decreases with increasing temperature;the pressure has little effect on the methanol conversion;the methanol conversion decreases with increasing space velocity.Four kinds of kinetic models expressing with each component＇s fugacity are established based on different reaction mechanism and by parameter estimation method according to the experimental data.The analysis of residual error and statistic test show that the intrinsic kinetic equation based on the mechanism of Langmuir-Hinshelwood dissociation adsorption is reliable.