NMR evidence of supercooled water formation during gas hydrate dissociation below the melting point of ice

Melnikov, V. P.; Nesterov, A. N.; Поденко, Л. С.; Reshetnikov, A. M.; Shalamov, V. V.

doi:10.1016/j.ces.2011.11.039

Cited by 42 publications

(28 citation statements)

References 26 publications

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“…Subsequently, the possibility of hydrate dissociation into supercooled water and gas was confirmed for the hydrates of methane, ethane, carbon dioxide, and Freon-12 (CCl 2 F 2 ) using optical microscopy observations (Melnikov et al, 2009(Melnikov et al, , 2010(Melnikov et al, , 2011, Raman (Ohno et al, 2011) and pulsed NMR (Melnikov et al, 2012 spectroscopy, and differential thermal analysis (DTA) Melnikov et al, 2015). Hence, we can conclude that the possibility gas hydrates dissociating below the ice melting point into supercooled water and gas is a universal property common to gas hydrates.…”

Section: Introductionmentioning

confidence: 94%

Study of gas hydrate metastability and its decay for hydrate samples containing unreacted supercooled liquid water below the ice melting point using pulse NMR

Мадыгулов

Nesterov

Reshetnikov

et al. 2015

Chemical Engineering Science

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Section: Introductionmentioning

confidence: 94%

Study of gas hydrate metastability and its decay for hydrate samples containing unreacted supercooled liquid water below the ice melting point using pulse NMR

Мадыгулов

Nesterov

Reshetnikov

et al. 2015

Chemical Engineering Science

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“…Since the relative change in temperature for the processes under consideration is small, the reduced diffusion coefficient D will be considered constant. It should be mentioned that many factors can influence the intensity of the hydrate decomposition and formation, such as the introduction of various surfactants, the exposure of the shock and electromagnetic waves [46][47][48][49][50][51][52][53], etc. The empirical parameter D depends both on the hydrate structure and on the porous medium skeleton features.…”

Section: Description Of the Ch 4 -Co 2 Replacement Kinetics In The Hymentioning

confidence: 99%

Mathematical Model of Carbon Dioxide Injection into a Porous Reservoir Saturated with Methane and Its Gas Hydrate

2020

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In this paper, the process of methane replacement in gas hydrate with carbon dioxide during CO2 injection into a porous medium is studied. A model that takes into account both the heat and mass transfer in a porous medium and the diffusion kinetics of the replacement process is constructed. The influences of the diffusion coefficient, the permeability and extent of a reservoir on the time of full gas replacement in the hydrate are analyzed. It was established that at high values of the diffusion coefficient in hydrate, low values of the reservoir permeability, and with the growth of the reservoir length, the process of the CH4-CO2 replacement in CH4 hydrate will take place in the frontal regime and be limited, generally, by the filtration mass transfer. Otherwise, the replacement will limited by the diffusion of gas in the hydrate.

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“…This stage started from 2011 when a systematic and detailed classification of hydrate metastability was introduced by Istomin [50]. The formation of supercooled liquid water during dissociation of hydrate was for the first time detected [51][52][53]. A metastable superheated solid phase of methane hydrate was presented when studying the effect of bubbles on the kinetics of hydrate decomposition [54].…”

Section: Introductionmentioning

confidence: 99%

Metastable state of gas hydrate during decomposition: A novel phenomenon

Sun

Fan

Yang

et al. 2020

Chinese Journal of Chemical Engineering

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Natural gas hydrates are solid compounds with cage-like structures formed by gas and water. An intriguing phenomenon that gas hydrates can dissociate at a low rate below the ice freezing point has been viewed as the metastability of hydrate. The mechanisms of hydrate metastability have been widely studied, and many mechanisms were proposed involving the self-preservation effect, supercooled water-gas-hydrate metastable equilibrium, and supersaturated liquid-gas-hydrate system etc. The metastable state of hydrate could be of crucial significance in the kinetics of hydrate formation and decomposition, heat and mass transfer during gas production processes, and the application of hydrate-based technique involving desalination, energy storage and transportation, and gas separation and sequestration. Few researches have systematically considered this phenomenon, and its mechanism remains unclear. In this work, various mechanisms and hypothesis explaining the metastable state of gas hydrates were introduced and discussed. Further studies are still required to reveal the intrinsic nature of this metastable state of gas hydrate, and this work could give some implications on the existing theory and current status of relevant efforts.

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NMR evidence of supercooled water formation during gas hydrate dissociation below the melting point of ice

Cited by 42 publications

References 26 publications

Study of gas hydrate metastability and its decay for hydrate samples containing unreacted supercooled liquid water below the ice melting point using pulse NMR

Study of gas hydrate metastability and its decay for hydrate samples containing unreacted supercooled liquid water below the ice melting point using pulse NMR

Mathematical Model of Carbon Dioxide Injection into a Porous Reservoir Saturated with Methane and Its Gas Hydrate

Metastable state of gas hydrate during decomposition: A novel phenomenon

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