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Liquid-liquid equilibrium data have been measured for one ternary system of water + N-methyl-2-pyrrolidone + 1-hexanol and three quaternary systems of water + N-methyl-2-pyrrolidone + 1-hexanol + sodium chloride, + potassium chloride, or + potassium acetate at temperatures (283.15 and 323.15) K under atmospheric pressure. The liquid-phase splitting for the ternary system of water + N-methyl-2-pyrrolidone + 1-hexanol can be enhanced by adding the same percentage of salts (sodium chloride, potassium chloride, or potassium acetate), and the influence follows the order of sodium chloride > potassium chloride > potassium acetate. The experimental data were also compared with the values calculated by the electrolyte-NRTL model. In general, the model reproduces reasonably for the LLE phase diagrams.

Densities and viscosities were measured for the binary mixtures of n-butylamine with 2-hexanol, 3-hexanol, 2-methyl-1-pentanol, 2-methyl-2-pentanol, and 4-methyl-2-pentanol at 303.15 K, 313.15 K, and 323.15 K over the entire composition range. Excess volumes and viscosity deviations were calculated at various temperatures. Both excess molar volumes and viscosity deviations are negative for all investigated systems. A Redlich−Kister-type equation was fit to the isothermal excess molar volumes and viscosity deviations, and McAllister's three-body and four-body interaction models were also used to correlate the kinematic viscosities.

Liquid−liquid equilibrium (LLE) data for the ternary systems water + 2-butanol + methyl methacrylate, butyl methacrylate, and isobutyl methacrylate were determined at atmospheric pressure and at (288.2 and 318.2) K. The reliability of the experimental tie-line data was determined through the Bachman plots. The experimental data were also compared with the values correlated by the NRTL and UNIQUAC models. Good quantitative agreement was obtained with these models. In general, the average deviations from the UNIQUAC model are slightly smaller than those from the NRTL model.

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