Phase Equilibria of the CH 4 -CO 2 Binary and the CH 4 -CO 2 -H 2 O Ternary Mixtures in the Presence of a CO 2 -Rich Liquid Phase

Ludovic Nicolas Legoix, Livio Ruffine, Jean-Pierre Donval and Matthias Haeckel
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Ludovic Nicolas Legoix: GEOMAR, Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, D-24148 Kiel, Germany
Livio Ruffine: Institut Français de Recherche pour l’Exploitation de la Mer (IFREMER), Centre de Bretagne, Département Ressources physiques et Ecosystèmes de fond de Mer, Unité des Géosciences Marines, BP70, 29280 Plouzané, France
Jean-Pierre Donval: Institut Français de Recherche pour l’Exploitation de la Mer (IFREMER), Centre de Bretagne, Département Ressources physiques et Ecosystèmes de fond de Mer, Unité des Géosciences Marines, BP70, 29280 Plouzané, France
Matthias Haeckel: GEOMAR, Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, D-24148 Kiel, Germany

Energies, 2017, vol. 10, issue 12, 1-11

Abstract: The knowledge of the phase behavior of carbon dioxide (CO 2 )-rich mixtures is a key factor to understand the chemistry and migration of natural volcanic CO 2 seeps in the marine environment, as well as to develop engineering processes for CO 2 sequestration coupled to methane (CH 4 ) production from gas hydrate deposits. In both cases, it is important to gain insights into the interactions of the CO 2 -rich phase—liquid or gas—with the aqueous medium (H 2 O) in the pore space below the seafloor or in the ocean. Thus, the CH 4 -CO 2 binary and CH 4 -CO 2 -H 2 O ternary mixtures were investigated at relevant pressure and temperature conditions. The solubility of CH 4 in liquid CO 2 (vapor-liquid equilibrium) was determined in laboratory experiments and then modelled with the Soave–Redlich–Kwong equation of state (EoS) consisting of an optimized binary interaction parameter k ij (CH 4 -CO 2 ) = 1.32 × 10 ?3 × T ? 0.251 describing the non-ideality of the mixture. The hydrate-liquid-liquid equilibrium (HLLE) was measured in addition to the composition of the CO 2 -rich fluid phase in the presence of H 2 O. In contrast to the behavior in the presence of vapor, gas hydrates become more stable when increasing the CH 4 content, and the relative proportion of CH 4 to CO 2 decreases in the CO 2 -rich phase after gas hydrate formation.

Keywords: gas hydrate; CH 4; CO 2 -rich mixtures; phase equilibria; Soave–Redlich–Kwong (SRK) cubic equation of state (EoS) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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