Abstract

An association model was developed to correlate the isothermal vapour-liquid equilibrium data of the binary systems propanoic acid + benzene, + n-heptane, + chlorobenzene, + cyclohexane, + tetrachloromethane and + 2-butanone, and butanoic acid + 2-butanone. The model uses a concentration-dependent mole fraction association constant for carboxylic acids in the liquid phase, with allowance for molecular interactions between the true chemical species expressed by the NRTL (non-random two liquid) equation. The model quantitatively reproduces the experimental results in a satisfactory manner over the whole composition range.

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