2013
DOI: 10.1134/s0036024413110228
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Pulsed NMR investigation of the supercooled water-gas hydrate-gas metastable equilibrium

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Cited by 12 publications
(5 citation statements)
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“…Thus, the NMR results show that supercooled unfrozen pore water in frozen hydratebearing sediments can hold for several days during the dissociation of pore gas hydrates upon the pressure decreasing below the equilibrium. Similar inferences regarding the possible lifespan of residual liquid water during the dissociation of gas hydrates at temperatures below 0 • C were suggested previously [75][76][77], but only for bulk conditions and for the period of a few hours after the pressure drop. Our experimental results extend the existing ideas on the mechanisms of pore gas hydrate self-preservation in permafrost [8].…”
Section: Gas Pressuresupporting
confidence: 84%
“…Thus, the NMR results show that supercooled unfrozen pore water in frozen hydratebearing sediments can hold for several days during the dissociation of pore gas hydrates upon the pressure decreasing below the equilibrium. Similar inferences regarding the possible lifespan of residual liquid water during the dissociation of gas hydrates at temperatures below 0 • C were suggested previously [75][76][77], but only for bulk conditions and for the period of a few hours after the pressure drop. Our experimental results extend the existing ideas on the mechanisms of pore gas hydrate self-preservation in permafrost [8].…”
Section: Gas Pressuresupporting
confidence: 84%
“…1, the L sw -H-G metastable equilibrium line is in actuality an extension of the liquid water-hydrate-gas (L w -H-G) equilibrium line into the temperature region below 273 K in the p-T phase diagram (Mel'nikov et al, 2007;Melnikov et al, 2009Melnikov et al, , 2010Melnikov et al, , 2011Ohno et al, 2011;Vlasov et al, 2013). The region in the p-T phase diagram between the I-H-G equilibrium line and the L sw -H-G metastable equilibrium line is the hydrate metastability region.…”
Section: Introductionmentioning
confidence: 97%
“…Mass of supercooled water m sw in the sample during the growth/dissociation of metastable Freon-12 hydrate at 270 K and different pressures in the reactor as a function of time t. The pressure of the L sw -H-G metastable equilibrium p meq is taken from the paper byVlasov et al (2013). Change of the dissociation rate of metastable Freon-12 hydrate with the driving force of the hydrate dissociation at 270 K. Mass of supercooled water in the sample and pressure in the reactor during the Freon-12 hydrate growth/dissociation and ice crystallization at 272 K as functions of time.…”
mentioning
confidence: 99%
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“…Ice is the stable water phase which is formed during the hydrate dissociation at temperatures below 273 K. However, it was shown recently [14−16] that gas hydrates dissociation at temperatures below 273 K can precede through the intermediate stage of the supercooled water formation. Supercooled water [17] or residual ice [18] can also be presented in the gas hydrate samples as unreacted water phase which is not converted into hydrates during their formation. It is supposed that unreacted water in gas hydrate samples or water formed during the hydrate dissociation and the phase state of this water (ice or supercooled liquid) will influence the dissociation behavior of gas hydrates below the ice melting point [18,19].…”
Section: Introductionmentioning
confidence: 99%