Excess volumes of mixtures of oxolane, oxane, 1,3-dioxolane, and 1,4-dioxane with n-alkanes at 298.15, 308.15, and 318.15 K

Abstract

Molar excess volumes V* have been measured as a function of mole fraction at 288.15, 308.15, and 318.15 K for binary liquid systems of the type cyclic ether (x.,) + n -alkane by using pycnometry and, In three cases, vibrating-tube denslmetry (VTD). The cyclic ethers were oxolane (tetrahydrofuran, C4HaO), oxane (tetrahydropyran, CaH10O), 1,3-dioxolane (1,3-C3Ha02), and 1,4-dloxane (1,4-C4H802); the n -alkanes were -decane and n-tetradecane. VE for 1,4-dloxane + n-heptane was determined for 298.15 K only. All excess volumes are positive. Ve(x4 = 0.5) for any mixture containing an mc-membered cyclic dlether Is considerably larger than for the corresponding mixture (i.e., with the same n-alkane) Involving an mc-membered cyclic monoether.For a given ether, VE shows a pronounced Increase with Increasing chain length of the n -alkane.

Thermodynamic properties of binary mixtures of tetrahydropyran with pyridine and isomeric picolines: Excess molar volumes, excess molar enthalpies and excess isentropic compressibilities

“…The purities of the purified liquids were checked by measuring their densities (recorded in Table 1) using Anton Parr DSA 5000 at 298.15 ± 0.01 K. These values agreed to within ±2 × 10 −3 kg m −3 with their literature values [6,7]. Excess molar enthalpies, H E for the studied mixtures were measured by a 2-drop calorimeter (model, 4600) supplied by the Calorimeter Sciences Corporation (CSC), USA at 308.15 K in a manner described elsewhere [8].…”

Isothermal Vapor–Liquid Equilibria and Excess Gibbs Energies for Binary Mixtures of Cyclic Ethers with 1,2-Dichloroethane

“…1,3-DOXO (>99%), 1,4-DOXA (>99%), THP (>99%), and 1,2-DCE (>99.8%) were purchased from Acros Organics. The chemical purities were checked by comparison of measured vapor pressures and densities with literature values − as reported in Table . All the chemicals were used without any additional purification.…”

“…References cited for literature data: ref , Hernandez, V. G. (2005); ref , Brocos, P. (1998); ref , Giner, B. (2007); ref , Inglese, A. (1983); ref ,Barhala, A.…”

Thermodynamic Studies of Molecular Interactions in Mixtures Containing Tetrahydropyran, 1,4-Dioxane, and Cyclic Ketones

“…33 The standard uncertainty in temperature measurement is 0.01 K. The measured densities ρ, speeds of sound u, and heat capacities C P , of purified liquids at studied temperatures are listed in Table 2 and also compared with the literature values. [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]56 The excess molar enthalpies, H E , heat capacities, C P of (1 + 2) mixtures and molar heat capacities of pure liquids were measured as a function of composition in a microdifferential scanning calorimeter [model-μ DSC 7 EVO] that has been described elsewhere. 50,51 The calorimeter uses a double-temperature control peltiercooler and works between 228.15 to 393.15 K. A constant sweeping of nitrogen gas for about 4 h (0.3−0.4 MPa pressure) was supplied to avoid steam condensation in the calorimetric walls, and 0.08 MPa pressure of nitrogen gas was maintained after this period.…”

“…The working frequency for density and sound analyzer is 3 MHz . The standard uncertainty in temperature measurement is 0.01 K. The measured densities ρ, speeds of sound u , and heat capacities C P , of purified liquids at studied temperatures are listed in Table and also compared with the literature values. − , …”