High-efficiency gas storage via methane-tetrahydrofuran hydrate formation: Insights from hydrate structure and morphological analyses

Jiang, Lanlan; Cheng, Zucheng; Li, Shaohua; Xu, Nan; Xu, Huazheng; Zhao, Jiafei; Liu, Yu; Yu, Minghao; Song, Yongchen

doi:10.1016/j.fuel.2021.122494

Cited by 13 publications

(10 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the upward-growing hydrate generated a thin film covering the window, as shown in Figure d,e. A similar phenomenon was also reported in other publications. , On the contrary, as described above, in the CDA-contained system, the hydrates that grew on the wall were thick as well as they gathered downward intensely (Figure d,e). In addition, it was clearly observed from Figure e that the height of the interface between the hydrate and liquid phase just slightly dropped at 10 min, compared with Figure c.…”

Section: Resultssupporting

confidence: 90%

“…However, the needs of hydrate rapid formation could not be satisfied only by adding THPs in most cases, especially for the static conditions. For instance, Yang et al showed a slow CH 4 /THF hydrate formation kinetic curve at 283.2 K and 3 MPa, as well as Jiang et al also reported a mild formation process for CH 4 /THF hydrate at 288.2 K and 4 MPa. Therefore, it is necessary for researchers to add some kinetic hydrate promoters (KHPs) to further accelerate hydrate formation. − A conventional KHP sodium dodecyl sulfate (SDS) is widely used in hydrate formation which can reduce the interfacial tension of gas–liquid .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Methane Storage by Forming sII Hydrate in the Presence of a Novel Kinetic Promoter with the Function of Alleviating the Wall-Climbing Growth

Tan

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

Storing methane by forming structure II hydrate in the presence of thermodynamic hydrate promoters gains extensive attention due to the moderate operation conditions. Although the reaction rate and gas uptake can be improved by adding kinetic hydrate promoters (KHPs), the concomitant wall-climbing effect often leads to reactors and even pipelines being filled with hydrate. Therefore, in this study, a novel kind of KHPs [cocamidopropyl dimethylamine (CDA)] was developed to promote CH 4 / tetrahydrofuran (THF, 5.56 mol %) hydrate formation and alleviate the hydrate wall-climbing growth. Results showed that the hydrate formation rate enhanced, and the induction time decreased as the CDA concentration increased. The largest CH 4 storage capacity achieved was 107.78 ± 1.89 v/v (the volume ratio of gas to hydrate, and the theoretical value is 115 v/v) at 283.15 K and at an initial pressure of 7.2 MPa, which was obtained at the CDA concentration of 0.2 wt %. The evolutionary morphologies of hydrate growth in the presence or absence of CDA were observed during the initial formation stage, confirming the great promotion effect of CDA on CH 4 /THF hydrate formation. The hydrate formed in the systems without CDA filled up the entire window, while the wall-climbing effect was significantly alleviated in the CDA-contained systems. As far as we know, this is the first time to report that a KHP (CDA) has the dual function of enhancing hydrate formation kinetics and alleviating its upward growth. In addition, the effect of CDA and L-tryptophan (L-Trp) on hydrate formation was compared at their optimal dosages under the currently experimental conditions, and the results indicated that CDA performed better in terms of hydrate induction time, formation rate, gas uptake, and wall-climbing height.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Methane Storage by Forming sII Hydrate in the Presence of a Novel Kinetic Promoter with the Function of Alleviating the Wall-Climbing Growth

Tan

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…Therefore, safe, efficient, and flexible transportation methods are necessary to meet the NG growing demand. In the traditional methods of transporting NG, including liquefied natural gas, compressed natural gas, and adsorbed natural gas, operating conditions are challenging, safety hazards exist, and the energy consumption is high. − The solidified natural gas (SNG) approach has been newly introduced for NG storage and transportation, which encapsulates NG as a solid hydrate form. SNG has the advantages of flexibility, no explosion, low cost, high storage capacity (∼170 v/v), and easy recovery with a nearly 100% gas recovery rate .…”

Section: Introductionmentioning

confidence: 99%

Novel Amino Acid Derivatives for Efficient Methane Solidification Storage via Clathrate Hydrates without Foam Formation

et al. 2023

View full text Add to dashboard Cite

Although anionic surfactants are considered the most efficient kinetic gas hydrate promoters for gas storage applications, gas recovery and reuse of surfactants are difficult due to high foam formation during hydrate melting. Additionally, most anionic surfactants are toxic, which has an intense environmental effect. In this study, novel amino acid derivatives (ACDs) were developed as the first class of superior promoters compared to surfactants without foaming during the formation and recovery of gas hydrates. The results of high-pressure autoclave experiments indicated that all ACDs significantly enhanced the kinetics of methane hydrate formation at 500 ppm. ACD5 derived from leucine showed the best promotion effect in distilled water by providing a total mole consumption of 436.1 mmol. ACD5 increased the degree of water-to-hydrate conversion from 39.6% in pure water to 94.3%, which was higher than in sodium dodecyl sulfate (SDS) solution (87.8%). Moreover, differential scanning calorimetry experiments demonstrated that ACDs could form methane hydrates at relatively lower temperatures than pure water. They increased the onset temperature of methane hydrate formation from −15 °C in pure water to −12 °C at 500 ppm. A higher promotion activity than SDS was also observed for ACDs in salt water, suggesting that seawater can be used to produce methane hydrate instead of pure water to reduce gas storage costs. Besides, visual observations revealed that no foam was formed during melting hydrates and releasing methane in the presence of ACDs. These findings show that a slight modification of amino acids makes them efficient candidates for improving gas hydrate formation for seawater desalination and gas storage applications.

show abstract

“…However, the slow kinetics of gas hydrate formation is one of the most serious obstacles to implementing this technology. − Therefore, the hydrate community has focused on using special additives, namely, gas hydrate promoters (GHPs), that can accelerate the hydrate formation. , GHPs are divided into thermodynamic and kinetic types . Thermodynamic GHPs such as tetrahydrofuran, tetra- n -alkyl ammonium halides, and cyclopentane alter the equilibrium conditions of gas hydrate formation toward higher temperatures and lower pressures. − This means that they provide milder conditions for the hydrate formation, but the gas capacity of the hydrate decreases . However, the rate of hydrate formation and the high degree of conversion of water to hydrate are critical technological parameters for hydrate-based technology .…”

Section: Introductionmentioning

confidence: 99%

“…38−41 This means that they provide milder conditions for the hydrate formation, but the gas capacity of the hydrate decreases. 42 However, the rate of hydrate formation and the high degree of conversion of water to hydrate are critical technological parameters for hydratebased technology. 43 Thus, kinetic GHPs can be more effective because they increase the hydrate formation rate without affecting thermodynamics conditions, leaving the hydrate structure unchanged.…”

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.

View full text Add to dashboard Cite

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.

show abstract

High-efficiency gas storage via methane-tetrahydrofuran hydrate formation: Insights from hydrate structure and morphological analyses

Cited by 13 publications

References 46 publications

Methane Storage by Forming sII Hydrate in the Presence of a Novel Kinetic Promoter with the Function of Alleviating the Wall-Climbing Growth

Methane Storage by Forming sII Hydrate in the Presence of a Novel Kinetic Promoter with the Function of Alleviating the Wall-Climbing Growth

Novel Amino Acid Derivatives for Efficient Methane Solidification Storage via Clathrate Hydrates without Foam Formation

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

Contact Info

Product

Resources

About