Flüssigmembran‐Technik – Übersicht über Phänomene, Transportmechanismen und Modellbildungen

Marr, Rolf; Kopp, Andreas F.

doi:10.1002/cite.330520507

Cited by 60 publications

(6 citation statements)

References 62 publications

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“…The potassium ions can only come to the outer phase by emulsion leakage. Emulsion leakage is caused by different effects (Marr and Kopp, 1980). The potassium concentration in the outer phase was determined by atomic absorption spectroscopy.…”

Section: Enzyme Emulsionmentioning

confidence: 99%

Immobilization of enzymes in liquid membranes for enantioselective hydrolysis

et al. 1988

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The enantioselective hydrolysis of racemlc 4-acetoxy-cyclopentenone by immobilized enzymes is described. Liquid membrane emulsions were used to encapsulate the enzyme. This technique combines the specific enzymatic reaction with a selective transport through the organic phase. The product (-)-4-hydroxy-cycIopentenone was produced with an enantiomeric excess of 82%. The immobilization technique and all reaction steps, as well as a mathematical model for the complete process are discussed in this report.

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Section: Enzyme Emulsionmentioning

confidence: 99%

Immobilization of enzymes in liquid membranes for enantioselective hydrolysis

et al. 1988

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“…The effect of E on the extraction rate for small values of t is illustrated in Figure 6. Halwachs et al, 1980;Marr and Kopp, 1980;Terry et al, 1981), and is characterized by a simple extraction chemistry: the phenol diffuses through the membrane (oil) phase of the emulsion, and reacts instantaneously and irreversibly with the internal reagent (NaOH) to form the oil-insoluble sodium phenolate.…”

Section: Convergence Of Perturbation Sequencementioning

confidence: 99%

Batch extraction with liquid surfactant membranes: A diffusion controlled model

et al. 1982

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A model of diffusion controlled mass transfer in liquid surfactant membranes is developed for uniform emulsion globules having no internal circulation. The solute is assumed to react instantaneously and irreversibly with the internal reagent a t a reaction surface which advances into the globule as the reagent is consumed. A perturbation solution to the resulting non-linear equations is presented. In general, the zero-order, or pseudo-steady state solution alone often gives an adequate representation of the process. Experimental data on the batch extraction of phenol from waste water are in good agreement with the model predictions.

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“…Selective ion transport through liquid membrane is hoped to be a next generation separation method for industrial metal recovery (1,2). Much research has been concerned with metal ion transport reactions which are driven by a pH gradient.…”

Section: Introductionmentioning

confidence: 99%

“…Much research has been concerned with metal ion transport reactions which are driven by a pH gradient. Two aqueous solutions of different hydrogen ion concentrations were separated by an organic liquid membrane containing a carrier compound (2).…”

Section: Introductionmentioning

confidence: 99%

Transport of Iron and Cobalt Complex Ions through Liquid Membrane Mediated by Methyltrioctylammonium Ion with the Aid of Redox Reaction

Ohki

Hinoshita

Takagi

et al. 1983

Separation Science and Technology

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A new type of carrier-mediated metal transport through liquid membrane is presented. The system involves redox reactions rather than acid-base reactions which have often been utilized in metal transport systems, Iron ion was selectively transported and concentrated through the membrane via a chloride complex by use of a lipophilic quaternary ammonium ion, rnethyltrioctylammonium (MTOA. Q'). as a carrier. The two aqueous solutions of different redox potentials were separated by a polymer-supported liquid membrane in which MTOA .chloride (Q+ .CI-) was dissolved as the carrier. Iron(l1l) ion in hydrochloric acid media formed a FeCIT type complex which was readily extracted to the organic membrane phase as an ion-pair complex Q + . F e C k . On contact with a reducing agent on the other side of the membrane. iron(1ll) was reduced to iron(I1) and liberated into aqueous solution; the chloride complexes of iron( 11) are too hydrophilic to stay in the membrane phase. On the other hand. cobalt ion was transported via nitrilotriacetic acid (NTA) complex by MTOA carrier in a similar manner to the iron transport. The nature of the transport reactions was studied under various operational conditions (redox agents, carrier and ligand concentration, pH, coexisting metals, etc.). The extension of these transport reactions to a water-in-oil-in-water type emulsion system as well as to a photcassisted transport system was studied.

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Flüssigmembran‐Technik – Übersicht über Phänomene, Transportmechanismen und Modellbildungen

Cited by 60 publications

References 62 publications

Immobilization of enzymes in liquid membranes for enantioselective hydrolysis

Immobilization of enzymes in liquid membranes for enantioselective hydrolysis

Batch extraction with liquid surfactant membranes: A diffusion controlled model

Transport of Iron and Cobalt Complex Ions through Liquid Membrane Mediated by Methyltrioctylammonium Ion with the Aid of Redox Reaction

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