Density and Viscosity of a Ternary $$ x_{1} $$ 1-Hexene(1) + $$ x_{2} $$ 1-Octene(2) + (1 − x − x ) 1-Decene(3) Mixture at High Temperatures and High Pressures.

The density and viscosity of a ternary 1-hexene(1) + 1-octene(2) +1-decene(3) mixture ( $$ w_{1} = w_{2} = w_{3} = 0.333 $$ weight fractions or $$ x_{1} = 0.4257 $$ , $$ x_{2} = 0.3190 $$ , $$ x_{3} = 0.2553 $$ mole fractions of 1-hexene, 1-octene, and 1-decene, respectively) have been simultaneously measured over the temperature range from (298 to 471) K and at pressures up to 196 MPa using a combined method of hydrostatic weighing and falling-body techniques, respectively. The combined expanded uncertainties of the density, pressure, temperature, concentration, and viscosity measurements at the 95% confidence level with a coverage factor of k = 2 are estimated to be (0.15 to 0.30)%, 0.05%, 0.02 K, 0.005 mol%, and (1.5 to 2.0)%, respectively. The measured densities and viscosities were used to calculate the excess molar volumes and viscosity differences. The excess molar properties ( $$ G_{\text{m}}^{\text{E}} , \, H_{\text{m}}^{\text{E}} , \, S_{\text{m}}^{\text{E}} $$ and $$ C_{\text{pm}}^{\text{E}} $$ ) and their pressure derivatives as a function of temperature and pressure have been calculated using the derived excess molar volumes. The measured viscosities were used to develop a theoretically based viscosity correlation model (Arrhenius-Andrade type equation) for the mixture. [ABSTRACT FROM AUTHOR]