Densities, Sound Velocities, and Refractive Indexes of Tetralin + <i>n</i>-Hexadecane at (293.15, 303.15, 313.15, 323.15, 333.15, and 343.15) K

Abstract

Mixtures of tetralin (1,2,3,4-tetrahydronaphthalene), an aromatic cyclic molecule, and n -hexadecane present asymmetries in chemical nature, shape, and chain length and are frequently found in kerosene and diesel fractions. Aiming at understanding the impact of these asymmetries on some thermophysical properties, this work presents densities, sound velocities, and refractive indexes for this binary system along with the properties of the pure components at (293.15, 303.15, 313.15, 323.15, 333.15, and 343.15) K over whole composition range and at atmospheric pressure. From these data, molar refractivity and excess volume were obtained. Several sound velocity mixing rules were tested, and the best result was for the Wada mixing rule. Pure component densities and sound velocities were correlated with the Prigogine–Flory–Patterson (PFP) model. The binary interaction parameter for this model was obtained from correlation of excess volumes. This model calculated experimental mixture densities very well and calculated reasonably good mixture sound velocities. A negative and high binary interaction parameter allowed us to describe positive excess volume.