乙醇－水－磷酸体系的常压汽液平衡

Vapour-liquid Equilibrium of a Ternary System C_2H_5OH-H_2O-H_3PO_4 under Atmospheric Pressure

在Ｅｌｌｉｓ平衡釜中进行了Ｃ２Ｈ５ＯＨ－ＯＨ－Ｈ２Ｏ－Ｈ３ＰＯ４体系在不同Ｐ２Ｏ５，浓度下的汽液平衡研究。当Ｐ２Ｏ５浓度（ｗｔ％）由０％改变到３５％时，体系呈盐析效应；而在Ｐ２Ｏ５浓度４０％到４５％，在低乙醇浓度范围内，体系呈盐溶效应；在其他浓度范围，仍呈盐析效应。Ｐ２Ｏ５的加入消除了体系的恒沸点。在实验基础上，一定Ｐ２Ｏ５浓度范围内，用修正的佐田模型对部分实验数据进行了关联，结果较为满意。

The vapour-liquid equilibrium of a ternary system C2H5OH-H2O-H3PO4 at different P2O5 concentrations was measured.The results show that at P2O5 concentration of 10-30% (wt),the salting-out effect is observed,and at P2O5 concentration of 35-45%(wt),the salting-in effect is observed. The results also show that no azeotropes is occurred in the P2O5 concentration range tested. The experimental data are well correlated with Sata model.