采用萃取精馏工艺对甲醇和丙酸甲酯二元共沸物进行分离，筛选出以苯酚为萃取剂，借助Aspen Plus软件对该过程进行模拟研究，通过单因素优化详细考察了两塔的理论板数、进料位置、回流比以及溶剂比等工艺参数对塔顶产品质量分数和再沸器能耗的影响，确定了较优的工艺参数：萃取精馏塔理论板数32块，待分离原料进料位置第16块，萃取剂进料位置第6块，回流比为1.4，溶剂比为1.3，塔顶甲醇产品质量分数为99.9%；溶剂回收塔理论塔板数24，进料位置第6块，回流比为1.3，塔顶丙酸甲酯产品质量分数为99.9%。在上述模拟优化基础上，进一步通过实验验证了萃取精馏工艺的可行性。最后对某公司5 600 t/a的丙酸甲酯和甲醇混合液进行工程设计，为该二元共沸物的分离提供依据。

Methyl propionate-methanol binary azeotrope is separated by using extractive distillation process with phenol being screened as an extractant.The separation process is simulated through steady state Aspen Plus software.The effects of theoretical plate numbers,feed locations,reflux ratios and solvent ratios of both towers on the mass content of tower-top products and the energy consumption of reboilers are analyzed in detail through single factor optimization.The optimal parameters for the extractive distillation tower are obtained as follows:number of theoretical plate is 32,azeotrope is fed at the 16th plate,phenol is fed at the 6th plate,reflux ratio is 1.4,solvent ratio is 1.3 and the mass fraction of methanol at the top of tower can reach 99.9%.The optimal parameters for the solvent recovery tower are as follows:number of theoretical plate is 24,feed is at the 6th plate,reflux ratio is 1.3 and the mass fraction of methyl propionate at the top of tower can reach 99.9%.Moreover,this continuous extractive distillation process is verified to be feasible through experiments based on the simulation and optimization.Finally,the engineering design for a company's 5 600 ton/year methyl propionate-methanol mixture separation process is carried out,which can supply basis for separation of binary azeotrope.

韩淑萃(1984-),女,硕士,讲师,研究方向为化工传质与分离