The petroleum industry relies heavily on performing simulations in order to test and optimize processes prior to the manufacturing of gasoline. Measuring the TVP is probably more conducive for determining the concentration of combustion contaminants emitted into the atmosphere since a maximum threshold has been imposed for the VP of gasoline in order to restrict air pollution. It differs from the true vapor pressure (TVP) which is described as the pressure exerted by a vapor in equilibrium with its liquid phase at a specific temperature. The RVP is the absolute vapor pressure exerted by a mixture as determined at a temperature of 100˚F (37.8˚C/311.0K) and a vapor to liquid ratio of 4:1. The protocol and apparatus for acquiring the RVP are well described in ASTM D-323. The Reid vapor pressure (RVP) is typically the measurement of choice for ascertaining the volatility of commercial gasoline in the refinery industry. There are a number of methods for determining the VP and they are somewhat time- consuming. The VP of gasoline is also vital for predicting the concentration of volatile compounds discharged into the atmosphere via the combustion of the fuel.

Thus, high volatility is a prerequisite for a gasoline to ensure sufficient engine start-up, warm-up and acceleration under routine driving and flying conditions. The VP is critically important for both automotive and aviation gasoline this is due to these fuels being manufactured as liquids, but consumed in the vapor phase. It is refined product of crude oil consisting of a mixture of hydrocarbons, additives, and blending agents. Gasoline is a petroleum fuel that is highly volatile. The vapor pressure (VP) is a key physical property of automotive gasoline as well as aviation fuels. These favorable comparisons strengthen the capacity of our system for acquiring the VP data for pure and volatile multi-component mixtures.Īutomotive gasoline is a major product manufactured by the petroleum industry. The empirical results for n-heptane and n-octane were also in excellent agreement with the literature. K) were also determined after acquiring VP data for the two VOCs.K) and n-octane (39.1 kJ/mol and 98.3 J/mol.The enthalpy and entropy of vaporization of n-heptane (37.2 kJ/mol and 100.1 J/mol , 2007), which produced a ΔH vap values of 37.3 kJ/mol and 35.4 kJ/mol. The value of ΔH vap was in excellent agreement with the findings of a prior study (Balabin et al. The results of this investigation yielded a ΔH vap value of 35.1 kJ/mol and ΔS vap of 102.5 J/mol The empirical data were used to predict the thermodynamic entities the enthalpy of vaporization ( ΔH vap ) and the entropy of vaporization ( ΔS vap ) of gasoline. The vapor pressure (VP) of 87 grade gasoline was measured using an enhanced VP acquisition system over a temperature range of approximately 19.0℃ (292.2 K) and 69.0℃ (342.2 K).

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