分壁式萃取精馏分离环己烷-环己烯的模拟与优化

Simulation and optimization of separating cyclohexane and cyclohexene by dividing wall extractive distillation column

使用Aspen Plus化工流程模拟软件,以二甲基亚砜为萃取剂,研究了分壁式萃取精馏过程和双塔萃取精馏过程对环己烷-环己烯混合物的分离。结果表明,2种方法均可实现二者的有效分离,其中分壁式萃取精馏过程得到的环己烷和环己烯质量分数分别为99.53%和99.25%。与双塔萃取精馏过程相比,分壁式萃取精馏过程再沸器热负荷降低3.92%,冷凝器热负荷降低15.26%,可以有效节能。

With dimethyl sulfoxide as extractant,Aspen Plus chemical process simulation software is used to simulate the separation of the cyclohexane/cyclohexene mixture by extractive distillation in a dividing wall column(EDWC） and in a conventional double-column,respectively.The results show that the mixture can be separated effectively by both processes.The mass fractions of cyclohexane and cyclohexene obtained by E-DWC are 99. 53% and 99. 25%,respectively.Compared with extractive distillation in traditional double-column,the heat loads of reboiler and condenser by E-DWC are reduced by 3. 92% and 15. 26%,respectively.Energy saving is realized effectively through E-DWC.