酯交换法合成碳酸二甲酯的催化精馏过程研究

在催化精馏实验装置中 ,以等体积浸渍法负载于是碳分子筛上的 12 磷钨酸为催化剂 ,通过碳酸丙烯酯和甲醇之间的酯交换反应合成碳酸二甲酯。通过实验考察了原料配比、操作压力、回流比、处理量等工艺参数对催化精馏过程的影响。采用神经网络与遗传算法相结合的方法 ,用黑箱模型计算催化精馏过程 ,并进行了全局优化 ;以动力学模型为基础 ,借助ASPEN软件用平衡级模型进行了催化精馏过程的模拟与预测。

Preparation of Dimethyl Carbonate through Transesterification in a Catalytic Distillation Column

In a catalytic distillation column,dimethyl carbonate (DMC) was prepared through transesterification between methanol and propylene carbonate using 12 phosphotungstic acid supported on carbon molecular sieves as heterogeneous catalyst.The effecting factors of operational pressure,molar ratio in feed streams,reflux ratio,and throughput on propylene carbonate conversion were experimentally investigated,and the appropriate operational conditions were obtained.A method,which combined neural network and genetic algorithms,was employed to simulate the catalytic distillation process by black box model and optimize the operational parameters.ASPEN software was chosen to simulate and predict the temperature,concentration and other profiles of the catalytic distillation column by equilibrium stage mode.