High pressure density for dodecane + biodiesel produced from residuals from cooking oil and beef tallow: Experiments and correlation with a proposed global (p, T, x) Tammann-Tait base model Academic Article in Scopus uri icon

abstract

  • Thermophysical properties under high pressure and high temperature of biodiesel are mainly available for samples with methyl ester base constituents produced from vegetable oils. Besides, the behavior of these biofuels blended with additives such as alkanes is of great importance in order to understand their molecular interactions. Therefore, this research is aimed at two main contributions: (I) the experimental determination of densities for two dodecane + biodiesel systems and (II) the modelling of the experimental density sets by an approach based on the Tammann-Tait equation with global parameters dependent on pressure, temperature and composition. Two biodiesel samples were produced from transesterification of waste cooking oil with methanol, and waste beef tallow with ethanol. Density was measured in a vibrating tube densimeter (VTD). The dodecane + waste cooking oil methyl ester biodiesel system was explored at xC12 = 0, 0.1000, 0.1511, 0.2014, 0.2502, 0.3004 and 1.000; while the dodecane + waste beef tallow ethyl ester biodiesel system was evaluated at xC12 = 0, 0.1000, 0.3000, 0.5012, 0.7001, 0.9002 and 1.000. The proposed model yielded 0.4 kg·m¿3 of standard deviation; these deviations were lower compared with those from other semiempirical models proposed in the literature. Moreover, the model was capable to estimate the isothermal compressibility and the thermal expansion coefficients. © © 2025. Published by Elsevier Ltd.

publication date

  • January 1, 2026