K-values at essentially infinite dilution for carbon dioxide and hydrogen sulfide in the methane-n-octane system at low temperatures and elevated pressures

Abstract

Gas-liquid partition chromatography with the hypothetical perfect gas perturbation method was used to determine the infinite dilution K-values for carbon dioxide and hydrogen sulfide in the methane-n-octane system at 20°, 0°, -20°, and -40°C and at nine pressures from 20 to 1500 psia. Carbon dioxide and hydrogen sulfide showed positive deviation from Raoult's law.Vapor-liquid equilibrium data are needed for absorber calculations on natural gas systems to follow the distribution of naturally occurring nonhydrocarbon components. Infinite dilution data are useful not only for design calculations but also for the theoretical development of correlations. The data presented here are for the nonhydrocarbons carbon dioxide and hydrogen sulfide, each in the methane-ra-octane system at low temperature and high pressure. EXPERIMENTAL Method. Gas-liquid partition chromatography (GLPC) has proven satisfactory for vapor-liquid equilibrium measurements.

Vaporization Equilibrium Ratios for CO2 and H2S in Paraffinic, Naphthenic and Aromatic Solvents

“…Direct comparisons of the data of this work for C(>. ami ITS are possible with the data of Asano et al (1971) for the velen is where n-octane is the solvent. Figure 4 presents such a comparison, with the results from the static cell of this work and those of Asano being shown in terms of their deviations from the chromatographic K values of this work.…”

“…The time required for each solute to pass through the column was recorded, along with the temperature, pressure, and methane flow rate (measured by bubble meter). The K values were calculated by the following relationships, which have been described elsewhere (e.g., Asano et al, 1971;Stalkup and Kobayashi, 1963;Yudovich et al, 1971).…”

Propriétés thermodynamiques de systèmes contenant des gaz acides. Étude bibliographique

“…Lorsque les phases en équilibre peuvent être considérées idéales, c'est-à-dire lorsque les fugacités des constituants sont proportionnelles à leurs fractions molaires, on peut dire que les coefficients de partage, définis par : Composition des mélanges étudiés par Li et al (1994) Composition of the mixtures investigated by Li et al (1994) Asano et al (1971) (mélange méthane-n-octane) et Mundis et al (1977) (les mélanges C 1 -nC 7 ; C 1 -méthylcyclohexane ; C 1 -toluène et C 1 -nC 8 ) donnent par exemple des graphiques représentant ce coefficient de partage pour le CO 2 et le H 2 S. On constate qu'en réalité, ce coefficient est également fonction de la composition du système. La figure 13, reprise de Eakin et De Vanay (1974), montre cette fonction pour le H 2 S.…”

Application of BWR Equation to Infinite Dilution K-values for Carbon Dioxide and Hydrogen Sulfide in Methane-n-Octane System

“…The BWR equation2) is commonly written as (1) In Eqs. (3) and (4), the coefficient, mij or mjk, is the interaction coefficient between unlike molecules which has been introduced based on the suggestion of Stotler and Benedict14).…”