Chapter 12.7, Problem 19P

You work in a developing nation for a large chemical company. Your division works on refrigerants and foam-blowing agents. You have need to correlate a set of data for the trifluoromethane (1) + trifluorochloromethane (2) system at 31.9 F. You know the following about your system:

Using a gamma-phi modeling approach, calculate the Pxy diagram for the system using the Wilson equation and the virial equation. Compare the predicted values with the experimental data provided (on the same plot) in Table P12-19. Also, please provide two additional modeling approaches to the plot.

1. 1. Model the system using modified Raoult’s Law (ideal gas for the vapor). This includes calculating the activity coefficients assuming an ideal gas for the vapor (as in Chapter 11).
2. 2. Model the system using Raoult’s Law.

Table P12-19 Vapor-liquid equilibrium of trifluoromethane (1) + trifluorochloromethane (2) at 31.9°F.