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01-Applied Mathematics & Information Sciences
An International Journal


Volumes > Volume 6 > No. 6-3S


Evaluation of Cubic EOS Models in near Critical Regions of n-Alkanes

PP: 777-782
Jibeom Kim, Joonhyeon Jeon,
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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