Virial Tsonopoulos method

Since reduced pressure is below 0.4, use virial equation (2-67 ). Calculate B by tbe Tsonopoulos method, Eq. (2-68). 

Calculate the second virial coefficient of N2 at 150 K using the Tsonopoulos method Physical properties of N2 ... 

Search for experimental second virial coefficients for nitrogen in the DDB using the DDBSP Explorer Version. Compare the values to the estimation results from the Tsonopoulos method via DDBSP-Predict. Estimate the Boyle temperature from the experimental findings. 

Second virial coefficients, B, are a function of temperature and are available for about 1500 compounds in the DIPPR compilation. The second virial coefficient can be regressed from experimental PVT data or can be reasonably and accurately predicted. Tsonopoulos proposed a prediction method for nonpolar compounds that requires the critical temperature, critical pressure, and acentric factor. Equations (2-68) through (2-70) describe the method. 

For nonassociating molecules, the methods of Tsonopoulos [14] and Hayden and O Connell [15] yield pretty good results for the estimation of the second virial coefficient. The first method works with the three-parameter corresponding-states principle (Section 2.4.4) the second method takes into account several molecular effects. In case of vapor phase association (Section 13.2), the model of Hayden-O Connell is extended by a chemical equilibrium term, whose parameters have to be fitted to experimental data. 

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