Effect of Propane and NaCl-SDS Solution on Nucleation Process of Mine Gas Hydrate

Zhang, Qiang; Wu, Qiang; Zhang, Hui

doi:10.1155/2017/1059109

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…Additionally, it can be observed that the induction time for the mixed hydrate formation in the presence of 5.56 mol % THF and 3.5 wt % NaCl with SDS as a co-promoter is the shortest (about 3.7 ± 0.4 h). This is because the repulsion between the head groups of SDS is stabilized by ions via electrostatic interaction, resulting in a dramatic reduction of interfacial tension. ,, Although the presence of amino acids decreases the induction time, the performance is not equal to that of SDS. This is because the amino acid structure, which contains electrophilic and nucleophilic sites, interacts with salt ions, reducing the hydrogen interaction between ions and water and thus lowering interfacial tension.…”

Section: Resultsmentioning

confidence: 99%

Hydrate-Based Gas Storage Application Using Simulated Seawater in the Presence of a Co-Promoter: Morphology Investigation

et al. 2022

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The hydrate morphology pattern plays a critical role in the reactor design for hydratebased gas storage/separation technology. This work investigated the morphology of mixed methane− THF hydrate formation using salt water (3.5 wt % NaCl) instead of pure water at 288.2 K and 8 MPa. The result indicated that the nucleation occurred at the gas/liquid interface and then the hydrates grew along the wall of the crystallizer column. After a specific time interval, the hydrates gradually grew downward until they completely covered the bulk solution. This work applied 500 ppm of copromoters, including sodium dodecyl sulfate (SDS) and three amino acidsvaline, leucine, and methionine to improve the kinetics of mixed hydrate formation. The presence of SDS in the system resulted in distinct mixed hydrate formation patterns. After hydrate nucleation at the gas/liquid interface, most of the hydrates predominantly grew downward and enveloped the solution within a few minutes. Moreover, the mushy hydrates gradually transformed into stiff hydrates over time. Three amino acids resulted in the same hydrate patterns as those formed in the absence of a co-promoter, but the formation was completed more rapidly. The kinetic data indicated that using salt water for the formation of mixed methane−THF hydrates resulted in low hydrate formation kinetics. The presence of SDS significantly enhanced the kinetics of hydrate formation but decreased the final gas uptake by about one-half. Additionally, it was discovered that the presence of amino acids accelerated the hydrate formation kinetics while having a negligible effect on the final methane uptake.

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Section: Resultsmentioning

confidence: 99%

Hydrate-Based Gas Storage Application Using Simulated Seawater in the Presence of a Co-Promoter: Morphology Investigation

et al. 2022

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“…A study on methane hydrate formation without stirring using solutions of mixed NaCl (3 wt%) and SDS (0.1 wt%) found that the SDS micellization was diminished in NaCl solution, hence the promoting effect of SDS on hydrate formation is reduced [36]. While another study on propane/NaCl/SDS solution system showed a decreased induction time of hydrate formation in comparison with that for the SDS solution alone and hence, it was assumed that NaCl can increase the solubility of mine gas due to the presence of SDS micelles [37]. However, Ren et.…”

Section: Comparison Of P-t Profile Kinetics Of Ch 4 Gas Hydrate and T...mentioning

confidence: 99%

Studies on Methane Gas Hydrate Formation Kinetics Enhanced by Isopentane and Sodium Dodecyl Sulfate Promoters for Seawater Desalination

et al. 2022

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Methane hydrate applications in gas storage and desalination have attracted increasing attention in recent years. In the present work, the effect of isopentane (IP), sodium dodecyl sulfate (SDS), and IP/SDS blends as promoters on methane hydrate formation kinetics, in terms of the pressure–temperature (P‒T) profile, gas uptake, hydrate induction time (HIT), and water-to-hydrate conversion ratio (WHCR), were studied for distilled water and seawater samples with an IP/water sample ratio of 3:10 (by volume) and an SDS/water sample ratio of 1:1000 (by mass). Each solution was tested in a stirred tank at 600 rpm at a temperature and pressure of 2 °C and 5.2–5.3 MPa. In the case of methane hydrate formation in distilled water, the highest WHCR attained was 9.97% without additives, and 45.71% and 72.28% for SDS and isopentane additives, respectively. However, when using seawater at a salinity of 3.9%, the highest WHCR attained was 2.26% without additives and 9.89% and 18.03% for SDS and IP promoters, respectively, indicating the inhibiting effect of salinity on hydrate formation. However, the HIT was longer for seawater hydrate formation, with an average of 13.1 min compared to 9.90 min for methane hydrate formation. Isopentane enhances the HIT for methane hydrate formation in seawater by 2.23 times compared to SDS. For methane hydrate formation in seawater, the presence of IP shortened the HIT by 15.6 min compared to the seawater sample without promoters. Additionally, a synergistic effect was observed when IP and SDS were combined and used in methane hydrate formation in distilled water and seawater systems. The positive effect of IP on methane hydrate formation is possibly due to the binary hydrate formation mechanism, which improves the hydrate formation thermodynamic and kinetic parameters.

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Progress in use of surfactant in nearly static conditions in natural gas hydrate formation

Pan

Shang

et al. 2020

Front. Energy

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Effect of Propane and NaCl-SDS Solution on Nucleation Process of Mine Gas Hydrate

Cited by 4 publications

References 25 publications

Hydrate-Based Gas Storage Application Using Simulated Seawater in the Presence of a Co-Promoter: Morphology Investigation

Hydrate-Based Gas Storage Application Using Simulated Seawater in the Presence of a Co-Promoter: Morphology Investigation

Studies on Methane Gas Hydrate Formation Kinetics Enhanced by Isopentane and Sodium Dodecyl Sulfate Promoters for Seawater Desalination

Progress in use of surfactant in nearly static conditions in natural gas hydrate formation

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