Insights into the porous structure of surfactant-promoted gas hydrate

Venet, Saphir; Guerton, Fabrice; Desmedt, Aline

doi:10.1016/j.ces.2021.117193

Cited by 15 publications

(20 citation statements)

References 23 publications

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“…These crystals formed a porous matrix with the capillaries intaking water. The porous structure of the hydrate “rim” is also confirmed in ref . It is probable that the appearance of these crystals is somehow related with the hydrate film on the wall.…”

Section: Resultssupporting

confidence: 58%

Nucleation and Growth of Methane and Carbon Dioxide Hydrates on Wetting Liquid Films

Strukov

Adamova

Manakov

2022

Crystal Growth & Design

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The results of visual studies of the growth of methane and carbon dioxide hydrates from highly dilute aqueous solutions of acids and alkalis, as well as from the same solutions with the addition of 0.1 wt % sodium dodecyl sulfate, are presented. It was found that in addition to the growth of hydrate films at the water−gas interface (for solutions without sodium dodecyl sulfate) and the growth of a loose mass of hydrate on the walls of the reactor in the case of solutions with sodium dodecyl sulfate, there is also growth of the hydrate film on the free walls of the reactor. We speculate what these hydrate films form from the wetting water films located on the walls. In addition, growth of relatively large hydrate agglomerates on the reactor walls was observed. They look like "growing directly from the wall". Presumably, this is due to the possibility of film transfer of water between the formed hydrate films and the walls of the reactor. Possible features of the hydrate formation process caused by the formation of hydrates on wetting films are also discussed.

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Section: Resultssupporting

confidence: 58%

Nucleation and Growth of Methane and Carbon Dioxide Hydrates on Wetting Liquid Films

Strukov

Adamova

Manakov

2022

Crystal Growth & Design

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“…The similar phenomenon of discrepancy between the consumption rates of gas and liquid was observed by Botimer and Venet in SDS solutions, where the consumptions of SDS solution and gas were also not synchronized. , Given leucine’s similar impact on methane hydrate growth to SDS’s promotional effect, it is believed leucine can reduce liquid surface tension like SDS. Thus, contact angles at various leucine concentrations were measured, with results shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Kinetic Promotional Effect of Methane Hydrate Formation in the Presence of Leucine

Yu,

Chen,

Wang

2024

Energy Fuels

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Recent advancements in energy storage and transportation have identified natural gas hydrates as a viable medium for gas storage and transportation, due to their superior storage capacity and favorable conditions. However, the slow reaction rate of hydrate formation limits its industrial application, necessitating rate enhancement for practical use. In this study, leucine is selected as the promoter for the formation of methane hydrates. The research initially focuses on assessing the promotional effect of varying concentrations of leucine. The findings indicate that higher concentrations of leucine substantially increase the reaction rate and shorten the time required for the process, while maintaining the gas storage capacity. Further investigation using a visual apparatus reveals that elevated reaction rates coincide with higher initial rates of water conversion and an observed discrepancy between gas and liquid consumption. The study concludes by employing bilateral single droplet visualization technology and contact angle characterization to ascertain the critical influence of surface wettability on the rapid formation of hydrates. This holds theoretical significance for applications based on methane hydrates, including the storage and transportation of natural gas.

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“…A similar analysis has been applied to the methane hydrate matrix for the water/methane system, in the presence of sodium dodecyl sulfate (SDS) surfactant. 20 In this case, the hydrates grew by SDS water solution imbibition of already formed crystals. This water layer is instantaneously (seconds or less) transformed into hydrate, and the process continues until no more water is available for crystallization.…”

Section: Discussionmentioning

confidence: 95%

“…The SDS surfactant�considered as a hydrate promoter� impacts the hydrate formation and its porosity. 20 Raman spectroscopy is an experimental approach, particularly appropriate for investigating gas hydrate formation. In the present study, the impact of commercial AAs additives on hydrate crystal morphology and aggregate size has been investigated by using Raman spectroscopy and optical imaging.…”

Section: Introductionmentioning

confidence: 99%

Morphology and Distribution Structure Characterization of Methane Hydrate Formed in the Presence of Amphiphilic Antiagglomerant Additive

Abdallah,

Chevalier,

Pelerin

et al. 2024

Energy Fuels

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We investigate the impact of commercial amphiphilic antiagglomerant additive (AA) on the hydrate crystal morphology, size, and dispersion in organic phases, by using optical imaging and Raman spectroscopy. To better reproduce the conditions during oil and gas offshore production, methane hydrates were formed from saline water (5 g/L NaCl) in the presence of AA additive at various concentrations (aqueous solutions of 5 and 7 wt %), by using the Ketrul211 condensate phase (corresponding to a petroleum cut of C 12 −C 14 carbon distribution), under a constant subcooling at 8.5 ± 0.5 K and 70 bar. Two systems have been studied: water-AA/methane and water-AA/ketrul211/methane. By optical imaging observation, the presence of AA additives leads to polygonal periodic crystals (with size ranging from ca. 1 to 10 μm) for the water-AA/methane system and perpendicular needle crystals (with size close to 10 μm) for the water-AA/ketrul211/methane system. In the absence of the AA additive, no polygonal or needle crystal morphology has been observed. With the help of Raman imaging, the methane hydrate distribution has been investigated at a micrometer scale: the formation of methane hydrate aggregates is revealed inside the ketrul211 bulk-phase matrix.

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Insights into the porous structure of surfactant-promoted gas hydrate

Cited by 15 publications

References 23 publications

Nucleation and Growth of Methane and Carbon Dioxide Hydrates on Wetting Liquid Films

Nucleation and Growth of Methane and Carbon Dioxide Hydrates on Wetting Liquid Films

Kinetic Promotional Effect of Methane Hydrate Formation in the Presence of Leucine

Morphology and Distribution Structure Characterization of Methane Hydrate Formed in the Presence of Amphiphilic Antiagglomerant Additive

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