RT info:eu-repo/semantics/article
T1 Thermodynamics of mixtures with strong negative deviations from Raoult’s law. XVIII: Excess molar enthalpies for the (1-alkanol + cyclohexylamine) systems at 298.15 K and modelling
A1 Sanz del Soto, Luis Felipe
A1 González López, Juan Antonio Mariano
A1 García de la Fuente, Isaías Laudelino
A1 Cobos Hernández, José Carlos
A1 Hevia de los Mozos, Luis Fernando
K1 Termodinámica
K1 2213 Termodinámica
AB Excess molar enthalpies, HEm have been measured using a Tian-Calvetmicrocalorimeter for the systems CH 3 (CH 2 ) u -1 OH ( u =1,2,3,4,7,10) +cyclohexylamine at 298.15 K and 0.1 MPa. The HEm values are large and negative,indicating the existence of strong interactions between unlike molecules, which isconsistent with the also large and negative excess molar volumes, VEm of thesesolutions, previously measured by us. The contribution from the equation of state termto HEm has been evaluated for the 1-alkanol + cyclohexylamine, or + 1-hexylamine, or+ aniline mixtures, and the corresponding excess molar internal energies at constantvolumes, UEmv, determined. It is shown that such contribution is particularly importantfor the methanol + aniline system, in such way that the excess functions HEm andUEmv have different sign at x 1 = 0.5. The DISQUAC and ERAS models have beenapplied to the cyclohexylamine systems, and the interaction parameters reported.DISQUAC improves ERAS results on HEm. The latter model describes correctly theVEm curves. The variation of HEm of CH 3 (CH 2 ) u -1 OH + cyclohexylamine, or+ 1-hexylamine, or + aniline mixtures with u along a homologous series with a givenamine, or with the amine in mixtures with a given 1-alkanol is discussed in terms of thedifferent interactional contributions to HEm.
PB Elsevier
SN 0021-9614
YR 2021
FD 2021
LK https://uvadoc.uva.es/handle/10324/69161
UL https://uvadoc.uva.es/handle/10324/69161
LA spa
NO The Journal of Chemical Thermodynamics, 2021, 157, 106395
DS UVaDOC
RD 23-nov-2024