In

Average deviation = — , where N is the times of experiments.

It can be seen from Table 26 that the difference of interaction parameters between two cases is somewhat obvious, but the average deviation Ay, in both cases is small enough.

The reason may be that the activity coefficients of water and acetic acid aren't changed apparently at the total concentration, and the interaction parameters of the VLE models can be correlated well. Even so, it manifests that the influence of two-molecule aggregation on the interaction parameters can't be ignored.

Interaction parameters of Wilson, NRTL and UNIQUAC equations for the system of water (1)

Interaction parameters of Wilson, NRTL and UNIQUAC equations for the system of water (1)

Equation ^

Ai\

Ay,

1. Not considering two-molecule aggregation

Wilson 3766.34 NRTL (a = 0.47) 87.86 UNIQUAC -2882.96

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