Investigation of Azeotropic Points in Multicomponent Systems

Check with the help of modified UNIFAC, whether the homogeneous quaternary system benzene (l)-cyclohexane (2)-acetone (3)-ethanol (4) shows binary, ternary, or quaternary azeotropes at atmospheric pressure. 

The azeotropic points in homogeneous systems can be determined with the procedures introduced in Chapter 5, for example, in binary systems by looking for a composition for which the separation factor au shows a value of unity - or more general - the following objective function F shows a value of zero for binary or 

Instead of a g -model of course also an equation of state can be applied to calculate or predict the required separation factors. This is demonstrated in Example 11.3. 

For the determination of the azeotropic points again, the Mathcad program can be used. The results are shown in Table 11.3 together with the experimental data 

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