分壁式萃取精馏分离乙腈-正丙醇的模拟研究

Simulation of the separation of acetonitrile and n-propanol by extractive distillation in dividing wall column

利用Aspen Plus软件,采用N,N-二甲基甲酰胺作萃取剂,研究了分壁式萃取精馏和常规双塔萃取精馏方法对该混合物的分离,均能实现混合物的有效分离。其中分壁式萃取精馏得到正丙醇和乙腈的质量分数分别为99.12%和99.59%。和常规双塔萃取精馏相比,分壁式萃取精馏流程再沸器热负荷降低11.02%,冷凝器热负荷降低17.69%,实现了有效节能。

Aspen Plus simulation software is used to simulate the separation process of acetonitrile and n-propanol by extractive distillation in dividing wall column（ E-DWC） and in conventional double-column,using N,Ndimethylformamide as extractive agent. The mass fraction of n-propanol and acetonitrile can reach 99. 12% and 99. 59%by E-DWC,respectively. In comparison with extractive distillation in conventional double-column,energy saving of reboiler and condenser using E-DWC are reduced by 11. 02% and 17. 69%,respectively. Energy saving is effectively realized.