用硬球3参数状态方程计算混合物临界性质

Calculation of mixture critical properties by a hard-sphere three-parameter equation of state

应用硬球3参数状态(CSPT)方程关联了含烷轻、芳烃、含氧烃以及无机气体的各类型二元混合物系的汽液临界轨迹,并提出一个简单、快速的对于混合物临界性质的计算方法。计算结果表明,采用与温度有关的二元相互作用参数,使计算精度获得显著改善。同时给出了PT方程的计算结果以作比较。另外,将由二元临界数据获得的二元相互作用参数用于推算H_2-CO和H_2-CO_2物系的高压汽液平衡,推算结果十分满意。

The hard-sphere three-parameter equation of state proposed in our previous investigation was applied to correlate binary critical loci of systems containing alkane, aromatics, oxygenated hydrocarbons and inorganic gas. A new procedure was also presented which simplified mathematical manipulations and permitted the reduction of the computation time. The results were compared with those obtained by the Patel- Teja equation with temperature-dependent binary interaction parameters. The significant improvements were achieved by the proposed equation with temperature- dependent parameters. In addition, the parameters obtained from the critical locus calculations were used to predict vapiorliquid equilibria of hydrogen- carbon monoxide and hydrogen- carbon dioxide systems. The prediction accuracies were very satisfactory.