分壁式萃取精馏塔制取无水正丙醇的实验与模拟研究

Experiment and Simulation Study on Extractive Distillation of Anhydrous n-Propyl Alcohol by Dividing Wall Column

采用分壁式萃取精馏塔制取无水正丙醇,以乙二醇为萃取剂,在溶剂比为3、主塔回流比为2.5时,实验测得塔顶正丙醇的质量分数达到96.03%,塔釜乙二醇的质量分数达到99.44%,可作萃取剂直接循环利用。利用Aspen Plus对该工艺进行模拟计算,其结果与实验基本一致。模拟对比该工艺和常规双塔萃取精馏工艺,结果显示分壁式萃取精馏塔节能22.5%,降低了能耗和设备投资。

A dividing wall column was applied in extractive distillation in order to gain anhydrous n-propyl alcohol with ethanediol as extractant.When the solvent ratio was 3, the reflux ratio of main column was 2.5, the mass fraction of n-propyl alcohol in the top product was 96.03%, the mass fraction of ethanediol in the bottom product was 99.44% and it could be recycling used as extraction solvent.It showed that the experiment results were basically in agreement with the simulation results obtained by Aspen Plus. The DWC column could reduce energy by 22.5% compared with conventional extractive distillation process, the equipment cost and energy consumption could also be reduced.