Densities of (2-butanol + n-hexane + 1-butylamine) atT = 298.15 andT = 313.15 K: excess and partial excess molar volumes and application of the ERAS model

Abstract

Densities of {xCH3CH(OH)CH2CH3+ (1 −x)CH3(CH2)4CH3} at T= 298.15 K and T= 313.15 K, {xCH3CH(OH)CH2CH3+ (1 −x)CH3(CH2)3NH2} at T= 313.15 K, {xCH3(CH2)4CH3+ (1 −x)CH3(CH2)3NH2} at T= 298.15 K, and {x1CH3CH(OH)CH2CH3+x2CH3(CH2)4CH3+ (1 −x1−x2)CH3(CH2)3NH2} at T= 298.15 K and T= 313.15 K, have been measured. From these densities, excess molar volumes were calculated and fitted to the Redlich–Kister equation for the binary mixtures and to the Jasinski, Cibulka, Singh, Pintos and Calvo equations, for the ternary system. The partial excess molar volumes of each component in the mixtures have been determined. Several methods for the prediction of excess properties of multicomponent systems from binary systems data have been tested. Finally, the ERAS model has been used at T= 298.15 K to predict the excess molar volume of the ternary mixture. Qualitatively, the ERAS model gives an adequate representation of this system, with the shapes of both experimental and predicted curves being similar.