Cyclodextrins as eco-friendly nucleation promoters for methane hydrate

Asadi, Fariba; Metaxas, Peter J.; Lim, Vincent W.S.; Nguyen, Tuan A.H.; Aman, Zachary M.; May, Eric F.; Nguyen, Anh V.

doi:10.1016/j.cej.2020.127932

Cited by 21 publications

(11 citation statements)

References 43 publications

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“…Over the past three years, an array of these HPS-ALTA cells have been used to record thousands of hydrate formation events, across the range of accessible shear rates and compositions. , Efforts by Metaxas et al configured these cells to study induction time, which enabled a new probabilistic input for field-scale simulation with the above-described mechanistic model; the most recent efforts by Lim and co-workers , and Barwood et al have extended this induction time approach to study various KHIs as a function of concentration, with suggestions that systems containing KHI may not follow classical nucleation theory, which the HPS-ALTA system successfully established for pure guest–water systems . Together, the unique experimental capability and mechanistic model provide a means by which both the probability and severity of a hydrate formation event may be calculated.…”

Section: Structure–function Inhibitor Developmentmentioning

confidence: 99%

Hydrate Risk Management in Gas Transmission Lines

Aman

2021

Energy Fuels

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Gas hydrates are ice-like solids that can readily form and restrict flow in high-pressure natural gas transmission lines. The use of antifreeze thermodynamic inhibitors dominated production systems throughout the 20th century, where most research necessarily focused on measuring and predicting the hydrate phase boundary. In the 21st century, market competitiveness and environmental constraints have motivated a paradigm shift toward the identification and management of hydrate blockage risks, which has largely been facilitated to date through two research efforts: establishing and continuously refining mechanistic models to predict hydrate blockage formation; and exploiting critical stages within that blockage mechanism to develop novel, environmentally compatible inhibitors. This review presents a historical perspective on the development of an oil-dominant blockage mechanism and the technologies enabled by these efforts. Efforts over the past decademade possible through the collaboration between industry, the Australian government, and academiaare then summarized in the context of producing the first mechanistic blockage model for gas-dominant transmission lines, including the role of innovative high-pressure pilot-scale flowloop systems. Together, these blockage mechanisms have enabled new opportunities to develop and deploy low-dosage hydrate inhibitorsincluding the creation of new experimental capabilities that can be used to quantify occurrence probability or severity and the transient simulation tools that can leverage such knowledgethat support the ability to quantitatively manage hydrate blockage risk in hydrocarbon transmission lines. As they offer superior resolution in performance assessment to first-generation approaches, these new experimental methods offer structure–function design and optimization of low-dosage inhibitors against secondary, environmental parameters.

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Section: Structure–function Inhibitor Developmentmentioning

confidence: 99%

Hydrate Risk Management in Gas Transmission Lines

Aman

2021

Energy Fuels

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“…3 As a potential natural gas storage and transportation technology, methane hydrate has some advantages, such as low cost 4 and high safety. 5 However, gas hydrate still cannot meet the technological and engineering requirements of storing and transporting natural gas due to some limitations. It was demonstrated that the formation of gas hydrate in the static system of pure water lasted weeks or even months and had a low water conversion rate of 1.4−14%.…”

Section: Introductionmentioning

confidence: 99%

Promotion Effect of Copper Nanowire-Doped SDS in Methane Hydrate Formation

et al. 2022

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To speed up the formation of methane hydrate, copper nanowires (CuNWs) doped with sodium dodecyl sulfate (SDS) were used as a promotor. Transmission electron microscopy (TEM) images and elemental analysis of copper, oxygen, and sulfur indicated that SDS was successfully doped on the surface of copper nanowires. Compared with the SDS solution, the average hydrate induction time required for CuNW-SDS was significantly shortened from 71.25 ± 22.41 to 12 ± 4.89 min due to the strong thermal conductivity of copper nanowires. When SDS was used, the hydrate growth rates were about 0.56 ± 0.25 mmol/min. For CuNW-SDS, the hydrate growth rate was increased to 1.04 ± 0.53 mmol/min, which indicated that CuNW-SDS with better dispersibility enhanced the hydrate growth rate over 86% compared to that of SDS. In addition, when CuNW-SDS was used as a promoter, there were more dense hydrates, fewer foams generated by dissociation, and excellent recycling performance in the process of methane hydrate formation and dissociation.

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“…However, the rate of hydrate formation and the high degree of conversion of water to hydrate are critical technological parameters for hydrate-based technology . Thus, kinetic GHPs can be more effective because they increase the hydrate formation rate without affecting thermodynamics conditions, leaving the hydrate structure unchanged. , Anionic, cationic, and nonionic surfactants, ,, proteins, amino acids, − some ionic liquids, metal nanoparticles, − and such natural compounds as starches, cyclodextrin, and derivatives of celluloses are the most studied kinetic GHPs. These promoters particularly reduce the formation time of gas hydrates (nucleation time) and increase the growth rate of hydrate crystals. , …”

Section: Introductionmentioning

confidence: 99%

Sulfonated Castor Oil as an Efficient Biosurfactant for Improving Methane Storage in Clathrate Hydrates

Farhadian

Stoporev

Varfolomeev

et al. 2022

ACS Sustainable Chem. Eng.

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High toxicity and huge foaming are two severe challenges for gas storage strategies based on promoting the gas hydrate formation using surfactants. The present study used castor oil as an eco-friendly resource to develop novel biosurfactants for methane storage. Transmission and scanning electron microscopy, dynamic light scattering, and interfacial tension measurements revealed the surfactant properties of sulfonated castor oil (SCO). In addition, a high-pressure autoclave and a microdifferential scanning calorimeter test unveiled SCO as an effective kinetic hydrate promoter. The results showed that SCO significantly enhanced the rate of methane hydrate formation. A maximum of 76% water-tohydrate conversion was observed in 0.1 wt % SCO solution under stirring conditions. Pure water, 0.1 wt % SCO, and 0.1 wt % sodium dodecyl sulfate (SDS) solutions allowed 50% conversion to be achieved for 329, 39, and 27 min, respectively. This made the castor oil-based reagent as effective as the well-known kinetic hydrate promoter SDS. Furthermore, the SCO solution's foam ratio and stability were 8.25 and 2.75 times lower than those of SDS. Additionally, SCO showed a more favorable safety profile for humans and the environment as it is toxic to animals in higher concentrations than SDS according to in vivo studies. In addition, a combination of high-pressure DSC, low-temperature powder Xray diffractometry, and visual analysis of hydrate samples depending on the temperature mode, promoter type, and its concentration revealed that SCO and SDS enhanced hydrate growth by different mechanisms. The loose hydrate mass was squeezed out toward the gas phase in both cases. However, in the case of SDS, the hydrate traditionally climbed the cell walls while SCO seemed to change the wall wettability, which led to the transfer of water into the reaction zone along with the forming hydrate crystals and the domed shape of the hydrate. These findings provide reliable evidence to synthesize efficient and environmentally friendly reagents based on castor oil to improve methane storage in the clathrate hydrate.

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Cyclodextrins as eco-friendly nucleation promoters for methane hydrate

Cited by 21 publications

References 43 publications

Hydrate Risk Management in Gas Transmission Lines

Hydrate Risk Management in Gas Transmission Lines

Promotion Effect of Copper Nanowire-Doped SDS in Methane Hydrate Formation

Sulfonated Castor Oil as an Efficient Biosurfactant for Improving Methane Storage in Clathrate Hydrates

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