Abstract
Liquid−liquid equilibrium data are presented for mixtures of (acetonitrile + a carboxylic acid + heptane) at 298.15 K. The carboxylic acids (C2−C5) are acetic acid, propanoic acid, butanoic acid, 2-methylpropanoic acid, pentanoic acid, and 3-methylbutanoic acid. The relative mutual solubility of all the carboxylic acids is higher in the acetonitrile layer than in the hydrocarbon layer. The influence of 3-methylbutanoic acid, pentanoic acid, 2-methylpropanoic acid, and butanoic acid on the solubility of the hydrocarbons in acetonitrile is greater than that of the acetic and propanoic acids. Three three- parameter equations have been fitted to the binodal curve data. These equations are compared and discussed in terms of statistical consistency. Selectivity values for solvent separation efficiency were derived from the equilibrium data. The NRTL and UNIQUAC models were used to correlate the experimental results and to calculate the phase compositions of the ternary systems. The NRTL equation fitted the expe...
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