噻吩-甲苯、乙硫醚-甲苯二元体系汽液平衡

Isobaric Vapor-liquid Equilibrium of Binary Systems Containing Thiophene-Toluene,Diethyl sulfide-Toluene

用新型泵式沸点仪测定了101.325 kPa下噻吩-甲苯、乙硫醚-甲苯2个二元系在不同液相组成时的沸点,用过量自由能函数Q,采用间接法由Tpx推算了2个二元系的汽相平衡气相组成y。2个二元体系活度系数分别用Wilson模型、NRTL模型、Margules模型和Van Laar模型进行关联,用最小二乘法求出了它们的液相活度系数模型参数。用所得的液相活度系数来计算此二元体系的过量吉布斯自由能函数GE/RT。用2个二元系模型参数对所测的数据进行关联,建立该系统汽液平衡的热力学模型并计算平衡时的泡点温度。计算的泡点与实验的沸点吻合良好,由面积积分法检验这些模型参数计算的2个二元体系相平衡数据得到很好的热力学一致性。

Isobaric vapor-liquid equilibrium （VLE） data at 101. 325 kPa for the two binary systems containing thiophene-toluene, diethyl sulfide-toluene were determined by different liquid phase compositions using a novel pump-ebullionmeter. The vapor-phase composition y had been calculated from Tpx by the indirect method according to the Q function of molar excess Gibbs energy. The activity coefficients were correlated with the Wilson, NRTL, Margules and van Laar models through the least square method based on the experimental T-x data. The activity coefficients are useful to calculate excess Gibbs function （GE/RT） for the two binary systems. The VLE data of the two binary systems were correlated based on the resulted model parameters in order to build the thermodynamic model of VLE for these systems and obtain the calculated bubble points. The calculated bubble points with the model parameters of activity coefficients were in good agreement with the experimental boiling points. The thermodynamic consistency of the experimental data for the two binary systems was checked by area test method and was satisfactory