含离子液体苯-甲醇物系等压气液相平衡  

Isobaric vapor-liquid equilibrium for benzene-methanol system containing ionic liquid

作　　者：丁忠瀚 李文秀 张弢 DING Zhong-han;LI Wen-xiu;ZHANG Tao(Key Laboratory of Chemical Separation Technology of Liaoning Province,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning Province,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：《化学工程》2021年第3期28-32,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21576116)。

摘　　要：在常压下测定了苯+甲醇+三辛基甲基醋酸铵([N_(1,8,8,8)][OAc])三元物系的等压气液相平衡数据。实验结果表明:[N_(1,8,8,8)][OAc]的加入可以显著提高苯对甲醇的相对挥发度,当[N_(1,8,8,8)][OAc]的摩尔分数为0.08时共沸现象完全消失。分别采用Wilson和NRTL热力学模型对该气液相平衡数据进行关联,通过计算得到方程参数。Wilson模型和NRTL模型均适用于该系统,NRTL模型的计算结果与实验数据的偏差最小。由NRTL模型计算出[N_(1,8,8,8)][OAc]打破苯-甲醇体系共沸的最小摩尔分数为0.076。因此[N_(1,8,8,8)][OAc]可以用作分离苯-甲醇共沸体系的萃取剂。The isobaric vapor-liquid equilibrium(VLE)data of the ternary system of benzene+methanol+trioctyl methyl ammonium acetate([N_(1,8,8,8)][OAc])were measured at 101.3 kPa.The relative volatility of benzene to methanol was significantly enhanced with the addition of[N_(1,8,8,8)][OAc].When the mole fraction of[N_(1,8,8,8)][OAc]was 0.08,the azeotropic phenomenon of benzene-methanol system disappeared completely.The NRTL and Wilson models were used to correlate the VLE data,and the equation parameters were obtained by calculation.The NRTL and Wilson models were applicable to the benzene-methanol system,and the calculated results by the NRTL model had the minimum deviation from the experimental data.The calculation results of the NRTL model show that the minimum mole fraction of[N_(1,8,8,8)][OAc]for eliminating the azeotropic point of benzene-methanol system is 0.076.Therefore,[N_(1,8,8,8)][OAc]can be used as an entrainer for the extractive distillation the benzene-methanol azeotrope system.

关 键 词：苯 甲醇 气液相平衡 离子液体 热力学模型 

分 类 号：TQ021.2[化学工程]