Excess molar enthalpies for binary and ternary mixtures containing cyclic ether, 2-methylaniline and aromatic hydrocarbons

Topological investigations of binary mixtures containing ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate and pyridine or isomeric picolines

“…1-Ethyl-3-methylimidazolium tetrafluoroborate is one of the latest investigated ionic liquid and thermodynamic data of mixtures relating to this ionic liquid is scarce [8][9][10][11]. In recent studies [12][13][14][15] Graph theory has been employed successfully to predict excess molar volumes, V E , excess molar enthalpies, H E , excess isentropic compressibilities, j E S and excess Gibb's free energy, G E data of the various binary as well as ternary mixtures comprising of organic solvents. It would be of interest to see how Graph theory describes the V E , H E , and j E S values of the investigated binary ionic liquid mixtures.…”

Densities and Excess Molar Volumes of the Ternary System (1,4-Dioxane + 2-Propanol + 1,1,2,2-Tetrachloroethane) at T = 288.15–318.15 K and at Atmospheric Pressure: Experimental Measurements and Prigogine–Flory–Patterson Modeling

“… values, for pure components, were calculated using our experimental density values, , whereas those of speed of sound, u i , and those of heat capacity, C pi , were calculated from literature data. 9,12,18,22,[38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] Table 9. It appears, from this table, that the interactional contribution value is negative for the two systems and is predominant in the case of 1,4-dioxane containing mixture.…”

“…The reduced volume, V ̃ i , of a constituent i is given by where the thermal expansion coefficient, α i , is defined by The characteristic pressure and volume, P i * and V i * , respectively, are defined by where the isothermal compressibility κ T i of a constituent i is given by The values of the parameters α i , V i * , and P i * for pure components were estimated from the Flory theory, whereas the thermal compressibility κ T i values were obtained using the equation The Newton–Laplace equation was used to estimate the isentropic compressibility values, κ S , for pure components The κ T i values for pure components were calculated using our experimental density values, ρ, whereas those of speed of sound, u i , and heat capacity, C p i , were calculated from the literature data. ,,,,− All the α i , κ T i , V i * , and P i * values, which were used in PFP calculation, are summarized in Table . The interchange parameter, χ 12 , was derived by fitting the V E expression (eq ) to our experimental V E values at T = 298.15 K. The adjusted values of χ 12 and the calculated three contributions to the V E values at equimolar fraction are reported in Table .…”

Excess Heat Capacities of Binary Mixtures Containing o-Chlorotoluene and Pyridine or Isomeric Picolines or Aromatic Hydrocarbons

“…Singh et al [43] have also shown that the value of 3 n of a molecule represents a measure of the probability that its surface area interacts effectively with the corresponding surface area of another molecule and within the same isomeric species, the molar volume of a molecule varies inversely as its 3 n. Excess molar volumes, V E , excess molar enthalpies, H E , excess isentropic compressibilities, j E S , and excess Gibbs energy, G E , of binary or ternary liquid mixtures have been successfully determined [44][45][46][47][48][49][50] by utilizing 3 n values of the constituent molecules (Graph theory).…”