分子筛催化合成甲基叔丁基醚反应宏观动力学

在改性β分子筛液相催化异丁烯与甲醇合成甲基叔丁基醚反应本征动力学的基础上 ,考察了催化剂粒度变化对反应的影响 ,建立了宏观动力学方程。用最小二乘法和数值积分法对动力学试验数据进行拟合 ,得到有效扩散系数Def=1 8× 10 - 8exp-1914 1/(RT) ] ,并将异丁烯转化率实验值与由宏观动力学方程的计算值相比较。结果表明 ,所建立的宏观动力学方程能很好地描述存在内扩散影响的分子筛液相催化醚化反应过程。并采用模型方程预测了反应条件和催化剂粒度对醚化反应结果的影响

Macro-Kinetics of Methyl tert-Butyl Ether Synthesis over Zeolite

The liquid phase synthesis of methyl tert-butyl ether(MTBE) from methanol and isobutylene was studied experimentally in a fixed-bed reactor over modified β zeolite catalyst and a macroscopic kinetics model was developed on the basis of the intrinsic kinetics model presented in an earlier work.The influence of catalyst particle size on MTBE synthesis was taken into account in the macro-kinetics model.The diffusion rate of isobutylene Def=1.8×10-8exp (-19141 /RT) was obtained by regression method and numerical integration of experimental data.A comparison between model predictions and experimental data shows that this model fits the experimental data well.The influence of reaction conditions and catalyst particle size on etherification can be forecasted with the macro-kinetics model.