Experimental HE data were taken from literature and used together with the experimental P − x data to simultaneously fit temperature dependent interaction parameters for UNIQUAC and NRTL. The parameters were used to predict the azeotropic composition over a large temperature range. The results were compared with those of a simple analytical thermodynamic equation using only the pure component vapor pressure data, heats of mixing in the heterogeneous region and the azeotropic composition at one temperature.
Heats of mixing were measured at 140°C with the help of a flow calorimeter in order to determine the slope of HE vs. x1 in the heterogeneous region. The HE data were used to check the reliability of the GE model parameters and the equation to calculate the temperature dependence of the heteroazeotropic composition. 相似文献