(378l) Compressed Liquid Densities of Octane + Decane and Thiophene + Octane + Decane Mixtures at Temperatures up to 363.15 K and Pressures from 1 to 25 Mpa

The thermodynamic properties PρT (pressure, density and temperature) obtained experimentally are fundamental to develop empirical and theoretical models necessary to represent and/or predict the behavior of fluids. Precise knowledge of density at different temperature and pressure intervals must be available to create a better representation and understanding to later apply it in the development of industrial processes. Other sources have studied and modeled the density and other properties of n-alkanes at high pressure and at different temperature ranges. These studies have several applications in industrial separation processes, such as oil production and refining, distillation, absorption, liquid-liquid extraction, etc. In this work, the experimental density data (ρ) of octane + decane and thiophene + (octane + decane) mixtures are reported in temperature ranges (T) from 313.15 to 363.15 K and pressure (P) from 1 to 25 MPa. The measurements were carried out with a relative expanded uncertainty (coverage factor k = 2) of 0.19 % in density considering the impurities of the chemical compounds. The standard combined uncertainties in composition, temperature and pressure are u_c (x) = 0.003 mol/mol, u_c (T) = 0.03 K and u_c (P) = 0.007 MPa respectively. These experimental data on the density of the mixture were represented with the Pimentel-Galicia model for each composition, adjusting the parameters of the previously mentioned model to the experimental data of PρT , obtaining a maximum absolute percentage deviation (MAPD) of 0.05 % in the range of measurement of P and T. Subsequently, the isothermal compressibility and isobaric thermal expansivity are reported from the Pimentel-Galicia model adjusted to experimental P and T. Finally, the excess molar volume values of the experimental data are reported, taking experimental density information of the pure compounds from previous research work developed in this research laboratory.