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Abstract
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.
NOMENCLATURE
| A | = | mole fraction (CO2 + H2S) |
| B | = | mole fraction H2S |
| %E | = | percentage error |
| Mw | = | molecular weight |
| (VP) | = | vapor pressure, Mpa |
| Pc | = | critical pressure |
| Pr | = | reduced pressure, P/Pc, Mpa |
| Pc′ | = | pseudo-critical pressure, Kay's mixing rule, Mpa |
| Pc” | = | pseudo-critical pressure adjusted for sour gas (Wichert and Aziz, 1972), Mpa |
| R | = | universal gas constant, 8.314 J/mol.K |
| T | = | temperature |
| Tc | = | critical temperature |
| Tr | = | reduced temperature |
| Tc′ | = | pseudocritical pressure, Kay's mixing rule, K |
| Tc” | = | pseudocritical pressure adjusted for sour gas (Wichert and Aziz, 1972), K |
| V | = | molar volume, M3/mol |
| yi | = | mole fraction of component, “i” |
| ϵ | = | sour natural gas correction factor (Wichert and Aziz, 1972) |
| ω | = | acentric factor |