Effects of temperature and concentration on interactions in methanol + ethyl acetate and ethanol + methyl acetate or ethyl acetate systems: Insights from apparent molar volume and apparent molar isentropic compressibility study

摘要

The density (d) and speed of sound (u) for the binary systems (methanol + ethyl acetate) and (ethanol + methyl acetate or ethyl acetate) were measured at 298.15,303.15,308.15 and 313.15 K and at atmospheric pressure in this work whereas the system (methanol + methyl acetate) was measured in the literature. The apparent molar volume, V_φ, isentropic compressibility, ks, and apparent molar isentropic compressibility, k_φ, have been calculated using density and speed of sound data, respectively. The limiting apparent molar volume, V_φ~0 and limiting apparent molar isentropic compressibility, K_φ~0 were found by extrapolation to infinite dilution using the Redlich-Mayer equation. The limiting apparent molar volume was used to obtain information about (solute-solvent) and (solute-solute) interactions. The temperature dependence of apparent molar volumes were used to calculate the apparent molar expansibility, and Hepler's constant, (?~2V_φ~0/?T2)_p. The isobaric thermal expansion coefficient,α_P, was also calculated. Positive k_φ~0 values for all binary systems can be attributed to the predominance of solvent intrinsic compressibility over the solute intrinsic effect.