LAPSE:2018.0507
Published Article
LAPSE:2018.0507
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
Ludovic Nicolas Legoix, Livio Ruffine, Christian Deusner, Matthias Haeckel
September 21, 2018
This article presents gas hydrate experimental measurements for mixtures containing methane (CH₄), carbon dioxide (CO₂) and nitrogen (N₂) with the aim to better understand the impact of water (H₂O) 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 H₂O. A second experiment focused on CH₄-CO₂ exchange between the hydrate and the vapor phases at moderate pressures. The results show a high retention of CO₂ in the gas hydrate phase with small pressure variations within the first hours. However, for our system containing 10.2 g of H₂O full conversion of the CH₄ hydrate grains to CO₂ hydrate is estimated to require 40 days. This delay is attributed to the shrinking core effect, where initially an outer layer of CO₂-rich hydrate is formed that effectively slows down the further gas exchange between the vapor phase and the inner core of the CH₄-rich hydrate grain.
Keywords
Carbon Dioxide, CH4, gas exchange, gas hydrates, high-pressure experiments, N2, phase equilibrium
Suggested Citation
Legoix LN, Ruffine L, Deusner C, Haeckel M. 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. (2018). LAPSE:2018.0507
Author Affiliations
Legoix LN: GEOMAR, Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, D-24148 Kiel, Germany; Institut Français de Recherche pour l’Exploitation de la Mer (IFREMER), Centre de Bretagne, Département Ressources Physiques et Ecosystèmes de Fond de Mer, Uni [ORCID]
Ruffine L: 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, 29280 Plouzané, France
Deusner C: GEOMAR, Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, D-24148 Kiel, Germany
Haeckel M: GEOMAR, Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, D-24148 Kiel, Germany [ORCID]
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Journal Name
Energies
Volume
11
Issue
8
Article Number
E1984
Year
2018
Publication Date
2018-07-31
Published Version
ISSN
1996-1073
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Original Submission
Other Meta
PII: en11081984, Publication Type: Journal Article
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LAPSE:2018.0507
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doi:10.3390/en11081984
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Sep 21, 2018
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Sep 21, 2018
 
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Calvin Tsay
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