Thermodynamic study of oxygenised fuel additives (isomeric butanediols with ethyl acetate) at 298.15-323.15K

ABSTRACT

Densities, ρ, and Speeds of Sound, u, were measured for pure liquids of ethyl acetate, (EtOAc), 1,2-butanediol, (1,2-BD), 1,3-butanediol, (1,3-BD), 1,4-butanediol, (1,4-BD) and their binary mixtures {x₁ EtOAc + x₂1,2-BD}, { x₁ EtOAc + x₂1,3-BD}, and { x₁ EtOAc + x₂1,4-BD} over the composition (EtOAc) and at temperatures (298.15–323.15) K at pressure 0.1 MPa. To understand the molecular interactions of solute–solvent, measured excess properties such as the excess molar volume, $V_m^E$, excess isentropic compressibility, ${\kappa }_s^E$, excess speeds of sound, $u^{\mathrm{E}}$, excess molar isentropic compressibility, $K_{\mathrm{s},\mathrm{m}}^{\mathrm{E}}$, thermal expansion coefficient, ${\alpha }_p$, excess thermal expansion coefficient, ${\alpha }_p^E$ were calculated and fitted using the Redlich–Kister equation. For better understanding, also calculated partial molar volumes/isentropic compressibilities, and their excess properties at infinite dilution were measured. These parameters have been used to understand the interactions in the mixtures qualitatively. The experimental $V_{\mathrm{m}}^{\mathrm{E}}$ findings were compared through the usage of theoretical model developed by Prigogine–Flory–Patterson (PFP).

KEYWORDS:

• Ethyl acetate
• α
• ω-alkanediol
• density
• speed of sound
• binding interactions
• PFP theory

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

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