Continuous thermodynamic correlation and calculation of vapor pressure and vapor–liquid equilibrium constant of hydrocarbon fuel fractions

To quantitatively predict the vapor–liquid equilibrium characterization of hydrocarbon fuel fractions, continuous thermodynamics with the Gaussian distribution function to represent the composition of each fuel fraction is applied to correlate the experimental vapor pressure data. The vapor and liquid phase distribution functions, the vapor–liquid equilibrium constants of the component characterized by the normal boiling-point under different bubble-point conditions are calculated. It can be observed that the continuous thermodynamic method is a suitable tool for the correlation of vapor pressure data and the description of vapor–liquid equilibria of the multicomponent systems such as fuel fractions.