Health & Environmental Research Online (HERO)


Print Feedback Export to File
4870991 
Journal Article 
Thermodynamics of ketone plus amine mixtures 7. Volumetric and speed of sound data at (293.15, 298.15 and 303.15) K for 2-pentanone plus aniline, plus N-methylaniline, or plus pyridine systems 
Alonso, I; Mozo, I; Garcia De La Fuente, I; Antonio Gonzalez, J; Carlos Cobos, J 
2011 
Yes 
Journal of Molecular Liquids
ISSN: 0167-7322 
160 
3 
180-186 
WOS:000291332600010 
Densities, rho, and speeds of sound, u, of 2-pentanone + aniline, + N-methylaniline, or + pyridine systems have been measured at (293.15, 298.15 and 303.15) K and atmospheric pressure using a vibrating tube densimeter and sound analyzer Anton Paar model DSA-5000. The rho and u values were used to calculate excess molar volumes, V(m)(E), and the excess functions at 298.15 K for the speed of sound, u(E), the thermal expansion coefficient, alpha(E)(P), and for the isentropic compressibility, kappa(E)(S) at 298.15 K. V(m)(E) and kappa(E)(S) are both negative magnitudes and increase in the same sequence: aniline <N-methylaniline< pyridine, while uE is positive and increases in the opposite way. The similar trends are observed for mixtures including the same aromatic amines and propanone, 2-butanone or 2-heptanone. The data have been interpreted assuming strong ketone-amine interactions, which become weaker when the chain length of the 2-alkanone is increased in solutions with a given aromatic amine. Ketone-amine interactions are more easily created in mixtures with aniline. Interactions between unlike molecules are stronger than in 2-alkanone + dipropylamine, or + dibutylamine, or + triethylamine systems. These findings are confirmed by the results obtained from internal pressures and molecular interaction parameters for the investigated mixtures. (C) 2011 Elsevier B.V. All rights reserved. 
Densities; Speeds of sound; Compressibilities; 2-Alkanone; Amines; Interactions; Internal pressure