三辛基甲基醋酸铵离子液体作为夹带剂分离甲苯和乙醇的共沸混合物  

Separation of ethyl acetate and ethanol azeotrope mixture using dialkylphosphates-based ionic liquids as entrainers

作　　者：熊儒风 潘成桥 张弢 XIONG Rufeng;PAN Chengqiao;ZHANG Tao(Key Laboratory of Chemical Separation Technology Liaoning Province,Shenyang University of Chemical Technology,Shenyang Liaoning 110142,China)

机构地区：[1]沈阳化工大学辽宁省化工分离技术重点实验室,辽宁沈阳110142

出　　处：《山西化工》2021年第1期5-7,17,共4页Shanxi Chemical Industry

基　　金：国家自然科学基金项目(21576116)。

摘　　要：通过COSMOthermX软件筛选出萃取精馏的萃取剂为三辛基甲基醋酸铵盐[N8,8,8,1][OAC];测定了常压下甲苯+乙醇的二元气液相平衡数据及甲苯+乙醇+三辛基甲基醋酸铵盐的三元气液相平衡数据,使用非随机双液体(NRTL)模型拟合实验数据。结果表明,三辛基甲基醋酸铵盐离子液体具有打破共沸的能力,实现甲苯-乙醇共沸物的分离。[N8,8,8,1][OAC]的加入对乙醇有显著的盐析效应。当离子液体的摩尔分数逐渐增加时共沸点向下移动,直到共沸物被完全消除。由NRTL模型计算得到[N8,8,8,1][OAC]的最小打破共沸的摩尔分数为0.1032。实验结果表明,本研究选用的[N8,8,8,1][OAC]能够作为分离甲苯-乙醇共沸体系的萃取剂。The ionic liquid(3-octyl-methyl ammonium acetate[N8,8,8,1][OAC])were selected by COSMOthermX software as suitable extractant.Isobaric vapor-liquid equilibrium(VLE)data of the toluene-ethanol system and containing ionic liquid(IL)were predicted by COSMOthermX.The nonrandom two-liquid(NRTL)model were adopted to correlate the VLE data.The addition of[N8,8,8,1][OAC]has a significant salting-out effect on ethanol.When the mole fraction of the ionic liquid gradually increases,the azeotropic point moves downward until the azeotrope is completely eliminated.The minimum azeotropic breaking mole fraction of[N8,8,8,1][OAC]calculated by the NRTL model is 0.1032.The result shows that[N8,8,8,1][OAC]selected in this study can be used as the extractant for the separation of toluene-ethanol azeotropic system.

关 键 词：甲苯 乙醇 离子液体 气液相平衡 NRTL模型 

分 类 号：TQ028[化学工程]