Batch extraction of amines using emulsion liquid membranes: Importance of reaction reversibility

Baird, R. S.; Bunge, Annette L.; Noble, Richard D.

doi:10.1002/aic.690330107

Cited by 49 publications

(14 citation statements)

References 10 publications

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“…Surfactant-stabilized emulsion liquid membrane processes constitute an emerging separation technology that has repeatedly been shown to be highly suited for such diverse separation processes as metal recovery or removal from dilute aqueous solutions (Gutknecht et al, 1986;Bart et al, 1986;Mikucki and Osseo-Asare, 1986a-c), separations in the food industry (Etuk and Murray, 19901, removal of organic bases and acids from water (Baird et al, 1987;Wang and Bunge, 1990), separation of hydrocarbons (Plucinski and Szust, 1988;Gupta et al, 1990), and pharmaceutical separations (Itoh et al, 1990;Thien et al, 1988). Some excellent recent reviews of the field include those by Frankenfeld and Li (1987), Noble and Way (19871, and Araki and Tsukube (1990).…”

Section: Introductionmentioning

confidence: 98%

A new solution to emulsion liquid membrane problems by non‐Newtonian conversion

Skelland¹,

Meng²

1996

AIChE Journal

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Section: Introductionmentioning

confidence: 98%

A new solution to emulsion liquid membrane problems by non‐Newtonian conversion

Skelland¹,

Meng²

1996

AIChE Journal

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“…Bunge and Noble proposed a way to approximate this effect using individual diffusion coefficients for the solute in the internal and membrane phases, the initial concentration of reagent, and the volume fraction of internal phase in the globule (96,97). Without any adjustable parameters, this reversible reaction model predicts batch extraction data from measurable physical parameters: diffusion coefficients, solute partition coefficients, and average globule size.…”

Section: Overview Of Technologymentioning

confidence: 97%

Liquid Membrane Technology

Noble

Way

1987

Liquid Membranes

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Liquid membrane technology is introduced and is identified as a subset of membrane science. A tutorial section discusses configurations, transport mechanisms, experimental techniques, and a survey of basic theoretical approaches. The concepts of reactive liquid membranes which combine traditional unit operations such as extraction or absorption with stripping are discussed. The chapters to follow in this volume are summarized and the subject of each is placed in perspective to the field of liquid membrane technology. TutorialA membrane can be viewed as a semi-permeable barrier between two phases. This barrier can restrict the movement of molecules across it in a very specific manner. The membrane must act as a barrier between phases to prevent intimate contact. The semi-permeable nature is essential to insuring that a separation takes place.There are two points to note concerning this definition. First, a membrane is defined based on what it does, not what it is. Secondly, a membrane separation is a rate process. The separation is accomplished by a driving force, not by equilibrium between phases (JO.By extending our definition of a membrane, we can include liquids. If we view a membrane as a semipermeable barrier between two phases, then an immiscible liquid can serve as a membrane between two liquid or gas phases. Different solutes will have different solubilities and diffusion coefficients in a liquid. The product of these two terms is a measure of the permeability. A liquid can yield selective permeabilities and, therefore, a separation. Because the diffusion coefficients in liquids are typically orders of magnitude higher than in polymers, a larger flux can be obtained.

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“…The plus sign on a\ and σ 2 distinguishes these definitions from a x and σ 2 presented in previous papers on batch extraction (39)(40)(41), which are based on the volume ratio (V e /V^) rather than the ratio of volumetric flow rates (v e /v b ). The distinction between batch and continuous extractors is only important when the ratio of volumetric flowrates (v e /v^) differ from the extractor volume ratio (Vg/V^).…”

Section: Emulsion Liquid Membrane Modelsmentioning

confidence: 97%

“…Batch ex tractions and calculations from this reversible reaction model de monstrate that reaction reversibility significantly affects extrac tion performance in some cases (39,40). In this paper, we extend these batch extraction calculations to a continuous stirred-tank extractor.…”

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confidence: 97%

Influence of Reaction Reversibility on Continuous-Flow Extraction by Emulsion Liquid Membranes

1987

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This paper examines theoretically the continuous flow extraction by emulsion globules in which the transferring solute reacts with an internal reagent. The reversible reaction model is used to predict performance. These results are compared with advancing front calculations which assume an irreversible reaction. A simple criterion which indicates the importance of reaction reversibility on performance is described. Calculations show that assuming an irreversible reaction can lead to serious underdesign when low solute concentrations are required. For low solute concentrations an exact analytical solution to the reversible reaction problem is possible. For moderate solute concentrations, we have developed an easy parameter adjustment of the advancing front model which reasonably approximates expected extraction rates. Emulsion liquid membranes (ELM) are double emulsions formed by mixing two immiscible phases and then dispersing the resulting emulsion in another continuous phase under agitation. Proposed applications for emulsion liquid membranes have included selective recovery of metal ions (1-12), separation of hydrocarbons (13-16), removal of trace organic contaminants (17-27), and encapsulation of reactive enzymes or whole cells (28-36).Nearly all of the large number of experimental and theoretical studies reported have been performed in batch mode. While the industrial significance of a continuous steady-state operation is obvious, only Hatton and coworkers have examined flow configurations both theoretically and experimentally (27,37,38). They considered the situation when a solute (A) diffuses through the oil phase membrane and then reacts with a reagent (B) trapped in the internal droplets to produce a product (P) according to,

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Batch extraction of amines using emulsion liquid membranes: Importance of reaction reversibility

Cited by 49 publications

References 10 publications

A new solution to emulsion liquid membrane problems by non‐Newtonian conversion

A new solution to emulsion liquid membrane problems by non‐Newtonian conversion

Liquid Membrane Technology

Influence of Reaction Reversibility on Continuous-Flow Extraction by Emulsion Liquid Membranes

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