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An Investigation of the Comparative Performance of Diverse Vapor Pressure Prediction Techniques of Sour Natural Gas

In this study, the Antoine equation was modified for vapor pressure prediction to estimate and compute accurate vapor pressure of sour natural gases mixtures for given temperature range by applying the software MATLAB 8.2 R2013b (The MathWorks, Natick, MA). The calculated vapor pressures were compared with the well-known and widely used techniques to have near-accurate description of the vapor pressure estimation for sour natural gas, such as a cubical equation of state (Soave–Redlich–Kwong) and with the Wichert and Aziz (1972) correction technique for sour natural gas properties. The predicted vapor pressures were very close to those obtained by the mentioned two techniques with an average of absolute deviations of 1.954% and coefficient of determination 0.99.