P—R方程新的混合规则和含超临界甲烷体系高压相平衡的预测

A NEW MIXING RULE FOR P-R EQUATION OF STATE AND PREDICTION OF HIGH-PRESSURE VAPOR-LIQUID EQUILIBRIA OF BINARY SYSTEMS CONTAININiG METHANE

一、前言 能源、石油、化工领域均需要可靠的汽液平衡数据,一般来说,人们可以通过实验获得。然而,高压相平衡实验既耗费人力、财力又十分困难,故汽液平衡的预测是一个十分感兴趣的问题。 Peng—Robinson方程常被用来预测高压汽液平衡,对于分子大小和临界性质相近的石油烃类,该方程能给出较好的预测结果,但对于由甲烷和高碳烃类组成的非对称体系,

A new mixing rule for the Peng-Robinson equation of state is proposed to calculate binary interaction parameter only from critical temperature and critical compressibility factor of pure component.Peng-Robinson equation of state with the new mixing rule can successfully predict vapor-liquid equilibria at high-Pressure for binary mixtures. involving methane.