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

Bamaga, Omar; Moujdin, Iqbal Ahmed; Wafiyah, Asim M.; Albeirutty, Mohammed; Abulkhair, Hani; Shaiban, Amer; Linga, Praveen

doi:10.3390/en15249652

Cited by 4 publications

(3 citation statements)

References 49 publications

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“…On the temperature interval of 273.65-275.15 K, the gas consumption obtained for sodium surfactin was quite similar to those obtained for rhamnolipids and sodium dodecyl sulfate for concentrations at 1500, 2000, and 2500 ppm, herein the additives played the role of methane hydrate promoters. The additives were confirmed to reduce the interfacial surface tension; accordingly, the methane solubility in the liquid phase was improving, and a high amount of dissolved methane in the liquid phase was able to subsequently occupy cage structures formed by water [52,59].…”

Section: Gas Uptakementioning

confidence: 96%

Evaluation of Temperature on the Methane Hydrates Formation Process Using Sodium Surfactin and Rhamnolipids

Pavón-García,

Zúñiga-Moreno,

García-Morales

et al. 2023

Energies

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The performance of chemical and biological additives in the methane hydrates formation and dissociation processes is of relevance for the development of gas-transport and gas-storage systems. The effect of sodium surfactin, rhamnolipids, and sodium dodecyl sulfate (SDS) on the methane hydrate formation process was assessed in this work at different temperatures and a fixed pressure of 50 bar. The studied parameters were induction time, methane uptake, period to reach 90 percent of the consumed gas, water-to-hydrate conversion, and formation rate. Concentrations for sodium surfactin were 3, 150, 750, 1500, 2000, and 2500 ppm, while rhamnolipids and SDS solutions were analyzed at 1500, 2000, and 2500 ppm. Performance testing of these additives was carried out by means of the isochoric–isothermal method. The experimental setup consisted of an isochoric three-cell array with 300 mL of capacity and magnetic stirring. According to the results, the sodium surfactin promoted the methane hydrate formation since the kinetics were higher and the water-to-hydrate conversion averaged 24.3%; meanwhile, the gas uptake increased as concentration was rising, and the induction time was reduced even at a temperature of 276.15 K.

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Section: Gas Uptakementioning

confidence: 96%

Evaluation of Temperature on the Methane Hydrates Formation Process Using Sodium Surfactin and Rhamnolipids

Pavón-García,

Zúñiga-Moreno,

García-Morales

et al. 2023

Energies

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“…This methodology, which provides information over a large range of molecular to macroscopic scales, is implemented with two prototypical surfactant promoters, SDS (sodium dodecyl sulfate) and AOT (dioctyl sulfosuccinate sodium salt or AerosolOcTyl). SDS is a benchmark promoter, to which other surfactant promoters are usually compared; ,, it is often used in combination with other additives, including thermodynamic promoters, , solid porous or nonporous particles, − or soil organic matter …”

Section: Introductionmentioning

confidence: 99%

Growth Kinetics and Porous Structure of Surfactant-Promoted Gas Hydrate

Samar,

Venet,

Desmedt

et al. 2024

ACS Omega

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Surfactants present in tiny amounts in the aqueous phase are known to be efficient gas hydrate promoters; yet, the promotion mechanisms are still not fully understood. Understanding and directing those mechanisms is key to the implementation of gashydrate-based applications such as gas storage and separation, secondary refrigeration or water treatment, and desalination. In this work, the growth at the water/gas interface and the porous structure of surfactant-promoted methane hydrate are observed by optical microscopy and Raman imaging in glass capillaries used as optical cells. Hollow crystals are continuously generated and expelled from the methane/water meniscus into the water or surfactant solution, where they ultimately form the skeleton of a porous medium filled with the solution. Unprecedented information is gathered over a range of scales from the molecular scale (crystal structure and cage filling) to the mesoscale (crystal morphologies, growth habits and pore sizes) and macroscale (rates and amounts of water and gas converted into hydrate and hydrate porosity). Following an early steady-state growth regime, a sudden order-of-magnitude increase of the conversion rate occurs, which is related to gaseous methane microbubbles being directly incorporated across the meniscus in the aqueous solution and later converted to methane hydrate. An assessment and comparison are made of the mechanisms and performance of two common anionic surfactants known to be efficient gas hydrate promoters, SDS (sodium dodecyl sulfate) and AOT (dioctylsulfosuccinate sodium or AerosolOcTyl). AOT provides a quicker but more limited conversion into hydrate than SDS, suggesting that it is more appropriate for continuous flow processes while SDS is better suited for gas storage applications. Raman spectra reveal that cage filling by methane of structure I methane hydrate is not affected by surfactants.

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“…It has been proved that the formation and dissociation process of a hydrate is simple; there is almost no mass loss, no environmental protection problem, and the gas storage capacity is large [1,2]. Therefore, hydrate-based technologies have shown great application potential in cold storage [3][4][5][6], gas separation [7,8], storage and transport of gases [9,10], and seawater desalination [11,12], etc. However, the characteristics of poor gas-liquid interface, the randomness of nucleation, the low rate of nucleation, and crystal growth are the key problems that restrict the fast formation of hydrate and its technology application to energy storage.…”

Section: Introductionmentioning

confidence: 99%

Fast Formation of Hydrate Induced by Micro-Nano Bubbles: A Review of Current Status

et al. 2023

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Hydrate-based technologies have excellent application potential in gas separation, gas storage, transportation, and seawater desalination, etc. However, the long induction time and the slow formation rate are critical factors affecting the application of hydrate-based technologies. Micro-nano bubbles (MNBs) can dramatically increase the formation rate of hydrates owing to their advantages of providing more nucleation sites, enhancing mass transfer, and increasing the gas–liquid interface and gas solubility. Initially, the review examines key performance MNBs on hydrate formation and dissociation processes. Specifically, a qualitative and quantitative assembly of the formation and residence characteristics of MNBs during hydrate dissociation is conducted. A review of the MNB characterization techniques to identify bubble size, rising velocity, and bubble stability is also included. Moreover, the advantages of MNBs in reinforcing hydrate formation and their internal relationship with the memory effect are summarized. Finally, combining with the current MNBs to reinforce hydrate formation technology, a new technology of gas hydrate formation by MNBs combined with ultrasound is proposed. It is anticipated that the use of MNBs could be a promising sustainable and low-cost hydrate-based technology.

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

Cited by 4 publications

References 49 publications

Evaluation of Temperature on the Methane Hydrates Formation Process Using Sodium Surfactin and Rhamnolipids

Evaluation of Temperature on the Methane Hydrates Formation Process Using Sodium Surfactin and Rhamnolipids

Growth Kinetics and Porous Structure of Surfactant-Promoted Gas Hydrate

Fast Formation of Hydrate Induced by Micro-Nano Bubbles: A Review of Current Status

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