Equation for the Poynting correction for thermodynamic equilibrium in gas phase non-polar-aqueous systems. Application to the H2S-H20-NaCl system [Ecuación para la corrección poynting en termodinámica de equilibrio de fases gases no polar
Por:
Reyes J.M., Pérez R.J., Partida E.G., Michel J.A.T.
Publicada:
1 ene 2010
Categoría:
Earth and Planetary Sciences (miscellaneous)
Resumen:
In this paper we used the semitheoretical expression for the partial molar volume at infinite dilution of volatile aqueous non-electrolyte solute (V20), developed by Plyasunov et al. (2000b) in order to propose a new equation for Poynting correction. The mathematical formula V20 considers as variables the density and isothermal compressibility of the solvent, as well as the second cross solvent-solute virial coefficient (?12) and the second virial coefficient of pure solvent (?11). The equation was integrated analytically with respect to pressure using some auxiliary correlations found in the literature, and thereby obtain a mathematical expression of the isothermal pressure increment of the standard (infinite dilution) Gibbs energy (or chemical potential) of the solute (?G20). The mathematical equation is applicable to solutes whose ?12 is known or can be estimated, in a temperature range of 273.16 K to 647 K, values of pressure up to 2 kbar and brines with ionic strength equal to 6 m NaCl. The expression fits the experimental data very well, as shown for the H2S-H2O-NaCl system (with maximum deviation of 7%), through a thermodynamic model that uses this formula proposal coupled with the Law of Henry and the Soave-Redlich-Kwong equation of state for modeling the liquid-vapor phase equilibria. Similarly, we propose an alternative expression for calculating V20 (with similar values of maximum deviation).
Filiaciones:
Reyes J.M.:
Centro de Geociencias, Universidad Nacional Autónoma de México Campo de Juriquilla, Qro., México, apartado postal 76230, Mexico
Pérez R.J.:
Department of Chemical and Petroleum Engineering, University of Calgary, 2, 500 University Drive, Calgary AB, T2N 1N4, Canada
ExxonMobil Upstream Research Company, 3120 Buffalo Speedway, TX 77098, Houston, United States
Partida E.G.:
Centro de Geociencias, Universidad Nacional Autónoma de México Campo de Juriquilla, Qro., México, apartado postal 76230, Mexico
Michel J.A.T.:
Centro de Geociencias, Universidad Nacional Autónoma de México Campo de Juriquilla, Qro., México, apartado postal 76230, Mexico
All Open Access, Gold
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