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A simple method, requiring the characterization factor as the only input, is proposed to predict the enthalpies of the liquid and vapor petroleum fractions over a wide range of temperatures and pressures. This method showed a comparable accuracy in the prediction of the petroleum fraction enthalpy with much more complicated predictive methods in the literature. The proposed method gave overall deviations of ±2.48% when tested on the data for liquid fractions and ±1.23% when tested on the data for vapor fractions.

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