Extension of Tao-Mason Equation of State to Heavy n-Alkanes

• Published in: Chinese journal of chemical engineering Vol. 21; no. 8; pp. 894 - 900
• Main Authors: Yousefi, Fakhri, Karimi, Hajir, Papari, Mohammad Mehdi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2013
• Subjects: Density; Deviation; EOS; Equations of state; Freezing point; heavy n-alkanes; Ihm-Song-Mason equation of state; Liquids; Mathematical analysis; PVT特性; Refrigerants; Tao-Mason equation of state; Virial coefficients; 摄动理论; 梅森公式; 液体密度; 状态方程; 第二维里系数; 长链正构烷烃; heavy n-alkanes; density; Tao-Mason equation of state; Ihm-Song-Mason equation of state
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(13)60548-0

In our previous paper we extended the Tao and Mason equation of state （TM EOS） to refrigerant fluids, using the speed of sound data. This is a continuation for evaluating TM EOS in predicting PVT properties of heavy n-alkanes. Liquid density of long-chain n-alkane systems from C 9 to C 20 have been calculated using an analytical equation of state based on the statistical-mechanical perturbation theory. The second virial coefficients of these n-alkanes are scarce and there is no accurate potential energy function for their theoretical calculation. In this work the second virial coefficients are calculated using a corresponding state correlation based on surface tension and liquid density at the freezing point. The deviation of calculated densities of these alkanes is within 0.5% from experimental data. The densities of n-alkanes obtained from the TM EOS are compared with those calculated from Ihm-Song-Mason equation of state and the corresponding-states liquid densities （COSTALD）. Our results are in favor of the preference of the TM EOS over other two equations of state.