三元——假二元系的过量体积

THE EXCESS VOLUMES OF TERNARY——PSEUDOBINARY MIXTURES

提出测量三元——假二元系(1-x)[(1-y)A+yC]+z[(1-y)B+yC]的过量热力学函数的方法,测量了在298.15K下两种假二元系:A=环己烷,B=苯,C=甲苯,甲基环己烷的过量体积V^E,用van der Waals单流体模型对实验结果进行了讨论。

A method for the measurement of excess thermodynamic functions of ternary—— pseudobinary liquid mixtures (1-x)[(1-y)A+yC]+x[(1-y)B+yC] has been proposed. The excess volumes of two systems A=cyclohexane, B=benzene, C=toluene or methylcyclohexane have been measured at 298.15K. Using vdW one-fluid approximation and the classical van der Waals equation, the vdW parameters of pure fluids have been evaluated by the least squares method from the V^E data of binary system. Moreover, the excess volumes of pseudobinary system can be calculated with appropriate vdW parameters of pure fluids. It has been found that the calculated values are in fairly good agreement with the experimental results.