“Dew points of wet gas mixtures: new data and a new correlation using interaction third virial coefficients”

Abstract

Simultaneous and thermodynamically consistent measurements of gas densities and dew points for wet natural gas systems, both sweet and sour, are presented from 348.15 - 483.15 K. For each temperature, the dew-point pressure and the second and third virial coefficients are measured independently . Comprehensive, similar measurements for the CO 2/H 2O binary at five different compositions plus pure steam densities will appear in future publications. In conjunction with these data, a new wet gas dew-point estimation method is developed using (1) a third virial Leiden EOS (equation of state) to represent the gas mixture and (2) Henry's constants or inifinte dilution activity coefficients to represent the first drop of liquid, which is mainly water. Our estimation routine accepts experimental B ij, C ijk and H ij/γ ∞ i when available but otherwise estimates these coefficients from other, well-known correlations.