三元混合物正己烷/正庚烷/正辛烷的临界性质测量

Measurement on critical properties of hexane/heptane/octane ternary mixtures

应用流动法临界性质实验系统测量了正己烷、正庚烷、正辛烷不同质量配比(配比梯度:0.1)下三元混合物的临界温度和临界压力。实验结果表明,该混合物的临界温度和压力总体过渡平滑,临界温度随正辛烷的增加而升高,随正己烷的增加而降低;临界压力随正辛烷的增加而降低,随正己烷的增加而升高。固定一种物质质量分数时,临界性质随另外两种组分的变化基本呈线性关系。依据实验数据,给出了正己烷、正庚烷、正辛烷三元混合物的临界性质经验公式。

The critical temperatures and pressures of hexane＋heptane＋octane ternary mixture with different mass fractions（0.1gradient）were measured by using low-residence time flow method.The results show that the smooth transition of the critical temperature rises with the increase of octane but decreases with the increase of hexane.Moreover,there also exists a smooth transition of the critical pressure,which is reduced with the increase of octane and rised with the increase of hexane.When the mass fraction of one component is kept at constant,there is a linear relation among the critical temperature,critical pressure and the change of other two components.Moreover,the correlations of the critical temperatures and pressures of hexane＋heptane＋octane ternary mixture are presented,respectively.