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Phase Equilibria of the CH4-CO2 Binary and the CH4-CO2-H2O Ternary Mixtures in the Presence of a CO2-Rich Liquid Phase ArchiMer
Legoix, Ludovic; Ruffine, Livio; Donval, Jean-pierre; Haeckel, Matthias.
The knowledge of the phase behavior of carbon dioxide (CO2)-rich mixtures is a key factor to understand the chemistry and migration of natural volcanic CO2 seeps in the marine environment, as well as to develop engineering processes for CO2 sequestration coupled to methane (CH4) production from gas hydrate deposits. In both cases, it is important to gain insights into the interactions of the CO2-rich phase—liquid or gas—with the aqueous medium (H2O) in the pore space below the seafloor or in the ocean. Thus, the CH4-CO2 binary and CH4-CO2-H2O ternary mixtures were investigated at relevant pressure and temperature conditions. The solubility of CH4 in liquid CO2 (vapor-liquid equilibrium) was determined in laboratory experiments and then modelled with the...
Tipo: Text Palavras-chave: Gas hydrate; CH4; CO2-rich mixtures; Phase equilibria; Soave-Redlich-Kwong (SRK) cubic equation of state (EoS).
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00414/52538/53349.pdf
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Experimental Study of Mixed Gas Hydrates from Gas Feed Containing CH4, CO2 and N2: Phase Equilibrium in the Presence of Excess Water and Gas Exchange ArchiMer
Legoix, Ludovic; Ruffine, Livio; Deusner, Christian; Haeckel, Matthias.
This article presents gas hydrate experimental measurements for mixtures containing methane (CH 4 ), carbon dioxide (CO 2 ) and nitrogen (N 2 ) with the aim to better understand the impact of water (H 2 O) on the phase equilibrium. Some of these phase equilibrium experiments were carried out with a very high water-to-gas ratio that shifts the gas hydrate dissociation points to higher pressures. This is due to the significantly different solubilities of the different guest molecules in liquid H 2 O. A second experiment focused on CH 4 -CO 2 exchange between the hydrate and the vapor phases at moderate pressures. The results show a high retention of CO 2 in the gas hydrate phase with small pressure variations within the first hours. However, for our system...
Tipo: Text Palavras-chave: Gas hydrates; CH4; CO2; N-2; High-pressure experiments; Phase equilibrium; Gas exchange.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00452/56345/57935.pdf
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Stability of mixed gas hydrates and mass transfer during formation, accumulation and destabilization: laboratory experiment and modeling ArchiMer
Legoix, Ludovic.
Gas hydrates are fascinating ice-like compounds made of water cages that retain various types of guest molecules. Natural gas hydrates on Earth form below the seafloor and permafrost and contain mainly methane (CH4). Methane from hydrate deposits could be considered as an energy resource. One possible production scenario of CH4 from hydrates is the injection of carbon dioxide (CO2) or carbon dioxide-nitrogen(CO2-N2) mixed gas into the reservoir. Depending on the thermodynamic constraints, the composition of the gas hydrate guest molecules changes: the energy source CH4 is released and the greenhouse gas CO2 is trapped. The aim of the present work is to study the mixed gas hydrates that form in gas hydrate reservoirs after injection of CO2 or CO2-N2 gas...
Tipo: Text Palavras-chave: Gas hydrates; Methane; Carbon dioxide; Thermodynamic.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00490/60183/63524.pdf
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