Anti-gas hydrate surfaces: perspectives, progress and prospects

Wang, Feng; Ma, Rui; Xiao, Senbo; English, Niall J.; He, Jianying; Zhang, Zhiliang

doi:10.1039/d1ta08965j

Cited by 16 publications

(13 citation statements)

References 214 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies ,,− have reported that the interfacial structures of CH 4 hydrate solids play a critical role in the surface adsorption of LDHIs and AAs and hydrate aggregation and deposition to the walls of oil and gas transmission pipelines. It is noted that the complex liquid-phase environments exist in the pipelines, such as the bulk oil phase, bulk water phase, water-continuous emulsions, and oil-continuous emulsions, mainly depending on the watercut.…”

Section: Results and Discussionmentioning

confidence: 99%

Molecular Dynamics Study on the Spontaneous Adsorption of Aromatic Carboxylic Acids to Methane Hydrate Surfaces: Implications for Hydrate Antiagglomeration

Ning

et al. 2022

Energy Fuels

View full text Add to dashboard Cite

Spontaneous adsorption of aromatic carboxylic acids (phenylacetic acid, 2-napthylacetic acid, and 1-pyreneacetic acid) to the CH4 hydrate surface in both liquid hydrocarbon and aqueous phases has been investigated using molecular dynamics simulations, aiming to provide implications for hydrate antiagglomeration. Simulation results indicate that the liquid-phase environment, that is, the liquid hydrocarbon phase or aqueous phase, especially its hydrophilic/hydrophobic property, could profoundly affect the interfacial structures of CH4 hydrate and the adsorption behavior of aromatic carboxylic acids. In the hydrophobic hydrocarbon phase, with many CH4 molecules dissolved, more interfacial hydrate structures decompose and form a thin quasiliquid water film on the hydrate surface; aromatic carboxylic acids act as surfactants, that is, strongly adsorb to the hydrate/hydrocarbon interface and significantly lower the interfacial tension. Moreover, they adsorb to the interfacial water film on the hydrate surface with their carboxylic groups, which may destabilize the capillary liquid bridges formed among hydrate particles and then prevent hydrate coalescence. By contrast, fewer interfacial hydrate structures decompose in the aqueous phase, as CH4 molecules rarely dissolve in water but stay at the hydrate/water interface and stabilize the hydrate solid; only a few aromatic carboxylic acids adsorb to the hydrate/water interface by inserting their aromatic rings into the semicages on the hydrate surface, which may kinetically disturb the hydrate growth. Such adsorption is not very strong and mainly depends on the size matching between aromatic rings and semicages. Consequently, many more aromatic carboxylic acid molecules strongly adsorb to the hydrate surface in the hydrocarbon phase than in the aqueous phase, which can explain why antiagglomerants generally show a higher performance in the hydrocarbon phase and easily lose efficacy at high watercuts. Additionally, the molecular structures could also affect the adsorption behavior of aromatic carboxylic acids: with more aromatic rings, acid molecules can form stable aggregates via the π–π stacking interactions of the aromatic rings, adversely affecting the adsorption in the aqueous phase.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Molecular Dynamics Study on the Spontaneous Adsorption of Aromatic Carboxylic Acids to Methane Hydrate Surfaces: Implications for Hydrate Antiagglomeration

Ning

et al. 2022

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The later is vital for boosting hydrate formation kinetics, which is meaningful for hydratebased gas storage and gas separation. 89,208 However, this potential dual-function of hydrophobic coating requires sufficient cares when applying hydrophobic coating in hydrate processes. In particular, it is required to identify whether the nucleation or adhesion of hydrate is being concerned.…”

Section: ■ Prospects and Challengesmentioning

confidence: 99%

“…It is noted that hydrophobic coating of solid surfaces not only results in a reduction of hydrate adhesion forces as discussed but also might lead to a faster hydrate nucleation if the hydrate-forming conditions are provided. The later is vital for boosting hydrate formation kinetics, which is meaningful for hydrate-based gas storage and gas separation. , However, this potential dual-function of hydrophobic coating requires sufficient cares when applying hydrophobic coating in hydrate processes. In particular, it is required to identify whether the nucleation or adhesion of hydrate is being concerned.…”

Section: Prospects and Challengesmentioning

confidence: 99%

Surface Science in the Research and Development of Hydrate-Based Sustainable Technologies

Nguyen

et al. 2022

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Compact gas inclusion in hydrates presents not only fascinating science but also wide-ranging applications in sustainable energy and environmental technologies. The surface of hydrates dictates many essential phenomena underlying hydrate-based processes such as hydrate nucleation and growth, mass transfer, heat transfer, agglomeration, adhesion, and adsorption. Thus, surface science falls within the core of hydrate science and engineering. This paper covers an insight perspective on surface science related to the research and development of hydrate-based sustainable technologies. We present insightful molecular views of hydrate surfaces with a focus on the interfacial premelting, and discuss how new fundamental advances benefit the sustainable engineering in the areas of greener and chemical-free flow assurance, energyefficient gas storage, carbon capture and storage, and recovery of methane (low-carbon energy) from natural hydrates. We highlight the prospects and challenges as well as stimulate future studies on this important topic.

show abstract

“…Clathrate hydrates are crystallized solid compounds (icelike) formed , by the combination of small hydrocarbons with water at low temperatures (0–10 °C) and high pressures (3–10 MPa) . These crystalline solids consist of a lattice in which water acts as host and either a liquid (tetrahydrofuran, cyclopentane) or a gas (e.g., CH 4 , C 2 H 6 , C 3 H 8 , CO 2 ) acts as a guest molecule. − The host forms a cage-like structure via hydrogen bonding of water molecules.…”

Section: Introductionmentioning

confidence: 99%

Durable Hydrate-phobic Coating with In Situ Self-Replenishing Hydrocarbon Barrier Films for Low Clathrate Hydrate Adhesion

Jamil

Tao²,

Ahmed

et al. 2022

Langmuir

View full text Add to dashboard Cite

Clathrate hydrate growth, deposition, and plug formation during oil and gas transportation causes blockage of pipelines. An effective strategy to solve this problem is to mitigate the hydrate formation and reduce its adhesion on pipe walls through a coating process. However, durability failure, corrosion, inability to self-heal, high cost, and strong hydrate adhesion remain unsolved issues. To address these challenges, in this work, we present an in situ self-replenishing nonfluorinated durable hydrate-phobic coating of candle soot particles. The candle soot coating reduces hydrate adhesion by promoting a thick barrier film of hydrocarbons between the hydrate and the soot coated substrate. The hydrocarbons permeating the soot coating display a high contact angle for water and inhibit the formation of water bridges between the hydrate and soot coated substrate. The spherical cyclopentane hydrate slides off easily on the candle soot coating inside the cyclopentane environment. The hydrate former, cyclopentane–water emulsion, and THF–water mixture have high contact angles as well as low hydrate adhesion on soot coating simultaneously. In addition, the coating is flow-induced long-term slippery, durable, low cost, anticorrosion, self-cleaning, and suitable for practical applications.

show abstract

Anti-gas hydrate surfaces: perspectives, progress and prospects

Abstract: Mitigating gas-hydrate formation and the subsequent gas-pipeline plugging is of critical importance for ensuring both flow assurance and safety in the exploration and transportation of deep-water resources. Until now, active...

Cited by 16 publications

References 214 publications

Molecular Dynamics Study on the Spontaneous Adsorption of Aromatic Carboxylic Acids to Methane Hydrate Surfaces: Implications for Hydrate Antiagglomeration

Molecular Dynamics Study on the Spontaneous Adsorption of Aromatic Carboxylic Acids to Methane Hydrate Surfaces: Implications for Hydrate Antiagglomeration

Surface Science in the Research and Development of Hydrate-Based Sustainable Technologies

Durable Hydrate-phobic Coating with In Situ Self-Replenishing Hydrocarbon Barrier Films for Low Clathrate Hydrate Adhesion

Contact Info

Product

Resources

About