采用COSMO-RS中的COSMOtherm软件，选定三丁基甲基醋酸铵（[N_{1，4，4，4}][OAc]）作为萃取精馏分离苯和乙醇共沸体系的萃取剂。采用Aspen Plus流程模拟软件，对苯和乙醇体系的萃取精馏过程进行了模拟。考察了溶剂比、全塔理论板数、回流比、原料进料位置等因素对分离效果的影响，通过灵敏度分析，得到了萃取精馏分离乙醇和苯体系的最佳工艺优化条件。在此条件下，产品苯的摩尔分数为99.99%，乙醇的摩尔分数为99.98%。说明以[N_{1，4，4，4}][OAc]为萃取剂萃取分离乙醇和苯的共沸物具有很好的效果。

Through COSMOtherm software in COSMO-RS,ionic liquid tri-butyl-methyl-ammonium acetate ([N_1,4,4,4][OAc]) is selected as the extraction agent to separate the ethanol and benzene azeotrope system.Aspen Plus process simulation software is used to simulate the extractive distillation separation process of benzene and ethanol azeotrope.The effects of the solvent ratio,theoretical plate number in whole tower,reflux ratio,feed position of raw materials and other factors on the separation effect are investigated.The optimum operation parameters for the separation of benzene and ethanol azeotrope are obtained through sensitivity analysis.Under optimal conditions,the mole purity of benzene and ethanol reaches 99.99% and 99.98%,respectively,illustrating that using [N_1,4,4,4][OAC] as the extraction solvent has a good effect on the extractive distillation of ethanol and benzene azeotrope.

李文秀(1963-),男,博士,教授,研究方向为化工分离技术