GE型状态方程混合规则计算烃-水相平衡的结果对比

将PRSV方程分别与 5种有代表性的GE 型状态方程混合规则相结合 ,计算了烃水体系相平衡参数 ,并对计算结果进行了对比。轻质烃类水体系相平衡的计算结果表明 ,以范德华流体为参考态推导的Kurihara和Twu Coon混合规则无法正确描述烃水两相的组成 ,而Huron Vidal与Wong Sandler混合规则的计算偏差也较大 ,只有MHV2的计算精度与传统的使用组成依赖的交互作用参数的Kabadi混合规则相当。对正己烷水体系的三相平衡和临界轨迹线的计算表明 ,MHV2混合规则虽然在烃水互溶度的计算上具有优点 ,但在靠近临界点附近的计算还有改进的必要

MODELING COMPARISON OF PHASE BEHAVIORS OF HYDROCARBON-WATER MIXTURES USING SEVERAL MIXING RULES OF GE TYPE EOS

PRSV EOS incorporated with five typical G E type mixing rules, including Huron\|Vidal(HV), Kurihara, MHV2, Wong\|Sandler(WS) and Twu\|Coon(TC), is used to modeling the hydrocarbon\|water system. A systematic comparison is made on their abilities in mutual solubility, three phase equilibrium pressure and critical locus calculation. It shows that Kurihara and TC mixing rules, which are based on vdW reference fluid, are incapable for describing mutual solubility of hydrocarbon\|water system. HV and WS mixing rules may give large errors for these systems either. Only MHV2 mixing rule gives the accurate correlation, which is similar to the traditional Kabadi mixing rule used in hydrocarbon\|water mutual solubility correlation. The calculations of three\|phase equilibrium pressure and critical loci for \%n\%\|hexane\|water show that although MHV2 mixing rule gives the best correlation for mutual solubility among the five mixing rules, it predicts an incorrect critical loci.