VApour‐liquid equilibria systems: Hexane‐hexylalcohol and heptane‐hexylalcohol

Abstract

Isobaric vapour‐liquid equilibrium data have been determined for the binary systems hexane‐hexylalcohol and heptane‐hexylalcohol at 760 mm of Hg total pressure, using a Scatchard and Ticknor still. The isobaric vapour‐liquid equilibria of both the systems have been correlated satisfactorily by the equations of Redlich & Kister as modified by Chao despite the wide variation in boiling points. Ewell et al.1 have classified liquids into five groupings based on their properties of forming hydrogen bonds. According to this classification, hydrocarbon‐alcohol combinations involve breaking of hydrogen bonds and always show positive deviations. A systematic study of the vapour‐liquid equilibrium data of these has been attempted and the present work presents the results.

Modeling Interfacial Tension of Heptane + Alcohol Mixtures Using Cubic Plus Association Equation of State Plus Simplified Gradient Theory

“…For the heptane + ethanol mixture at 303.27 K, the binary interaction parameter was calculated using experimental phase equilibrium from Berro et al [29]. For the heptane + 1-propanol mixture, a linear correlation of the binary parameter with temperature was obtained in the temperature range of 298.15 K to 333.15 K; this correlation was obtained with experimental phase equilibrium from Sayegh et al [30] at 298.15 K, Pradhan et al [31] at 303.15 K, and Van Ness et al [32] at 333.15 K. For the heptane + 1-butanol mixture, a linear correlation of the binary parameter with temperature was obtained in the temperature range of 303.15 K to 323.15 K; this correlation was obtained with experimental data from Powell et al [33] at 303.15 K, Belabbaci et al [34] at 313.15 K, and Smith and Engel [35] at 323.15 K. For the heptane + 1-hexanol mixture, only isobaric phase equilibrium information at 1 atm was found in the literature; this experimental information was obtained from Rao et al [36]. Finally, for the heptane + 1-octanol mixture, a linear correlation of the binary parameter was obtained in the temperature range of 293.15 K to 353.15 K; this correlation was obtained with experimental information from Góral et al [37] at 293.15 K, 313.15 K, and 353.15 K.…”

“…Figure4: Phase envelope of the heptane + 1-hexanol mixture at 1 atm with CPA-EOS (Lines: theoretical results and Symbols: experimental data). (•) 1 atm from Rao et al[36], (---) using k ij = optimal at 1 atm.…”