PVTx Properties of Liquefied Natural Gas mixtures Using Tao-Mason Equation of State

概要

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In our previous paper we extended the Tao and Mason equation of state (TM EOS) to refrigerant fluids using the speed of sound data. Here, we employed the TM EOS to predict volumetric properties of multi-component mixtures of liquefied natural gas (LNG). The second virial coefficient, B<sib>2(T), necessary for the mixture version of the TM EOS, in the absence of sufficient experimental data on B<sib>2(T), were calculated from the correlation proposed by Tsonopolous (AIChE J. 1978, 24, 1112). Analysis of our predicted results shows that the TM EOS is capable of accurately predicting the densities of multi-component liquefied natural gas mixtures over wide range of temperatures and pressures. The overall average absolute deviation (AAD) of the calculated densities from the literature ones for 222 data points was found to be 2.37%. Besides, the densities of LNG mixtures obtained from the TM EOS have been compared with those calculated from Peng- Robinson (PR) and Ihm-Song-Mason (ISM) equations of state. Generally, our results are in favor of the preference of the TM EOS over two other equations of state. The overall average absolute deviation for 222 data points calculated by ISM and PR equations of state were of the order of 2.90% and 4.85%, respectively.