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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。
Aspen Plus simulation software was used to simulate and optimize CO 2 capture production of propylene carbonate distillation. First of all, according to the nature of the system, select the appropriate thermodynamic method and simulation model, and then analyze the components to be separated to determine the appropriate separation sequence, that is, using two-column distillation, the main product propylene carbonate obtained in a Tata kettle, by- Two Tata kettle obtained. Use the DSTWU module in Aspen Plus to determine the initial parameters of the rectification column. Under the initial parameters, the Radfrac module of Aspen Plus was used to calculate the two towers strictly, and the optimum feed temperature and operating pressure were obtained through multiple optimization. Sensitivity analysis was performed with Sensitivity module to get the feed position and reflux Ratio, distillate ratio and other parameters of the optimization results. Finally, the feed temperature of a tower was determined to be 80 ° C, the pressure at the top of the tower was 0.02 MPa, the reflux ratio was 4.26, the number of plates was 22 and the feed position was the 9th plate. The feed temperature of the two towers was 25 ° C, The pressure is 1 MPa, the reflux ratio is 1.47, the plate number is 21 and the feed position is the 12th plate, which improves the operation level of the rectification column, reduces the energy consumption and reduces the production cost.