萃取精馏分离丙酮-环己烷共沸体系的模拟与实验  

Simulation and experiment of separation of acetone-cyclohexane azeotropic mixture by extractive distillation

作　　者：张波 许松林[1] ZHANG Bo, XU Song-lin(School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, Chin)

机构地区：[1]天津大学化工学院,天津300350

出　　处：《现代化工》2018年第3期218-222,共5页Modern Chemical Industry

摘　　要：利用Aspen Plus对以DMSO为萃取剂的丙酮-环己烷共沸物系的萃取精馏进行了模拟研究。通过灵敏度分析工具,得到了丙酮-环己烷共沸物系的连续萃取精馏最优工艺条件:萃取精馏塔的理论板数36,质量回流比0.32,原料进料位置25,萃取剂进料位置7,萃取剂用量1 750 kg/h,溶剂回收塔的理论板数8,质量回流比0.21,进料位置5时,在最优工艺条件下,分离得到的环己烷质量分数可到99.5%,丙酮质量分数可到99.53%。同时通过间歇萃取精馏,对DMSO作为萃取剂的丙酮-环己烷萃取精馏进行试验验证,通过试验可以得到质量分数为95.35%的环己烷和质量分数为92.24%的丙酮,且二者回收率均可达65%以上,说明以DMSO为萃取剂,通过萃取精馏可以实现丙酮-环己烷共沸物系的有效分离。The continuous extractive distillation of acetone-cyclohexane azeotropic mixture with dimethyl sulfoxide as solvent is simulated by Aspen Plus. By means of sensitivity analysis tools,the optimal conditions for the continuous extractive distillation of acetone-cyclohexane azeotropic mixture are obtained as follows： As for the extractive distillation column,the number of theoretical plate is 36,the mass reflux ratio is 0. 32,the feed position of raw material is on the 25 th plate,the feed position of solvent is on the 7 th plate and the amount of solvent is 1 750 kg·h^（-1）; As for the solvent recovery column,the number of theoretical plate is 8,the mass reflux ration is 0. 21 and the feed position is on the 5 th plate.Under the optimal conditions,99. 5%（ mass fraction） cyclohexane and 99. 53%（ mass fraction） acetone can be gained in the simulation. At the same time,the extractive distillation experiments of acetone-cyclohexane azeotropic mixture using dimethyl sulfoxide as solvent are conducted in a batch extractive distillation mode to test the effectiveness of the separation method.The experimental results show that 95. 35%（ mass fraction） cyclohexane and 92. 24%（ mass fraction） acetone can be obtained by batch extractive distillation,and the mass recovery ratios of both acetone and cyclohexane can surpass 65%. It reflects that extractive distillation using dimethyl sulfoxide as solvent can achieve effective separation of acetone-cyclohexane azeotropic mixture.

关 键 词：共沸物系 萃取精馏 丙酮 环己烷 二甲基亚砜 模拟 

分 类 号：TQ028.4[化学工程]