Abstract
A new simple and accurate functional form for an attractive parameter α is introduced for Peng–Robinson equation of state. The modified Peng–Robinson equation of state is applied to calculate the density of different pure heavy hydrocarbons. The performance of this proposed equation of state for density calculations is examined with the corresponding experimental measurements and the results are compared with those obtained from the original Peng–Robinson equation of state. The new alpha function allows significant improvements of prediction of density. The overall average absolute deviation percentage of the calculated density of 12 heavy hydrocarbons obtained by this modified equation of state is 0.35%.
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