Prediction of volumetric properties of some fatty acid methyl esters, biodiesel fuels and their blends using perturbed Yukawa hard-core chain equation of state

Abstract

In this paper, a perturbed Yukawa hard-core chain (PYHCC) equation of state (EOS) has been employed for predicting the volumetric properties of some fatty acid methyl esters (FAMEs) and methyl ester-based biodiesel fuels and their blends. Three pure-component parameters appear in the PYHCC EOS, which reflect the chain-length, dispersive energy parameter and hard-core diameter of Yukawa fluid. These parameters have been determined by fitting of 56 experimental density data at ambient pressure. The performance of the proposed model has been assessed by predicting 1165 density data over pressure range from 0.1 to 130MPa and temperature range from 278.4 to 396K, for which their measured values were available in the literature. The overall average absolute deviation (AAD) of the correlated and predicted densities of studied FAMEs and biodiesels from literature data were found to be 0.26% and 0.52%, respectively. The isothermal compressibility (κT) coefficients have also been estimated by the use of proposed perturbed hard-chain equation of state (PHC EOS) and the results have been compared with those obtained from Tait equation; from 596 data points examined, AAD was found to be 2.60%. Besides, we have extended the mixture version of the proposed PHC EOS to binary and ternary blends formed by methyl ester-based biodiesels for predicting their volumetric properties. Our prediction accuracy has been checked by taking 406 experimental data points for above-mentioned blends, AAD was found to be 0.43%.