Repeat Problem 8.65 using the Peng–Robinson equation of state. Use a value for the binary interaction parameter of:

(a) 0

(b) 0.077

Problem 8.65

Using the equation of state method, construct a Pxy diagram for a binary mixture of carbon dioxide (1) and benzene (2) at 100°C. Use the van der Waals equation of state to determine fugacity for both vapor and liquid phases. To converge on the liquid mole fraction, it is helpful to start with an initial guess for pressure that is less than Raoult’s law (e.g., 106 Pa).