Abstract: An apparatus for the measurement of vapor pressure of solutions by static method is established. It includes an equilibrium cell, mercury manometer, degassing vessel and high vacuum device. With these apparatus, the vapor pressure of acetic acid-water binary mixture over the temperature range 25-75℃ were determined. In order to get complete isothermal vapor liquid equilibrium data, the equilibrium vapor compositions were calculated by a direct thermodynamic method developed by us formerly. The vapor phase association has been taken into consideration in calculations.The results are presented in tabular form. A thermodynamically derived polynomial formula correlating the activity coefficients and temperatures has been developed to fit the experimental results. The parameters of the polynomials were obtained by least square method. With the use of these parameters and extrapolating to ordinary pressure, the prediction of bubble points and vapor compositions are in good agreement with the ordinary isobaric experimental data reported in literatures.These parameters can be recommended for the purpose of practical vapor liquid equilibrium calculations over the wide range from low pressure to ordinary pressure.

摘要： 建立了利用静态法测定溶液蒸气压的装置,它包括平衡器、零压计、水银压差计、脱气室以及高真空设备。在此装置中测定了醋酸-水二元系在25—75℃范围内的蒸气压。为了得到完整的恒温汽液数据,利用我们先前发展的一个直接热力学方法来计算平衡汽相组成,计算时考虑了汽相缔合。本文中用表格形式发表了所得的计算结果。 为了拟合实验数据,用了一个由热力学推导得到的关联活度系数与温度的多项式,多项式参数由最小二乘法求得。利用这些参数,并外推至常压,预测所得泡点和汽相组成与文献报导的恒压实验数据,具有良好地一致。这些参数,可在低压至常压的广阔范围内的实际汽液平衡计算中使用。