Calculate the Pxy-diagram at 70 °C for the system ethanol (1) – benzene (2) assuming ideal vapor phase behavior using the Wilson equation. The binary Wilson parameters L12 and L21 should be derived from the activity coefficients at infinite dilution (see Table 5.6). Experimentally the following activity coefficients at infinite dilution were determined at this temperature:
In the first step the Wilson binary interaction parameters have to be calculated from the activity
coefficients at infinite dilution. As there is no analytical solution to the system of two equations with two unknowns, a Given-Find Block is used: