Experimental study of methane hydrate formation in aqueous foam stabilized by surfactants

Adamova, T. P.; Manakov, Andrey Yu.; Elistratov, D. S.; Pil’nik, A.A.; Chernov, A. A.

doi:10.1016/j.ijheatmasstransfer.2021.121775

Cited by 12 publications

(4 citation statements)

References 47 publications

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“…The same may also be expected for hydrate formation in wetting films . In addition, the possibility of the formation and growth of hydrates in foam films, whose properties are similar to wetting films, was recently demonstrated in ref . It follows from our experimental observations that the liquid wetting films are an equitable site for hydrate nucleation and growth, along with the liquid–gas surface and the contact line liquid–wall–gas.…”

Section: Resultssupporting

confidence: 75%

“…The presence of such films of several micrometers thick was noted in tomographic studies of hydrate-containing sands and model rocks. , Binding of the water film, which was located between the reactor wall and the hydrate crust, with bulk water in the reactor is possible (Figure ). In this case, the film transport of water is possible, similar to what was observed for foam films, as shown in ref . In addition, the possibility of capillary suction of water directly over the hydrate layer also cannot be ruled out.…”

Section: Resultssupporting

confidence: 60%

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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: 75%

Section: Resultssupporting

confidence: 60%

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

Strukov

Adamova

Manakov

2022

Crystal Growth & Design

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“…As the foam carpet covers contaminated soil, liquid draining occurs simultaneously, making the liquid film thinner and thinner, which undermines the VOC suppression performance [ 19 , 20 , 21 , 22 ]. Modified components should be appended to the substrate to improve the stability of foams, which further prolongs the effective suppressing time [ 23 , 24 , 25 ]. In addition to some common additions to the foam formula, such as lamellae stabilizers, viscosities, or bi-surfactants [ 20 ], nanoparticles are likewise regarded as effective ingredients, which can curb the possibility of the foam collapsing by forming a coalescence barrier [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

Yu,

Xuan

2024

Toxics

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Volatile organic compounds (VOCs) are prevalent soil contaminants. During the ex situ soil remediation process, VOCs may overflow from the soil and cause gas to diffuse into the atmosphere. Moreover, some VOCs, such as trichloromethane, are categorized by the EPA as emerging contaminants, imparting toxicity to organs, and the endocrine and immune systems, and posing a huge threat to human health and the environment. To reduce VOCs’ emissions from contaminated soil, aqueous foam suppression is a prospective method that provides a durable mass transfer barrier for VOCs, and it has been widely used in odor control. Based on an aqueous foam substrate, in order to enhance the foam’s stability and efficiency of suppression, SiO2–TiO2-modified nanoparticles have been used as stabilizing agents to improve the mechanical strength of liquid film. The nanoparticles are endowed with the ability to photocatalyze after the introduction of titanium dioxide. From SEM imaging, IR, and a series of morphological characterization experiments, the dispersibility of the SiO2–TiO2-modified nanoparticles was significantly improved under the polar solvent, which, in turn, increased the foam duration. The foam dynamic analysis experiments showed that the foam liquid half-life was increased by 4.08 h, and the volume half-life was increased by 4.44 h after adding the novel synthesized nanoparticles to the bulk foam substrate. From the foam VOC suppression test, foam with modified nanoparticles was more efficient in terms of VOCs’ suppression, in contrast with its nanoparticle-free counterparts, due to the longer retention time. Moreover, in a bench-scale experiment, the SiO2–TiO2 nanoparticles foam worked against dichloroethane, n–hexane, and toluene for almost 12 h, with a 90% suppression rate, under UV irradiation, which was 2~6 h longer than that of UV-free SiO2–TiO2 nanoparticles, the KH–570-modified nanosilica foam, and the nanoparticle-free bulk foam. XPS and XRD results indicate that in SiO2–TiO2 nanoparticles, the proportion of titanium valence was changed, providing more oxygen vacancies compared to raw titanium dioxides.

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“…The experimental results showed that foam containing SDS significantly accelerated the nucleation process of methane hydrate. Adamova et al 27 introduced the formation of methane hydrate in water-based foam with SDS as a stabilizer, which proved that water-based foam was a good hydrate formation system. Water-based foam containing SDS can promote the formation of methane hydrate, but it rarely involves the promotion effect of water-based high expansion foam containing SDS for fire protection on the formation of methane hydrate, which also provides us with research space.…”

Section: Introductionmentioning

confidence: 99%

Study on Hydrate Formation and Foam Stability in a Liquefied Natural Gas–High Expansion Foam System

Zhu,

Peng,

Xie

et al. 2023

Energy Fuels

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In the process of high expansion foam inhibiting liquefied natural gas (LNG) leakage evaporation, LNG and water in foam will generate hydrates in a normal pressure environment. In order to study the absorption effect of hydrate on LNG vapor, a hydrate formation device in an LNG−foam system was designed. The gas content experiment of hydrate was carried out to evaluate the inhibition effect of hydrate absorption on LNG evaporation, which provides a basis for improving the stability time of hydrate and reducing the escape rate of natural gas. Tetrahydrofuran (THF) will aggravate the foam drainage rupture, thereby weakening the stability of the foam. On the basis of adding a hydrate thermodynamic promoter, nanoparticles were added to enhance the stability of foam. The experimental results show that the foam half-life of 1 wt % THF and 0.5 wt % hydrophilic SiO 2 nanoparticles is the longest, which is 1.7 times higher than that without additives. The gas absorption of hydrate formed in the compound system accounts for 57.5% of LNG evaporation gas, which is more than 4 times that without additives.

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Experimental study of methane hydrate formation in aqueous foam stabilized by surfactants

Cited by 12 publications

References 47 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

SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

Study on Hydrate Formation and Foam Stability in a Liquefied Natural Gas–High Expansion Foam System

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