Thermodynamic study of selected monoterpenes

Molar heat capacities of the mixture {1,8-cineole + ethanol} at several temperatures and atmospheric pressure

“…On the other hand, the molar heat capacity of 1,8-cineole extrapolated at 298.15 K is comparable to those of several monoterpenes [25,26] of similar molar mass and bicyclic structure as can be seen in table 6. In any case, the molar heat capacity of 1,8-cineole is quite large and a significant part of it can be attributed to the presence of two rings fused forming a bridge, a feature that would bring about a remarkable structural strain.…”

Thermodynamic Analysis of α‐Pinene and Limonene Allylic Oxidation over a FePcCl16‐NH2‐SiO2 Catalyst

“…4 contains the liquid heat capacities of substances calculated by B-m, TP-m, and ABWY-m. The values obtained with the ABWY-m were similar to experimental data reported for verbenone (17 % error) and verbenol (0.4 % error) [27].…”

“…The reported experimental vaporization enthalpy at 298 K determined by a gas-liquid chromatographic method based on the Kovats retention indices for limonene is 49.9 kJ mol -1 and for limonene 1,2-epoxide 57.1 kJ mol -1 [26]. The vaporization enthalpy of (-)-verbenone is 58.9 ± 1.5 kJ mol -1 and the sublimation enthalpy of (-)-cis-verbenol reported is 80.0 ± 1.2 kJ mol -1 at 298 K, obtained with a Calvet calorimeter [27].…”

“…2, the simulated values of vaporization enthalpy for verbenone, limonene, and limonene 1,2-epoxide were lower than the reported experimental values. For verbenol, the enthalpy of sublimation is described [27] instead of the enthalpy of vaporization because this substance is in solid state under normal conditions. The experimental enthalpy of sublimation was higher than the simulated enthalpy of vaporization because the change to the vapor phase in the sublimation process is from the state of lower energy (solid phase) in contrast to the vaporization process that is from a state of higher energy (liquid phase).…”

Vapor pressures and thermophysical properties of selected monoterpenoids

“…This work presents a continuation of our effort to establish reliable physico-chemical data for biogenic compounds relevant to environmental modeling as well as to other types of calculations requiring the phase equilibrium and thermodynamic data. The thermodynamic properties of eleven monoterpenes, α-pinene, β-pinene, cis-verbenol, verbenone, camphor, camphene, fenchone, trans-pinane, eucalyptol, Δ-carene, and limonene were reported in our previous works [3][4][5]. The thermodynamic properties of borneol were also reported in [4] over a shorter temperature range.…”