SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (8): 894-900.

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

Fakhri Yousefi1, Hajir Karimi2, Mohammad Mehdi Papari3

1. 1 Department of Chemistry, Yasouj University, Yasouj, 75914-353, Iran;
2 Department of Chemical Engineering, Yasouj University, Yasouj, 75914-353, Iran;
3 Department of Chemistry, Shiraz University of Technology, Shiraz 71555-313, Iran
• Received:2012-03-11 Revised:2012-10-08 Online:2013-08-24 Published:2013-08-28

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

Fakhri Yousefi1, Hajir Karimi2, Mohammad Mehdi Papari3

1. 1 Department of Chemistry, Yasouj University, Yasouj, 75914-353, Iran;
2 Department of Chemical Engineering, Yasouj University, Yasouj, 75914-353, Iran;
3 Department of Chemistry, Shiraz University of Technology, Shiraz 71555-313, Iran
• 通讯作者: Fakhri Yousefi

Abstract: 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 C9 to C20 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.