【摘要】 本文提出了一个改进的 Van Der Waals (VDW) 型状态方程p=RT/(v-b)-aa(T)/(v+mb)(v-nb)其中m,n是偏心因子ω的函数,a(T)是温度和临界压缩因子的函数。检验结果表明:本方程一般都比 RKS 方程和 PR 方程精度要高,对某些物质则和这两个方程相当,对液相体积的计算精度提高尤为明显。最后,本文还提出了相应的混合规则。更多还原

【Abstract】 In this paper, a modified cubic equation of state is proposed:Where m and n are the functions of acentric factor, a(T) is a dimensionless function of reduced temperature and critical compressibility factor. Examples of use of the equation for predicting the fugacity and volumetric behavior of pure substances are given. The proposed equation combines simplicity and accuracy. It performs as well as or better than EKS equation and PE equation in all cases tested and shows its greatest advantages in the fairly good predicting of liquid phase densities.更多还原