Thermodynamic properties of binary mixtures containing tetrahydropyran: Excess molar volumes, excess molar enthalpies and isentropic compressibilities changes of mixing

Thermodynamic Properties of Binary Mixtures of Tetrahydropyran with Anilines at 308.15 K

“…We are unaware of any V E , H E , κ S E , and G E data of the studied mixtures with which to compare our results. However, speeds of sound values for the purified liquids at (298.15 ± 0.01) K (recorded in Table ) compare well with their corresponding experimental values. ,, V E , H E , κ S E , and G E data of these mixtures are negative over entire mole fraction range. While H E data for an equimolar mixture vary in the order MA > 2MA > A, V E data vary as MA > A > 2MA.…”

“…Tetrahydropyran (THP) (Fluka, > 0.98 GC), aniline (A) (Fulka, > 0.98 GC), N -methylaniline (MA) (Fluka, > 0.98 GC), and 2-methylaniline (2MA) (Fluka, > 0.99 GC) were purified by standard methods . The purities of the purified liquids were checked by measuring their densities [recorded in Table ] using a bicapillary pycnometer at (298.15 ± 0.01) K, and these agreed to within ± 0.05 kg·m −3 with their literature values. , …”

“…For this purpose, it was assumed that THP (1) + A or MA or 2MA (2) binary mixture formation involves processes: (i) formation of unlike contact between 1 n and 2 n molecules; (ii) unlike contact 1 n −2 n formation then weakens 1 n −2 n interactions and leads to the depolymerization of 1 n and 2 n ; and (iii) the monomers of 1 and 2 then undergo specific interactions to form a 1:2 molecular complex. If χ 12 , χ 11 , χ 22 , and χ* 12 are molar interactions and molar compressibility interaction parameters for 1−2, 1−1, and 2−2 contacts and specific interactions, respectively, then change in molar thermodynamic properties, Δ X ( X = H or κ S ), due to processes (i) to (iii) would be given ,− by X E = true[ x 1 x 2 false( normalξ 3 1 / normalξ 3 2 false) x 1 + x 2 false( normalξ 3 1 / normalξ 3 2 false) true] false[ χ 12 + x 1 χ 11 + x 1 χ 22 + x 2 χ 12 * false] <...…”

“…Thermodynamic properties of liquid mixtures like excess molar volumes, V E , excess molar enthalpies, H E , isentropic compressibility changes of mixing, κ S E , and excess Gibb’s free energy, G E , have extensive applications in chemical engineering, design calculations for heat transfer, mass transfer and fluid flow, process simulation, solution theory, and molecular dynamics. In recent studies, − topology of the constituents of binary or ternary mixtures has been employed to predict excess molar volumes, excess molar enthalpies, and isentropic compressibility changes of mixing of binary liquid mixtures. An attempt has been made here to predict excess Gibb’s free energy of binary mixtures by employing the topology of a molecule.…”