Example 08.03 SLE of Benzene - Ethanol Using UNIQUAC


Calculate the solubility of benzene(2) in ethanol(1) at 260 K. The activity coefficients in the liquid phase should be taken into account by the UNIQUAC equation.





input data


First calculate the activity (x*g) of solid benzene at T = 260K:

Now we need a function to calculate the activity coefficients as f(x,T) using UNIQUAC:

We use the root function to find the mole fraction of component 2 for which the liquid activity is equal to the solid activity in the mole fraction range from 0 to 1. As a starting value we set the mole fraction to the solid activity.

For a graphical representation, this calculations can be defined as function of temperature.

starting value for root