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

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, κ s E , excess speeds of sound, u E , excess molar isentropic compressibility, K s , m E , thermal expansion coefficient, α p , excess thermal expansion coefficient, α 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 m E findings were compared through the usage of theoretical model developed by Prigogine–Flory–Patterson (PFP). [ABSTRACT FROM AUTHOR]