四次型状态方程计算若干物质的固-液-气三相物性

Calculation of solid-liquid-vapor PVT properties of pure substances using a quartic CCOR-PT equation of state

为考察四次型状态方程(CCOR-PT EOS)的性能,对苯酚、乙烷、正壬烷、丙酮、乙酸乙酯、二氧化碳、甲苯、正庚烷、乙炔、正己烷、辛烷11个物质的固-液-气三相压力、体积、温度(PVT)物性,使用CCOR-PT EOS进行计算,并与文献数据相比较。同时考察了物质的固有参数对计算结果的影响。结果表明,该方程能够较好地描述包括固体升华压力、固体密度等在内的三相PVT物性,计算结果对临界压缩因子ZC的敏感程度大于偏心因子ω。

To evaluate the performance of a quartic CCOR-PT equation of state(CCOR-PT EOS),the solid-liquid-vapor PVT(pressure,volume,temperature)properties of 11 different compounds,including phenol,ethane,n-nonane,acetone,ethyl acetate,carbon dioxide,toluene,n-heptane,acetylene,n-hexane,and octane,were calculated using the CCOR-PT EOS.The calculated results were compared with literature data,and the effects of material intrinsic parameters on the calculation results were investigated.The results show that the equation could well describe the PVTproperties of three-phase,including the sublimation pressure and density of solids.The calculated results are more sensitive to the critical compression factor ZC than to eccentric factorw.