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Evaluation of Cubic EOS Models in near Critical Regions of n-Alkanes |
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PP: 777-782 |
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Author(s) |
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Jibeom Kim,
Joonhyeon Jeon,
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Abstract |
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| The purpose of this paper is to evaluate the prediction accuracy and thoroughness of four
well-known Cubic Equation Of State (CEOS) models, which are called Peng-Robinson (PR),
Modified Peng-Robinson (MPR), Modified Redlich-Kwong (MRK) and Generalized van der Waals
(GvdW), to represent pressure of ten pure n-alkane molecules (with a general formula CnH2n+2 ,
n=1,2,3, ... ,8,10,12) near their critical regions. The performance evaluation results show that in the
critical region near the critical point, all four CEOS models have a prediction accuracy that gives
results quantitatively similar to the experimental vapor-pressure data, while in the critical region far
from the critical point, MPR and MRK give more accurate predictions of vapor pressure than PR and
GvdW. In contrast, beyond the critical region, GvdW provides much more accurate and reliable
predictions of pressure than the other CEOS models. Especially, it is found that GvdW accurately
reproduces the experimental pressure data in and beyond the critical region as the molecular size of
the n-alkanes increases. The performance evaluation of the CEOS models through this approach
gives an additional insight into the physical significance of an accurate prediction in and beyond the
critical region for pure alkane molecules with linear carbon chains. |
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