碳酸乙烯酯水解法制乙二醇精馏单元的Aspen Plus模拟研究

Aspen Plus Simulation Studies of Distillation Unit to Produce Ethylene Glycol by Ethylene Carbonate Hydrolysis Method

利用化工流程模拟软件Aspen Plus对25万t乙二醇项目精馏单元进行模拟,选用WILSON、UNIQUAC、NRTL 3种物性方法,用DSTWU模块进行简捷计算,比较后得出NRTL物性方法最优;然后采用NRTL物性方法,用Rad Frac模块进行严格计算,并与简捷计算结果比较,表明物性方法模拟可信;最后,对精馏塔的操作变量进行灵敏度分析,得到T0501和T0502最佳进料位置、回流比、D∶F分别7、0.13、0.13和11、0.67、0.97。

Distillation unit was simulated to produce 25 x 10^4 t/a ethylene glycol, Using chemical process simulation software Asp-en Plus. First of all, The simple calculation was made using the DSTWU module with three methods of physical propertiy of WIL-SON, UNIQUAC and NRTL. After comparing, NRTL optimal was obtained. Then, strict calculation was made using RadFrac mod-ule with physical property of NRTL, the simulated was a trusted property method after compared with the simple calculation. Fi-nally, feed position,reflux ratio,D/F of water column and ethylene glycol distillation column were 7,0.13,0.13 and 11,0.67,0.97 by the sensitivity analysis to the operation of the rectification column variables.