化学
波动性(金融)
丙烷
摩尔分数
热力学
相对波动率
状态方程
摩尔体积
蒸汽压
表面张力
分析化学(期刊)
色谱法
有机化学
物理化学
蒸馏
物理
金融经济学
经济
作者
Xinyun Pu,Rui Cao,Yansheng Liu,Yaping Hao,Wei Jiang,Lehuan Wu,Zhenmin Bai
标识
DOI:10.1016/j.fluid.2018.06.016
摘要
In this research, a prediction method for the vapor-liquid equilibrium compositions of the propylene-propane mixture by the combined use of the COSMO-RS method and the Peng-Robinson equation of state is examined. Employing the van der Waals (VdW) mixing rule, the average deviations from this method for both the pressures and vapor phase compositions are no more than 0.62% and 0.75%, respectively. The average deviations for the relative volatility and tray efficiency are 0.93% and 5.52%, respectively. This method successfully describes the relative volatility of this system is not only related to the temperature but also dependent on the propylene mole fraction at low temperatures and high propylene concentrations. The density, excess molar volume and surface tension data are listed. The calculations explain the irregular phenomenon of the relative volatility. The results show that the non-ideality of this system comes from the dispersions between the components dominates the bulk liquid properties at low temperatures and high propylene concentrations.
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