LAPSE:2018.0507v1
Published Article
LAPSE:2018.0507v1
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
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.
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Keywords
Carbon Dioxide, CH4, gas exchange, gas hydrates, high-pressure experiments, N2, phase equilibrium
Subject
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:2018.0507v1
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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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
Version Comments
Original Submission
Other Meta
PII: en11081984, Publication Type: Journal Article
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Published Article
LAPSE:2018.0507v1
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doi:10.3390/en11081984
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[v1] (Original Submission)
Sep 21, 2018
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Sep 21, 2018
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https://psecommunity.org/LAPSE:2018.0507v1
Original Submitter
Calvin Tsay
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