Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

This work focused on the development of the phase equilibria models required to describe the behavior of mixtures involved in the synthesis of tributyl citrate (TBC) via esterification of citric acid (CA) and butan-1-ol (BuOH). Vapor-liquid equilibrium (VLE) for the mixture TBC-BuOH, liquid-liquid equilibrium (LLE) for the ternary mixture TBCH2O-BuOH, and solubility data for the mixture CA-BuOH-TBC, were measured at different temperatures. The thermodynamic consistency was verified with the Wisniak test for VLE data, and the LLE data exhibited linear behavior in an Othmer & Tobias plot. Together with reported equilibrium data from the open literature, the measured equilibrium data sets were regressed with the UNIQUAC equation to fit the binary interaction parameters of the components in the mixture. The obtained model agrees well with the whole set of experimental data and can be used for further process design.