Abstract: The ETDF-PR equation of state proposed in Part( I )of this work was extended to the vapor-liquid equilibria of mixtures. A comprehensive mixing rule and fugacity coefficient expression were proposed, which can be simplified into different versions for the specific systems. Binary and ternary VLE for nonpolar-nonpolar, nonpolar-polar, polar-polar systems (mainly alcohol-containing systems) at moderate and high pressures were calculated with satisfactory accuracy. Moreover, a method to handle the supercritical component for the ETDF-PR equation was presented, and used for hydrogen-containing systems successfully. In conclusion, a practical procedure for describing VLE for complex systems was suggested in this work. Apparently, this procedure can be applied to the process development for the separation of the higher alcohols and other real systems.

摘要： 本文将前文(I)报中提出的实用温度函数型PR方程推广到了流体混合物.根据前人工作,提出了一个总括性的混合规则,针对不同体系可得到其简化形式.非极性-非极性,非极性-极性,极性-极性体系,尤其是含醇体系的低、高压下的二元及三元汽液相平衡计算表明,本文的模型有较广的适用性.此外还提出了处理超临界组分的方法,较准确地推算了含氢系统的汽液平衡.总之,本文提出的一套描述复杂体系汽液平衡的方法,可望用于指导低碳酸及其他工业实际体系的分离过程开发.