Experimental Study of Mixed Gas Hydrates from Gas Feed Containing CH 4, CO 2 and N 2: Phase Equilibrium in the Presence of Excess Water and Gas Exchange

Ludovic Nicolas Legoix, Livio Ruffine, Christian Deusner 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, 29280 Plouzané, France
Christian Deusner: GEOMAR, Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, D-24148 Kiel, Germany
Matthias Haeckel: GEOMAR, Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, D-24148 Kiel, Germany

Energies, 2018, vol. 11, issue 8, 1-12

Abstract: 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 containing 10.2 g of H 2 O full conversion of the CH 4 hydrate grains to CO 2 hydrate is estimated to require 40 days. This delay is attributed to the shrinking core effect, where initially an outer layer of CO 2 -rich hydrate is formed that effectively slows down the further gas exchange between the vapor phase and the inner core of the CH 4 -rich hydrate grain.

Keywords: gas hydrates; CH 4; CO 2; N 2; high-pressure experiments; phase equilibrium; gas exchange (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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