Liquid-Liquid Extraction Studies

Garner, F. H.; Skelland, A. H. P.

doi:10.1021/ie50534a604

Cited by 3 publications

(2 citation statements)

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“…The prevalent mechanism in this process is a continue adsorption-desorption equilibrium of surface-active material on the bubble-water interface. The velocity of a single rising bubble in a surfactant solution depends on the distance covered, as well as, the time elapsed across a pathway from its release-point [51][52][53][54][55][56]. When surfactant is adsorbed on the surface of a gas-bubble rising, surface-bubble is less mobile, friction increases, and consequently, rising-bubble velocity decreases [57,58].…”

Section: Gas Bubble Extractionmentioning

confidence: 99%

n-Alkanes, PAHs and surfactants in the sea surface microlayer and sea water samples of the Gerlache Inlet sea (Antarctica)

Stortini

Martellini

Bubba

et al. 2009

Microchemical Journal

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a b s t r a c t a r t i c l e i n f oSea surface microlayer (SML) and sea water samples (SSW) collected in the Gerlache Inlet Sea (Antarctica) were analysed for n-alkanes and polycyclic aromatic hydrocarbons (PAHs). The SML is a potential enrichment site of hydrophobic organic compounds compared to the underlying water column. Total concentration ranges of n-alkanes and PAHs (dissolved and particulate) in subsurface water (− 0.5 m depth) were 272-553 ng l − 1 (mean: 448 ng l − 1 ) and 5.27-9.43 ng l − 1 (mean: 7.06 ng l − 1 ), respectively. In the SML, the concentration ranges of n-alkanes and PAHs were 353-968 ng l − 1 (mean: 611 ng l − 1 ) and 7.32-23.94 ng l − 1 (mean: 13.22 ng l − 1 ), respectively. To evaluate possible PAH contamination sources, specific PAH ratios were calculated. The ratios reflected a predominant petrogenic input. A characterisation of surface active substances was also performed on SML and SSW samples, both by gas bubble extraction, and by dynamic surface tension measurements. Results showed a good correlation between n-alkanes, PAHs and refractory organic matter.

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Section: Gas Bubble Extractionmentioning

confidence: 99%

n-Alkanes, PAHs and surfactants in the sea surface microlayer and sea water samples of the Gerlache Inlet sea (Antarctica)

Stortini

Martellini

Bubba

et al. 2009

Microchemical Journal

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“…[4,5] The time taken by oil droplets to reach the surface depends chiefly on their size and shape which is affected by the presence of dispersants. The presence of dispersant changes the interfacial properties and strongly influences dynamics of the droplets.…”

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confidence: 99%

Effect of surfactant on the dynamics of a crude oil droplet in water column: Experimental and numerical investigation

et al. 2014

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In this study we have investigated the effect of surfactant, sodium dodecyl sulfate (SDS), on the dynamics of a single crude oil droplet, rising in a quiescent water column. Experiments were conducted in a tank, in which an oil droplet was released into a stagnant water column through a nozzle. The droplets ranging from 0.3 to 0.85 cm were produced from three different sized nozzles. The shape adopted by the emanating droplets varied from spherical to oblate. SDS concentrations were varied from 0 to 750 ppm in water. The adsorption of surfactant reduced the interfacial tension at oil-water interface which resulted in generation of smaller sized droplets at the nozzle and caused the droplet to flatten. Consequently, the rise velocities of droplets decreased.A numerical model based on finite volume method was developed using commercial CFD package ANSYS Fluent 1 . The model employed volume of fluid method, suggested by Hirt and Nichols (Journal of Computational Physics 1981, 39, 201), with an interface reconstruction technique based on piecewise linear representation for tracking the oil-water interface. The influence of surface tension on the droplet dynamics was captured by including Continuum Surface force (CSF) approach suggested by Brackbill, Kothe, and Zemach (Journal of Computational Physics 1992, 100, 335). The shape and rise velocities predicted from model were in good agreement with experimental data. The results from simulations were used, to analyze the wake structure and pressure distribution around the droplet. It was found that the smaller droplets which ascended in rectilinear path were associated with an axisymmetric wakes whereas larger and intermediate sized droplets in high SDS concentration wobbled as they ascended because of asymmetric wakes.

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Study on mass transfer using nanofluid drops in liquid-liquid extraction column.

Dhindsa

Sobti

Wanchoo

et al. 2022

International Communications in Heat and Mass Transfer

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Liquid-Liquid Extraction Studies

Cited by 3 publications

References 0 publications

n-Alkanes, PAHs and surfactants in the sea surface microlayer and sea water samples of the Gerlache Inlet sea (Antarctica)

n-Alkanes, PAHs and surfactants in the sea surface microlayer and sea water samples of the Gerlache Inlet sea (Antarctica)

Effect of surfactant on the dynamics of a crude oil droplet in water column: Experimental and numerical investigation

Study on mass transfer using nanofluid drops in liquid-liquid extraction column.

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