Densities and Excess Molar Volumes of Binary Mixtures Constituted by 2,5-Dimethylfuran + Octane, Nonane, Decane, or Dodecane from 293.15 to 353.15 K

Abstract

The need for alternatives to fossil fuels motivates the study of compounds and mixtures with potential applications in an eventual energetic transition. Densities of binary mixtures comprising 2,5-dimethylfuran and four alkanes (octane, nonane, decane, and dodecane) were determined by using a U-shaped vibrating tube densimeter. The study was carried out at temperatures from 293.15 to 333.15 K, considering intervals of 5 K. The pressure was the atmospheric pressure of 0.078 MPa. The binary mixtures were prepared for the whole range of composition, at intervals near 0.1 in mole fraction. Isobaric thermal expansion coefficients were calculated, and their variation with respect to temperature and the alkane were examined. Excess molar volumes of the mixtures were obtained, resulting in positive deviations from ideality for the four systems. A relation between the magnitude of the deviation and the size of the alkane was observed. An empirical approach to modeling the excess molar volume, the Redlich–Kister correlation, was applied. Additionally, the theoretical model, the Prigogine–Flory–Patterson (PFP) model, was fitted to the excess molar volume data. The PFP model parameter was analyzed, and a relation with the size of the alkanes was found. The values of the parameters were of an order that agrees with the nature of the compounds in this work. Both approaches resulted in good agreement with the data and their suitability.