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
Type | Article | ||||||||
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Date | 2018-08 | ||||||||
Language | English | ||||||||
Author(s) | Legoix Ludovic1, 2, Ruffine Livio2, Deusner Christian1, Haeckel Matthias1 | ||||||||
Affiliation(s) | 1 : Helmholtz Ctr Ocean Res Kiel, GEOMAR, Wischhofstr 1-3, D-24148 Kiel, Germany. 2 : Inst Francais Rech Exploitat Mer IFREMER, Ctr Bretagne, Unit Geosci Marines, Dept Ressources Phys & Ecosyst Fond Mer, F-29280 Plouzane, France. |
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Source | Energies (1996-1073) (Mdpi), 2018-08 , Vol. 11 , N. 8 , P. 1984 (12p.) | ||||||||
DOI | 10.3390/en11081984 | ||||||||
WOS© Times Cited | 7 | ||||||||
Keyword(s) | gas hydrates, CH4, CO2, N-2, high-pressure experiments, phase equilibrium, gas exchange | ||||||||
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. |
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