Self-preservation and Stability of Methane Hydrates in the Presence of NaCl

Prasad, Pinnelli S. R.; Kiran, Burla Sai

doi:10.1038/s41598-019-42336-1

Cited by 34 publications

(12 citation statements)

References 34 publications

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“…In this case the source of the water for the ice layer originates from the particle. Formation of self preserved hydrates in salt water was reported by [32]. They confirmed self-preservation up to the melting point of ice in the three component system water-gas-NaCl for salt concentrations below a threshold of 0.5-1.5% NaCl.…”

Section: Computational Detailssupporting

confidence: 57%

Self-preserving ice layers on CO₂ clathrate particles: Implications for Enceladus, Pluto, and similar ocean worlds

Boström

Esteso

Fiedler

et al. 2021

A&A

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Context. Gas hydrates can be stabilised outside their window of thermodynamic stability by the formation of an ice layer – a phenomenon termed self-preservation. This can lead to a positive buoyancy for clathrate particles containing CO2 that would otherwise sink in the oceans of Enceladus, Pluto, and similar oceanic worlds. Aims. Here we investigate the implications of Lifshitz forces and low occupancy surface regions on type I clathrate structures for their self-preservation through ice layer formation, presenting a plausible model based on multi-layer interactions through dispersion forces. Methods. We used optical data and theoretical models for the dielectric response for water, ice, and gas hydrates with a different occupancy. Taking this together with the thermodynamic Lifshitz free energy, we modelled the energy minima essential for the formation of ice layers at the interface between gas hydrate and liquid water. Results. We predict the growth of an ice layer between 0.01 and 0.2 μm thick on CO, CH4, and CO2 hydrate surfaces, depending on the presence of surface regions depleted in gas molecules. Effective hydrate particle density is estimated, delimiting a range of particle size and compositions that would be buoyant in different oceans. Over geological time, the deposition of floating hydrate particles could result in the accumulation of kilometre-thick gas hydrate layers above liquid water reservoirs and below the water ice crusts of their respective ocean worlds. On Enceladus, the destabilisation of near-surface hydrate deposits could lead to increased gas pressures that both drive plumes and entrain stabilised hydrate particles. Furthermore, on ocean worlds, such as Enceladus and particularly Pluto, the accumulation of thick CO2 or mixed gas hydrate deposits could insulate its ocean against freezing. In preventing freezing of liquid water reservoirs in ocean worlds, the presence of CO2-containing hydrate layers could enhance the habitability of ocean worlds in our Solar System and on the exoplanets and exomoons beyond.

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Section: Computational Detailssupporting

confidence: 57%

Self-preserving ice layers on CO₂ clathrate particles: Implications for Enceladus, Pluto, and similar ocean worlds

Boström

Esteso

Fiedler

et al. 2021

A&A

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“…This was because the impurity of water and the small hydrate particle would increase the hydrate dissociation (Takeya et al, 2005), and in this study, the addition of ZIF-8 increased the impurity of water and porosity of hydrate. The phenomenon that the shift of the self-preservation temperature window has been reported by Prasad and Kiran (2019). The gas release was the fastest at 268.15 K and the slowest release occurred at 263.15 K. At 268.15 K, 57.98% of the gas released at 5 h, this was very close with that in the carbon fixed bed at 268.15 K in our previous work (Xiao et al, 2019).…”

Section: Gas Release Ratesupporting

confidence: 83%

Adsorption-Hydration Sequence Method for Methane Storage in Porous Material Slurry

et al. 2020

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Porous materials are deemed to be capable for promoting hydrate formation, while for the purpose of hydrate-based gas storage, those systems containing porous materials often cannot meet the requirement of high storage density. To increase the storage density, an adsorption-hydration sequence method was designed and systematically examined in this study. Methane storage and release in ZIF-8 slurries and fixed beds were investigated. The ZIF-8 retained 98.62%, while the activated carbon lost 62.17% of their adsorption capacities in slurry. In ZIF-8 fixed beds, methane storage density of 127.41 V/V bed was acquired, while the gas loss during depressurization accounted for 21.50% of the gas uptake. In the ZIF-8 slurry, the storage density was effectively increased with the adsorption-hydration sequence method, and the gas loss during depressurization was much smaller than that in fixed beds. In the slurry, the gas uptake and gas loss decreased with the decrease of the chilling temperature. The largest gas uptake and storage density of 78.84 mmol and 133.59 V/V bed were acquired in the slurry with ZIF-8 content of 40 wt.% at 268.15 K, meanwhile, the gas loss just accounted for 14.04% of the gas uptake. Self-preservation effect was observed in the slurry, and the temperature for the slowest gas release was found to be 263.15 K, while the release ratio at 10 h reached to 43.42%. By increasing the back pressure, the gas release rate could be effectively controlled. The gas release ratio at 1.1 MPa at 10 h was just 11.08%. The results showed that the application of adsorption-hydration sequence method in ZIF-8 slurry is a prospective manner for gas transportation.

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“…As a result, the rate of NGH dissociation and gas production is significantly suppressed, and it may even be zero when the ice phase, as an efficient diffusion barrier (shown in Figure ), impedes the advance of the dissociation front. This phenomenon of kinetic anomaly is regularly called the effect of anomalous self-preservation of NGH by many credible reports, , and that one metastability state of hydrates reached is regarded . In other words, three NGH dissociation regimes (namely, dissociated into gas and water, a transition regime of gas and a heterogeneous water–ice mixture, dissociated into gas and ice) could be exhibited .…”

Section: Methods Of Gas Recovery From Hbsmentioning

confidence: 99%

Recent Advances in Methods of Gas Recovery from Hydrate-Bearing Sediments: A Review

et al. 2022

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Safe, efficient, and economical gas recovery from hydrate-bearing sediments (HBS) is a severe issue that determines if natural gas hydrate (NGH), as an alternative energy in the future as fossil fuels approach depletion, is applied. Researchers worldwide are committed to developing a safe, efficient, and economical method of gas recovery from HBS. However, until now, most methods are still being validated and not have not been identified to exploit NGH commercially. Therefore, it is appropriate and significant to discuss researchers’ achievements to exploit NGH and summarize their potential benefits and challenges. This paper introduces nearly all the conventional and latest NGH exploitation methods and reviews field trials’ development characteristics. On the basis of laboratory experiments and field trials, key challenges restricting safe and efficient NGH development, and the existing research gaps reflecting these challenges, are also presented from the gas production, security, and economic aspects. The unfavorable situation mainly comprises the insufficient sensible heat, extremely low thermal conductivity, and ultralow permeability of HBS, lower gas production rate and its intense fluctuations, higher water-to-gas ratio (WGR), geological deformation, and subsidence of HBS attributed to excessive sand production, driving the consideration of some possible solutions. Given this, a new method for enhanced gas production from HBS based on the combination of depressurization (DP) and an in-situ heat generation method is proposed. Benefiting from multiple theoretical enhancement mechanisms such as replenishing energy to HBS with in-situ heat generation powders, cementing and strengthening the HBS skeleton, improving the gas permeability in HBS, decreasing the WGR based on blocking water, and removing gas characteristics of hydration products, this method could be expected to achieve promising long-term performance of gas production, which will be theoretically and practically significant to study commercial gas production.

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Self-preservation and Stability of Methane Hydrates in the Presence of NaCl

Cited by 34 publications

References 34 publications

Self-preserving ice layers on CO₂ clathrate particles: Implications for Enceladus, Pluto, and similar ocean worlds

Self-preserving ice layers on CO₂ clathrate particles: Implications for Enceladus, Pluto, and similar ocean worlds

Adsorption-Hydration Sequence Method for Methane Storage in Porous Material Slurry

Recent Advances in Methods of Gas Recovery from Hydrate-Bearing Sediments: A Review

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Self-preservation and Stability of Methane Hydrates in the Presence of NaCl

Cited by 34 publications

References 34 publications

Self-preserving ice layers on CO2 clathrate particles: Implications for Enceladus, Pluto, and similar ocean worlds

Self-preserving ice layers on CO2 clathrate particles: Implications for Enceladus, Pluto, and similar ocean worlds

Adsorption-Hydration Sequence Method for Methane Storage in Porous Material Slurry

Recent Advances in Methods of Gas Recovery from Hydrate-Bearing Sediments: A Review

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Self-preserving ice layers on CO₂ clathrate particles: Implications for Enceladus, Pluto, and similar ocean worlds

Self-preserving ice layers on CO₂ clathrate particles: Implications for Enceladus, Pluto, and similar ocean worlds