Densities, viscosities, and isobaric heat capacities of the system (1-butanol + cyclohexane) at high pressures

Abstract

The cyclohexane and the system of 1-butanol+cyclohexane have been characterized using densities, viscosities and isobaric heat capacities measurements. For that, the densities were measured in a high-pressure vibrating tube densimeter at five temperatures from (293.15 to 333.15)K and pressures up to 100MPa. The measurements were correlated with the empirical Tamman–Tait equation.Moreover, the isobaric heat capacities of the binary system were measured in a high-pressure automated flow calorimeter at T=(293.15 and 313.15)K and pressures up to 25MPa for pure cyclohexane and in admixture with 1-butanol. The excess molar heat capacities were assessed for the mixture and a positive deviation from the ideality was obtained, except for a small part in the region rich in alkanol.The viscosity measurements were carried out, at the calorimeter conditions, for correcting the experimental values of isobaric heat capacities due to friction along the tube. The viscosity was measured at atmospheric pressure in a Stabinger Anton Paar SVM 3000 viscometer in the temperature range of (293.15 to 333.15)K for cyclohexane and the mixtures. At high pressure, the viscosities were estimated using Lucas method.