Critical mixing point data, estimation

For the system PMMA/PVDF one can estimate the volume of mixing according to Eq. (22). As the key-point, the system exhibits both LCST and UCST. The critical points are reported to be about at 325 and 140 °C for 50/50 blends [11], These data can be used to calculate, from Eqs. (18) and (19), the quantities XAB and p. 

Figure 10.3-7 Vapor-liquid equilibrium of the carbon dioxide (l)-isopentane (2) system. The experimental data of G. J. Besserer and D. B. Robinson [J. Chem. Eng. Data. 20, 93 (1976)] are shown at 271.59 K (r = liquid and a = vapor) and 377.65 K ( = liquid and = vapor). The dashed curves are the predictions using the Peng-Robinson equation of state and the van der Waals mixing rule with kn = 0, and the solid lines are the correlation using the same equation of state with ij = 0.121. Thq points o and are the estimated mixture critical points at 377.65 K using the same equation of state with k 2 = 0 and 0.121, respectively.

The critical solution temperature is the minimum or maximum temperature at which two liquids mix in all proportions. This compilation by A. W. Francis provides this data for over 6000 systems, shows how it can be determined or estimated, and gives 800 aniline point observations. Borax to Boranes. 

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