Density, Viscosity, Speed of Sound, Surface Tension, and Flash Point of Binary Mixtures of n-Hexadecane and 2,2,4,4,6,8,8-Heptamethylnonane and of Algal-Based Hydrotreated Renewable Diesel

The physical properties of algal hydrotreated renewal diesel (algal HRD) and several binary mixtures of n -hexadecane and 2,2,4,4,6,8,8-heptamethylnonane were measured in this work. The density and viscosity were measured at temperatures ranging from (293.15 to 393.15) K and the pure components values fell within the range of previously reported values. Speed of sound data were measured at temperatures ranging from (293.15 to 323.15) K and ranged from (1170 to 1360) m·s –1 . The bulk modulus was calculated from the density and speed of sound data, and its values ranged from (1050 to 1425) MPa. For the pure n -hexadecane and 2,2,4,4,6,8,8-heptamethylnonane and their mixtures, the flash point values ranged from (367 to 408) K and the surface tension values ranged from (24.1 to 27.3) mN·m –1 . The values of viscosity and flash point (360 K) for the algal HRD did not fall within the range of values for the mixtures of n -hexadecane and 2,2,4,4,6,8,8-heptamethylnonane, but the values of density, speed of sound, bulk modulus, and surface tension (26.0 mN·m –1 ) did fall within the range of values measured for the mixtures of n -hexadecane and 2,2,4,4,6,8,8-heptamethylnonane. These data are important for future modeling of these renewable fuels.