RT info:eu-repo/semantics/article
T1 Orientational effects in alkanone, alkanal or dialkyl carbonate + alkane mixtures and in alkanone + alkanone or + dialkyl carbonate systems
A1 Hevia de los Mozos, Luis Fernando
A1 González López, Juan Antonio Mariano
A1 Alonso-Tristán, Cristina
A1 García de la Fuente, Isaías Laudelino
A1 Sanz del Soto, Luis Felipe
K1 Termodinámica
K1 2213 Termodinámica
AB Interactions and structure of alkanone, or alkanal or dialkyl carbonate + alkane mixtures, or of 2-alkanone+ 2-alkanone, or of ketone + dialkyl carbonate systems have been investigated by means of a set of thermodynamic properties and by the application of the Flory model. The properties considered are excess molar quantities: enthalpies, H_m^E, volumes, V_m^E, or isobaric heat capacities, C_pm^E, and liquid-liquid equilibria. Experimental data show that alkane mixtures are characterized by rather strong dipolar interactions. In the case of systems containing ketones with the same number of C atoms and a given alkane, dipolar interactions become weaker in the sequence: aromatic > cyclic > linear. In addition, the mentioned interactions become also weaker in the order: dialkyl carbonate > linear alkanone > linear alkanal. This is an important result, as carbonates show lower effective dipole moments than the other compounds, and it suggests that the group size may be relevant when evaluating thermodynamic properties of liquid mixtures. Results on H_m^E from the Flory model show that orientational effects (i.e., non-random mixing) are rather similar for systems with linear, cyclic or aromatic ketones or alkanals and alkanes. In contrast, orientational effects become weaker in dialkyl carbonate + alkane mixtures. The behaviour of 2-alkanone + 2-alkanone systems and of mixtures of longer 2-alkanones or cyclohexanone with dialkyl carbonate is close to random mixing. Larger orientational effects are encountered in solutions of carbonates and shorter 2-alkanones.
PB Elsevier
SN 0167-7322
YR 2017
FD 2017
LK https://uvadoc.uva.es/handle/10324/69170
UL https://uvadoc.uva.es/handle/10324/69170
LA spa
NO Journal of Molecular Liquids, 2017, 233, 517-527
DS UVaDOC
RD 09-nov-2024