四氢呋喃-环己烷二元物系常压汽液平衡数据的测定和关联

摘要

为了常压分离四氢呋喃-环己烷二元物系,利用CE-2型汽液平衡装置测定了四氢呋喃-环己烷二元物系的常压(100 kPa)汽液平衡数据.实验结果表明:四氢呋喃和环己烷形成最低共沸物.实验汽液平衡数据通过了Herington半经验法热力学一致性校验.通过Margules,Van Laar-,Wilson和NRTL活度系数模型对实验数据进行关联和估算,得到了模型的参数值.对模型计算值和实验值进行比较得到汽相摩尔分数和泡点温度的最大绝对平均偏差.通过比较可以看出,Vanlaar和Wilson活度系数模型更适合于四氢呋喃(1)-环己烷(2)二元体系汽液平衡数据的关联.%Isobaric vapor-liquid equilibrium (VLE) data for tetrahydrofuran-cyclohexane system were measured at 100 kPa using CE-2 equilibrium cell in order to separate tetrahydrofuran-cyclohexane system.The results show that tetrahydrofuran and cyclohexane can form a minimum boiling azeotrope.Thermodynamic consistency of the experimental data was confirmed by Herington semiempirical method.The experimental data were correlated using the Margules,Van Laar,Wilson and NRTL activity-coefficient models,in which the binary interaction parameters between the two components were obtained.The average absolute deviation in boiling point and vapor-phase composition were determined by comparing the experimental values with those calculated by the activity coefficient models.According to the comparison result,it can be seen that Van Laar and Wilson models are more suitable for correlating VLE data for tetrahydrofuran and cyclohexane binary system.