CO_2捕集生产碳酸丙烯酯分离工段的模拟优化  

Simulation and optimization of separation process of propylene carbonate from CO_2

作　　者：李瑞端[1] 戴传波[1] 李广顿 王佳楠[1] 

机构地区：[1]吉林化工学院石油化工学院,吉林吉林132022

出　　处：《现代化工》2016年第12期171-174,共4页Modern Chemical Industry

摘　　要：利用Aspen Plus模拟软件对CO_2捕集生产碳酸丙烯酯精馏工段进行模拟优化。首先根据物系性质选取合适的热力学方法和模拟模型,再对待分离组分进行分析,确定合适的分离序列,即采用双塔精馏,主要产品碳酸丙烯酯在一塔塔釜获得,副产品丙二醇在二塔塔釜获得。运用Aspen Plus中的DSTWU模块,确定精馏塔的初始参数。在初始参数下,利用Aspen Plus的Rad FRac模块对两塔进行严格计算,并通过多次优化得到合适的进料温度、操作压力;利用Sensitivity模块进行灵敏度分析,得到两塔的进料位置、回流比、馏出比等参数的优化结果。最终确定一塔的进料温度为80℃、塔顶压力为0.02 MPa回流比为4.26、塔板数为22、进料位置为第9块板;二塔的进料温度为25℃、塔顶压力为1 MPa、回流比为1.47、塔板数为21、进料位置为第12块板,提高了精馏塔的操作水平,减少能耗,降低了生产成本。The separation process of propylene carbonate from CO2 and propylene oxide is simulated by using Aspen Plus software. The separation process is calculated and studied by selecting the appropriate simulation model and thermodynamic method according to the operation features and physical and chemical properties of the raw materials. The main operation parameters are studied by using sensitivity analysis tools in Aspen Plus. The simulation results show that all of the parameters can reflect the operation process very well. The optimized parameters are shown as follows： for the first column,80℃ of feed temperature,0. 02 MPa of top pressure,4. 26 of reflux ratio,22 of the plate number,the 9-（th） plate of the feeding position; for the second column,25 ℃ of the feed temperature,1 MPa of top pressure,1. 47 of reflux ratio,21 of the plate number,the 12 thplate of the feeding position. The steady-state simulation of the distillation column has an influence on improving the level of operation,increasing production,reducing energy consumption and conserving resource.

关 键 词：碳酸丙烯酯 精馏 模拟 优化 

分 类 号：TQ028[化学工程]