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Application of the Advanced Distillation Curve Method to the Aviation Fuel Avgas 100LL

2009; American Chemical Society; Volume: 23; Issue: 4 Linguagem: Inglês

10.1021/ef8011189

1520-5029

Tara M. Lovestead, Thomas J. Bruno,

Thermodynamic properties of mixtures

We have recently introduced several important improvements in the measurement of distillation curves for complex fluids. First, we incorporate a composition explicit data channel for each distillate fraction (for qualitative, quantitative, and trace analysis). Moreover, the temperature, volume, and pressure measurements are of low uncertainty, and the temperatures are true thermodynamic state points that can be modeled with an equation of state. These two features make the measurements suitable for equation of state development. The approach also provides consistency with a century of historical data, an assessment of the energy content of each distillate fraction, and, where needed, a corrosivity assessment of each distillate fraction. The most significant modification is achieved with a new on-the-fly sampling approach that allows precise qualitative identification as well as quantitative analyses of each fraction. We have applied this new method, the advanced distillation curve method, to the measurement of rocket propellant, diesel fuels, gasoline, and jet fuels. In this paper, we apply this method to low-lead aviation gasoline, avgas 100LL, and compare the results with those for 91 AI (antiknock index) motor gasoline. We present the distillation curves and track the composite enthalpy of combustion and the molar concentration of tetraethyl lead throughout the distillation.