Self-preservation phenomenon in gas hydrates and its application for energy storage

Majid, Ahmad A. A.; Koh, Carolyn A.

doi:10.1016/b978-0-12-817586-6.00008-6

Cited by 8 publications

(7 citation statements)

References 31 publications

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“…Within hydrate metastability region below ice melting point, if the free water was in the state of supercooled liquid phase, rapid hydrate dissociation occurred, while if the free water was in the state of ice, the self-preservation effect manifested and the hydrate dissociated at a slow rate because the ice crust coating on the surface of hydrate particle hindered the dissociation of hydrate and the release of guest gas to surroundings. Reprinted from [109] with permission.…”

Section: The Effect Of Dry Water On the Self-preservation Effectmentioning

confidence: 99%

Dry Water as a Promoter for Gas Hydrate Formation: A Review

Wei

Maeda

2023

Molecules

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Applications of clathrate hydrate require fast formation kinetics of it, which is the long-standing technological bottleneck due to mass transfer and heat transfer limitations. Although several methods, such as surfactants and mechanical stirring, have been employed to accelerate gas hydrate formation, the problems they bring are not negligible. Recently, a new water-in-air dispersion stabilized by hydrophobic nanosilica, dry water, has been used as an effective promoter for hydrate formation. In this review, we summarize the preparation procedure of dry water and factors affecting the physical properties of dry water dispersion. The effect of dry water dispersion on gas hydrate formation is discussed from the thermodynamic and kinetic points of view. Dry water dispersion shifts the gas hydrate phase boundary to milder conditions. Dry water increases the gas hydrate formation rate and improves gas storage capacity by enhancing water-guest gas contact. The performance comparison and synergy of dry water with other common hydrate promoters are also summarized. The self-preservation effect of dry water hydrate was investigated. Despite the prominent effect of dry water in promoting gas hydrate formation, its reusability problem still remains to be solved. We present and compare several methods to improve its reusability. Finally, we propose knowledge gaps in dry water hydrate research and future research directions.

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Section: The Effect Of Dry Water On the Self-preservation Effectmentioning

confidence: 99%

Dry Water as a Promoter for Gas Hydrate Formation: A Review

Wei

Maeda

2023

Molecules

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“…An example of gas hydrates for engineering and technological application is gas storage and transportation. − The dissociation of gas hydrates can be minimized at 263 K and ambient pressure via the self-preservation effect . The self-preservation effect is especially suited for gas storage and transportation, as reported by Gudmundsson in 1994. , Another example of gas hydrates for engineering and technological application is that gas hydrates can also be potentially applied in separation technologies, including gas separation, carbon capture and storage (CCS), and desalination. − Since gas hydrates can only trap small gas molecules, there is a preference for specific gas molecules to be captured within hydrate cages.…”

Section: Introductionmentioning

confidence: 99%

Applications of Solid-State Nuclear Magnetic Resonance (SS-NMR) for Characterization of Gas Hydrates: A Mini-review

Majid,

Koh

2024

Energy Fuels

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Over the years, there has been growing interest in gas hydrates for engineering and technological applications. This comprises using gas hydrates for energy storage, transportation, and gas separation, including carbon capture and storage (CCS). In all of these gas hydrate technological applications, information on the composition of the hydrate phase and the corresponding cage occupancies is crucial information, necessary to evaluate the performance of the separation. This information should be collected at various formation conditions (temperatures and pressures) and at different times (i.e., during formation, equilibrium, and during dissociation). Currently, there are few methods that can be used to determine and quantify the structure, composition, and guest occupancy of the hydrate phase. Solid-state nuclear magnetic resonance (SS-NMR) spectroscopy is a powerful molecular-level method that can be used to determine these characteristics of gas hydrates such as to study the cage occupancies of the hydrate phase, their structures, and their kinetics of hydrate formation and dissociation. These studies were performed on both pure and multicomponent hydrates, as well as in the presence of inhibitors and promoters (thermodynamic and kinetic). In this paper, we provide a review of the use of SS-NMR spectroscopy to investigate the properties of gas hydrates. The paper also discusses the advantages and applications of using solid-state NMR in gas hydrate studies.

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“…This method is defined as solidified natural gas (SNG) technology. It has several major advantages: ,− hydrate formation is an environmental process as it uses water, gas, and a small number of promoters. NG is stored in its respective molecular form, and recovery or utilization of the gases can be easily performed by thermal stimulation or depressurization.…”

Section: Introductionmentioning

confidence: 99%

Solidified Methane Storage Using an Efficient Class of Anionic Surfactants under Dynamic and Static Conditions: An Experimental and Computational Investigation

Farhadian

Mirzakimov

Semenov

et al. 2023

ACS Appl. Energy Mater.

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Rapid hydrate formation and high storage capacity are two key parameters in commercializing hydrate-based solidified natural gas technology. Surfactants are known as the most effective additives to accelerate the kinetics of gas hydrate formation under different conditions. This research introduces an efficient class of anionic surfactants – carboxyl-sulfonated surfactant (CSS) – as gas hydrate promoters for the first time. To that end, CSSs with different alkyl chain lengths were synthesized, and their promotion effect on methane hydrate formation was evaluated in static and dynamic conditions. Those CSSs with 10 carbon atoms provided a maximum conversion of 88.4% at 500 ppm, higher than that of sodium dodecyl sulfate (87.9%). However, those with 12 carbon atoms were selected as the optimal promoter in terms of kinetic constants. The results of a high-pressure autoclave experiments revealed that the hydrophilic–hydrophobic balance of CSSs strongly affected their promotional activity. CSSs with a short alkyl chain had lower promotion efficiency as they could not increase the solubility of gas in water, especially under static conditions. Additionally, molecular dynamic simulations showed that the length of the alkyl chain directly influences the performance of promoter molecules because a longer hydrophobic tail can attract more methane molecules from the solution to supply them for the growing hydrate surface. Moreover, the CSSs with 12 carbon atoms aggregated into a stable micelle during hydrate formation according to the hydrophobic interaction, which attracted methane molecules around its hydrophobic tail and enhanced the hydrate growth rate. These findings can be useful in developing novel surfactants for energy-efficient methane storage in gas hydrates.

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Self-preservation phenomenon in gas hydrates and its application for energy storage

Cited by 8 publications

References 31 publications

Dry Water as a Promoter for Gas Hydrate Formation: A Review

Dry Water as a Promoter for Gas Hydrate Formation: A Review

Applications of Solid-State Nuclear Magnetic Resonance (SS-NMR) for Characterization of Gas Hydrates: A Mini-review

Solidified Methane Storage Using an Efficient Class of Anionic Surfactants under Dynamic and Static Conditions: An Experimental and Computational Investigation

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