Viscosity and Density of C ₉ –C ₁₀ Aromatics at 223.15–323.15 K Relevant to Aviation Turbine Fuel

There are likely to be differences in the aromatic composition of fully formulated aviation turbine fuels compared to petroleum-derived fuels. In this study, the viscosity and density of a range of C9–C10 aromatic compounds were measured from 223.15 to 323.15 at 10 K intervals. It was of interest to determine whether the MacCoull kinematic viscosity–temperature relationship in ASTM D341 was generally valid for all aromatic compounds tested. As an internal check, the refractive index at 589 nm was measured over the temperature range 283.15–323.15 at 5 K intervals and is also reported. All measurements were performed on air-saturated compounds of known purity at a near-atmospheric pressure. It was found that the measured data for all compounds was described by the MacCoull relationship with correlation coefficients r2 ≥ 0.996. Liquid density changed linearly with temperature, with r2 ≥ 0.999, even in data sets including measurements near the freezing point temperature. Refractive index changed linearly with temperature, r2 ≥ 0.999, and temperature invariant molar refractivity calculated using the Eykman relationship had a relative standard deviation of ≤0.04%.