Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The composition of Navy Jet fuel JP-5 was determined using gas chromatography(GC)-electron impact mass spectrometry and GC*GC/(Flame ionization detection) to contain by mass 21 % linear alkanes, 29 % cycloalkanes, 32 % isoalkanes, and 18 % aromatic compounds. Various quaternary mixtures of n-dodecane, n-butylcyclohexane, nbutylbenzene, and 2,2,4,4,6,8,8-heptamethylnonane were prepared as possible surrogates for this jet fuel and analyzed for density and viscosity (253 to 333 K), speed of sound (288 to 333 K), surface tension (294 +- 1 K), and flashpoint. Relative percent deviation cutoffs for matching the JP-5 based on previous studies and fuel specification were: +- 1.7 % for density, +- 1 % for speed of sound, +- 3.5 % for bulk modulus, +- 2.6 % for viscosity, +- 2.2 % for surface tension, and +- 10 % for flash point (minimum of 333 K). Seven quaternary mixtures met these cut-offs. Three had compositions that were comparable to the JP-5 and would be good candidates for engine testing. All mixture excess molar volumes showed a trend of increasing, reaching a plateau, and then decreasing as the concentration of n-butylbenzene increased. Viscosity deviations were at most +- 0.12 mPa*s and decreased with increasing temperature.