Hydrate formation in layers of gas-saturated amorphous ice

Faĭzullin, M. Z.; Vinogradov, A. P.; Koverda, V. P.

doi:10.1016/j.ces.2015.03.032

Cited by 29 publications

(8 citation statements)

References 34 publications

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“…Hydrate of methane, ethane, propane, and carbon dioxide was generated in layers of gas-saturated amorphous ice using low-temperature molecular beams. Gas hydrate was observed to dissociate at an abnormally low rate; retention of hydrate during the dissociation process below 273 K was observed [79]. It was also predicted that the co-existence of s I and s II structure hydrate could occur by controlling the composition of methane-ethane mixture close to the s I/s II transition point; this is also considered as a metastable state of hydrate.…”

Section: More Mechanisms Of Hydrate Metastabilitymentioning

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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Section: More Mechanisms Of Hydrate Metastabilitymentioning

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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“…However, the phase state (ice and/or inclusion compounds) and the nature and dynamics of phase transitions in systems containing hydrate forming agents have only been studied using this method in a few works [ 12 , 13 , 14 ]. In addition, a dielectric measuring cell has been used to artificially produce gas hydrates [ 15 ]. In the present work, we propose the design of a new dielectric cell allowing one to study the formation/decomposition of gas hydrates under pressure.…”

Section: Introductionmentioning

confidence: 99%

Advances in the Study of Gas Hydrates by Dielectric Spectroscopy

et al. 2021

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The influence of kinetic hydrate inhibitors on the process of natural gas hydrate nucleation was studied using the method of dielectric spectroscopy. The processes of gas hydrate formation and decomposition were monitored using the temperature dependence of the real component of the dielectric constant ε′(T). Analysis of the relaxation times τ and activation energy ΔE of the dielectric relaxation process revealed the inhibitor was involved in hydrogen bonding and the disruption of the local structures of water molecules.

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“…Without a pipeline a promising way of gas transportation is its conversion into the gas hydrate (solid) state and its transportation at the atmospheric pressure and low temperature (-10 ... -20°C) [1]. In [2][3][4] and some other paper, the properties of gas hydrates, basic conditions and features of their formation are described; the types of their crystallization, mechanisms of gas hydrate formation and decomposition are presented [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the process of hydrate-formation by the method of explosive boiling of liquefied freon 134a in the water volume during decompression

Meleshkin

Elistratov

2018

MATEC Web Conf.

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The experiments on obtaining gas hydrate of refrigerant 134a were carried out by the method, based on explosive boiling-up of a layer of liquefied gas in a bulk of water at decompression. It is shown that this method combines several factors, leading to intensification of hydrate formation process, resulting in the fast gas hydrate growth. The effect of the decompression rate on the volume of produced hydrate was studied experimentally.

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Hydrate formation in layers of gas-saturated amorphous ice

Cited by 29 publications

References 34 publications

Metastable state of gas hydrate during decomposition: A novel phenomenon

Metastable state of gas hydrate during decomposition: A novel phenomenon

Advances in the Study of Gas Hydrates by Dielectric Spectroscopy

Experimental investigation of the process of hydrate-formation by the method of explosive boiling of liquefied freon 134a in the water volume during decompression

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