Does SDS micellize under methane hydrate-forming conditions below the normal Krafft point?

Zhang, J.S.; Lee, S.; Lee, Jae Woo

doi:10.1016/j.jcis.2007.06.049

Cited by 87 publications

(73 citation statements)

References 18 publications

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“…3 Surfactants, such as SDS have been conrmed to promote hydrate formation efficiently. [4][5][6][7][8][9][10][11] In the deionized water system, according to Englezos et al, 12 hydrates initially formed as a thin lm at the gas/liquid interface and then grew downward as dendrites into the bulk water. The existence of the hydrate lm hindered the diffusion of gas into the aqueous phase and therefore resulted in slow hydrate formation.…”

Section: Introductionmentioning

confidence: 99%

Methane hydrate formation with surfactants fixed on the surface of polystyrene nanospheres

Wang

Luo

et al. 2015

J. Mater. Chem. A

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To improve the application of surfactants in methane hydrate formation, sodium dodecyl sulfate (SDS) was fixed on the surface of polystyrene nanospheres (named as SDS@PSNS). SDS@PSNS resulted in a shorter induction period of hydrate formation compared to SDS. With SDS@PSNS as a promoter, hydrates formed mainly at the bottom of the reactor with a much higher apparent density and higher methane consumption, and during the hydrate dissociation period, less foam was generated. In addition, the recycling experiments showed high stability and good recycling performance of SDS@PSNS in seven methane hydrate formation-dissociation cycles.

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Section: Introductionmentioning

confidence: 99%

Methane hydrate formation with surfactants fixed on the surface of polystyrene nanospheres

Wang

Luo

et al. 2015

J. Mater. Chem. A

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“…The hypothesis for increased rapid formation was that micelle formations created nucleation sites [6]. However this was not possible as the Kraft point for SDS is 16˚C which limits the solubility below the CMC [7]. As to the role of surfactants in rapid hydrate formation, it is still undeterminable.…”

Section: Introductionmentioning

confidence: 99%

Quick Assessment of Potential Hydrate Promoters for Rapid Formation

Lo¹,

Somasundaran²,

Lee³

2012

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Hydrate technology has advanced to greater proportions: implementing the high latent heats as refrigerant, safe carbon capture as carbon sequestration in hydrates, purifying rare gases in hydrates, and safe efficient transport of energy using rapid hydrate formation. These account for only a small amount of the fundamental understanding of gas hydrates and the use of such a novel technology. A quick and broad analysis of novel hydrate promoters is needed to assess the potential of other promoter agents. This will improve the understanding of rapid hydrate formation and fundamental ideas related to the kinetics and formation of hydrates. There are still hundreds of other surfactants that have not been identified for rapid formation. The insurmountable endeavor deters many from trying as it can be like finding a needle in a hay stack. This almost futile endeavor of correctly identifying a surfactant as a promoter agent without doing a formation test can be accomplished with recent techniques. Using Raman and a liquid hydrocarbon (Cyclo-pentane), surfactants may shift the sample's peak towards the hydrate peak (890 cm -1 ), thereby identifying it as a choice surfactant for rapid formation of hydrates. With a broad survey of surfactants, understanding fundamental science and engineering kinetics for hydrates will be easily achieved. Finding more effective and novel surfactants for hydrate formations will broaden the field of hydrates and self-assembling crystallization. As hydrate technology broadens, interdisciplinary fields can contribute expertise from surface science to spectroscopy leading to geological formations and engineering kinetics.

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“…The promoting effect of SDS on the enclathration is possibly due to the adsorption of DS À on the hydrate crystals [5]. Other anions, such as carbonate and bicarbonate, could compete with DS À for adsorption sites.…”

Section: Introductionmentioning

confidence: 99%