Study on the kinetic characteristics of gas hydrate in the dioctyl sodium sulfosuccinate system

Lv, Xiaofang; Jing, Shu; Zhao, Dan; Lu, Dayong; Yang, Liu; Ma, Qianli; Song, Shangfei; Zhou, Shidong

doi:10.1039/d1ra06966g

Cited by 1 publication

(2 citation statements)

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“…As a result, at high pressures (>5 MPa) and low temperatures (>2 °C ), the partial pressure of the CH₄ gas decreases due to the rapid drop in temperature, and the results in Figures 5b and 6 support this interpretation. Nevertheless, the IP, SDS, and IP + SDS liquid systems form an sH hydrate structure, wherein methane molecules fill the remaining small and medium cages and IP can only occupy the large cages [12]. As a result, the greater availability of hydrate cages in the sH hydrate structure for methane capture is associated with the higher methane gas uptake in the water sample with isopentane.…”

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

confidence: 99%

“…Due to its salinity, the phase equilibrium curve for hydrate formation shifts in favor of higher pressure and lower temperature. Two strategies have been put forth to address this problem: using binary hydrate formers and thermodynamic promoters [10][11][12]. Thermodynamic promoters are additives that are used to facilitate hydrate formation under simpler operating conditions (primarily at higher temperatures and lower pressures) in order to reduce operating expenses.…”

Section: Introductionmentioning

confidence: 99%

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

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

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Study on the kinetic characteristics of gas hydrate in the dioctyl sodium sulfosuccinate system

Abstract: Surfactants promote the production of hydrates, which provide a possibility for the industrialization of hydrate technology.

Cited by 1 publication

References 38 publications

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

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

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