Analysis of thermodynamic models representing mixtures with hydrocarbons, water and alcohol. 2. Prediction of thermodynamic properties of binary systems using restricted experimental data

In this work we have been interested in the problem of predicting thermodyn amic properties of binary systems in a wide range of temperature or pressur e. Towards this end, we have estimated the parameters of the models conside red in a previous paper by using both vapor-liquid equilibrium data and mix ing enthalpies determined at low temperatures (usually at 298.15 K). The ob tained results show that at moderates temperatures, the representation of t he vapor-liquid equilibria and mixing enthalpies is comparable to that obta ined with the parameters estimated over the whole set of data used in the f irst part of this work. At high temperature, the calculation of the vapor-l iquid equilibria is very satisfactory. The interest of this method remains, of course, in the limited quantity of data which we can dispose (i.e., the rmodynamic properties at a single temperature), but also in the method of p arameter estimation that ensure the thermodynamic consistency of the models .