Isobaric Vapor-Liquid Equilibrium for Toluene, 3-Methylthiophene and N-formylmorpholine at 101.33 kPa  

作　　者：李凭力 亓海霞 常贺英 

机构地区：[1]School of Chemical Engineering and Technology,Tianjin University [2]Tianjin Key Laboratory of Membrane Science and Desalination Technology,Tianjin University

出　　处：《Transactions of Tianjin University》2012年第3期224-230,共7页天津大学学报（英文版）

摘　　要：Isobaric vapor-liquid equilibrium (VLE) data were measured for binary mixtures of toluene+N- formylmorpholine, toluene+3-methylthiophene and 3-methylthiophene+N-formylmorpholine at 101.33 kPa. The VLE data of the binary systems were found to be thermodynamically consistent. The saturated vapor pressure calculated by CSGC-PR equation of the pure component had higher accuracy than that calculated by Antoine equation. The liquid- phase activity coefficients of the binary systems were calculated by the Wilson, NRTL and UNIFAC models, and the binary interaction parameters of the three models were determined by the VLE data. The Wilson model was selected as the most suitable model to predict the VLE data of the ternary system of toluene+3-methylthiophene+N- formylmorpholine. The relative volatility between toluene and 3-methylthiophene was also calculated. Moreover, the effect of N-formylmorpholine as solvent was studied. When the molar ratio of solvent to feed (S/F) was 7, the relative volatility reached 1.904, which is almost twice the relative volatility without solvent. Therefore, N-formylmorpholine can be considered as an effective extracting agent for the separation of the close-boiling mixture of toluene+3- methylthiophene by extractive distillation.Isobaric vapor-liquid equilibrium （VLE） data were measured for binary mixtures of toluene＋N- formylmorpholine, toluene＋3-methylthiophene and 3-methylthiophene＋N-formylmorpholine at 101.33 kPa. The VLE data of the binary systems were found to be thermodynamically consistent. The saturated vapor pressure calculated by CSGC-PR equation of the pure component had higher accuracy than that calculated by Antoine equation. The liquid- phase activity coefficients of the binary systems were calculated by the Wilson, NRTL and UNIFAC models, and the binary interaction parameters of the three models were determined by the VLE data. The Wilson model was selected as the most suitable model to predict the VLE data of the ternary system of toluene＋3-methylthiophene＋N- formylmorpholine. The relative volatility between toluene and 3-methylthiophene was also calculated. Moreover, the effect of N-formylmorpholine as solvent was studied. When the molar ratio of solvent to feed （S/F） was 7, the relative volatility reached 1.904, which is almost twice the relative volatility without solvent. Therefore, N-formylmorpholine can be considered as an effective extracting agent for the separation of the close-boiling mixture of toluene＋3- methylthiophene by extractive distillation.

关 键 词：vapor-liquid equilibrium activity coefficient relative volatility 

分 类 号：O642.42[理学—物理化学]