隔离壁萃取精馏塔分离丙烯-丙烷的模拟

Simulation of Divided Wall Extractive Distillation Column for the Separation of Propylene and Propane

提出了采用隔离壁塔分离丙烯-丙烷的新工艺。采用Aspen Plus软件中的MultiFrac模型对其进行了模拟计算。在主塔理论板数55;副塔理论板数11的情况下,利用灵敏度分析模块分析了乙腈含水量、溶剂比、回流比、分配比对分离效果的影响。结果表明,隔离壁萃取精馏塔的适宜工艺条件为:乙腈中含水质量百分数14%;溶剂比5.2;主塔回流比8;分配比4∶1。与常规精馏和常规萃取精馏工艺进行了对比,完成相同的分离任务,该新工艺比常规精馏和常规萃取精馏工艺分别节能39%、20%。

A divided wall column was used to separate propylene and propane. The separation process was sim- ulated by the MultiFrac model of Aspen Plus software. Within the number of theoretical trays of main column 55 and number of theoretical trays of side column 11, the influence of mass fraction of water in acetonitrile, mass ratio of solvent to feed, reflux ratio and distribution ratio on the separation efficiency of the divided wall extractive distil- lation column was analyzed with Sensitivity model. The results showed that the suitable process conditions were the mass fraction of water in acetonitrile 14%, mass ratio of solvent to feed 5.2, reflux ratio of main column 8, distri- bution ratio 4： 1. The separation process was also compared with the conventional distillation and extractive distil- lation technology, and it showed that the novel process could save energy consumption up to 39% and 20%, respectively, in the same separation task.