Density, Excess Volumes, and Partial Volumes of Binary Mixtures of Soybean Biodiesel + Diesel and Soybean Biodiesel + n-Hexadecane at Different Temperatures and Atmospheric Pressure

• Published in: Journal of chemical and engineering data Vol. 56; no. 1; pp. 153 - 157
• Main Authors: Mesquita, Francisca M. R, Feitosa, Filipe X, Santiago, Rilvia S, de Sant’Ana, Hosiberto B
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 13-01-2011
• Subjects: Applied sciences; Biofuel production; Biological and medical sciences; Biotechnology; Crude oil, natural gas and petroleum products; Energy; Exact sciences and technology; Fuels; Fundamental and applied biological sciences. Psychology; Industrial applications and implications. Economical aspects; Prospecting and production of crude oil, natural gas, oil shales and tar sands; Binary mixture; Hydrocarbon; Atmospheric pressure; Diesel fuel; Molar volume; Excess parameter; Biofuel; Soybean; Thermodynamic properties; Density; Physical properties; Hexadecane
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/je100721c

Densities, ρ, of binary mixtures of diesel + soybean biodiesel and n-hexadecane + soybean biodiesel have been measured as a function of the composition at different temperatures (293.15, 313.15, 333.15, 353.15, and 373.15) K and atmospheric pressure, over the entire composition range, using an Anton Paar SVM 3000 oscillating U-tube densimeter. The excess molar volume, V E, and excess partial molar volume, V̅ E, of the binary mixtures were calculated from the density data. These data have been correlated using the Redlich−Kister type function in terms of mass fraction (w), with a maximum standard deviation of 0.152 cm3·mol−1. The excess volumes are positive for the soybean biodiesel + diesel system. The values of the excess volume for the system soybean biodiesel + n-hexadecane are also positive and an inversion of sign in V E is observed at higher molar fractions of soybean biodiesel (around x 1 = 0.60 to 0.80). The excess partial volume at infinite dilution has been also calculated.