Abstract: An effective temperature dependent function for the a expression was used to modify the Peng-Robinson equation. The ETDF-PR equation was used for vapor-liquid equilibria calculations for 52 pure substances, including non-polar, quantum, and polar fluids. The calculated vapor pressures were compared with those from several conventional equations of state. The results showed that this work is a good improvement, in particular, for the polar fluids and the higher alcohols of interest.

摘要： 本文在对立方型状态方程的详细分析基础上,采用一种实用的与温度有关的a函数表达式,修正了Peng-Robinson状态方程式.用其计算包括非极性,极性和量子流体的52种性质广泛的纯物质,特别是低碳醇混合物中各组分的饱和蒸汽压,获得了令人满意的结果.与多种常见的状态方程式相比较,尤其是对极性流体,本文有明显改进.