| Abstract
| - Liquid−liquid equilibrium data of water + acetic acid + propionic acid + solvent (butyronitrile, benzyl acetate,and methyl isobutyl ketone (MIBK)) quaternary systems were measured. Complete phase diagrams were obtainedby determining solubility curves and tie-line data at 298.15 K. The experimental data were compared with predictedvalues obtained from the UNIFAC method. Selectivity values for solvent separation efficiency were derivedfrom the tie-line data. A comparison of the extracting capabilities of the solvents was made with respect todistribution coefficients, separation factors, and solvent-free selectivity bases. The reliability of the data wasascertained from Othmer−Tobias plots. We conclude that the performance of the solvents increases in the orderof butyronitrile, MIBK, and benzyl acetate.
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