Experimental data for ternary liquid-liquid equilibria (LLE) have been coll
ected from the literature and the errors of correlation have been studied u
sing the UNIQUAC and NRTL equations. Furthermore, prediction errors for the
ternary data using the UNIQUAC model and the data for binary liquid-liquid
equilibria or binary gas-liquid equilibria have been examined. The purpose
of the present study is to examine the effect of hydrogen bonds on the err
ors of correlation and prediction.
The total number of systems for which data were collected is 596. The avera
ge absolute deviation (AAD) between the equilibrium composition given by th
e experimental data and that correlated is 0.73 % for the UNIQUAC model and
0.75% for NRTL. The AAD for prediction with the UNIQUAC model is as low as
1.2%. The AADs for correlation and prediction are different for the differ
ent types of solubility curves drawn in triangular diagrams. Thus, for exam
ple, the AADs are large when a ternary liquid-liquid system includes a solu
te or a solvent forming strong hydrogen bonds in their pure liquid states.