分子筛合成MTBE反应精馏工艺的模拟和优化

Simulation and optimization of reactive distillation process for synthesizing MTBE catalyzed by zeolite

提出以改性的分子筛作为催化剂合成甲基叔丁基醚(MTBE)的反应精馏工艺。运用Aspen Plus中的Rad Frac模块模拟反应精馏,采用平衡级模型,并且考虑了反应动力学对反应过程的影响,通过优化工艺参数可以有效避免可能发生的副反应。考察了操作压力、反应区/进料位置、回流比、单板持液量以及甲醇补充量对流程的影响。由模拟结果可知,反应精馏异丁烯转化率达到97.1%,MTBE产品质量分数达到99.1%,表明分子筛作为反应精馏催化剂能够得到较高的异丁烯转化率和产品质量分数。

Reactive distillation process is proposed for synthesizing methyl tert-butyl ether （MTBE） catalyzed by modified zeolite.The RadFrac module, which is carried out using equilibrium stage model, is chosen to simulate this process in Aspen Plus and the effect of reaction kinetics on reaction is taken into account.The process parameters can be optimized in order to prevent from occurrence of side reactions. The effects of operation pressure, reaction zone/feed stage, reflux ratio, stage liquid holdup and additional methanol flow rate on the process are investigated.The simulation results show that through reactive distillation, the conversion rate of isobutylene reaches 97. 1% and the mass concentration of MTBE reaches 99.1%.This indicates that reactive distillation catalyzed by modified zeolite can achieve high conversion rate of isobutylene and high purity of MTBE.