Three different examples of enzymatic bioconversion in liquid membrane reactors

Scheper, Thomas; Likidis, Z.; Makryaleas, K.; Nowottny, Ch.; Schügerl, K.

doi:10.1016/0141-0229(87)90117-7

Cited by 58 publications

(10 citation statements)

References 23 publications

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“…Assuming that the rate-controlling mass transfer step is the transport of lysine cation or its complex LYSA but not that of the carrier HA, the interphase transfer is described by the following equations: (9) and the change of L-lysine concentration in the membrane liquid is presented by (10) Since there are no local accumulations at interfaces dt F/S and SIR, the following equations are also valid: The experimental studies were carried out applying a simple bulk liquid membrane technique: a twocompartment cell equipped with a water jacket, shown in Figure 2, was used. All three liquids were stirred simultaneously at 15, 30, and 60 rpm.…”

Section: Mechanism Of L-lysine Transport Across the Liquidmentioning

confidence: 99%

Recovery of L‐lysine from dilute water solutions by liquid pertraction

Boyadzhiev

Atanassova

1991

Biotech & Bioengineering

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Kinetics of liquid membrane (Pertraction) recovery of L-lysine from dilute aqueous solutions is studied in a tow-compartment glass cell. A 5% (vol) solution of the cation exchange carrier di(2-ethylhexyl)phosphoric acid in n-decane was used as intermediate, membrane liquid. The third stripping phase was 1/v hydrochloric acid. The reaction mechanism and stoichiometry were defined, and on the basis of the proposed mathematical model of the process and the experimental data obtained, the mass transfer coefficients were evaluated. It was found that overall transfer rate is controlled by the eddy diffusion of transported species in the donor and membrane liquids. The results proved the feasibility of the pertraction process for recovery and concentration of L-lysine from its dilute aqueous solutions.

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Section: Mechanism Of L-lysine Transport Across the Liquidmentioning

confidence: 99%

Recovery of L‐lysine from dilute water solutions by liquid pertraction

Boyadzhiev

Atanassova

1991

Biotech & Bioengineering

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“…Nevertheless, these techniques are difficult to scale-up, which limits the levels of amino acid production. Liquid membrane processes including emulsion liquid membrane [4][5][6] and supported liquid membrane [7][8][9][10][11] have * Corresponding author. Tel.…”

Section: Introductionmentioning

confidence: 99%

Kinetic analysis on reactive extraction of aspartic acid from water in hollow fiber membrane modules

Lin

Chen

Juang

2006

Journal of Membrane Science

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“…20 Few investigations have been carried out to examine the effects of multicomponent mixtures on active transport. 16,19,21 In this work, the extraction of L-valine by a supported liquid membrane from synthetic medium and fermentation broth is studied. A countertransport of the amino acid by a quaternary ammonium as the carrier and chloride as the counterion is assumed.…”

Section: Introductionmentioning

confidence: 99%

Separation of L‐valine from fermentation broths using a supported liquid membrane

Deblay

Minier

Renon

1990

Biotech & Bioengineering

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A carrier-mediated counter transport process is proposed to separate and to purify an amino acid produced by microbial fermentation. The case of L-valine permeation through a liquid membrane, constituted by a solution of Aliquat 336 in decanol and supported by a hydrophobic microporous membrane, is reported. A mathematical model was developed to estimate distribution coefficients and permeabilities and to predict the influence of hydrodynamic and pH conditions on supported liquid membrane (SLM) performances. Optimum conditions for the transport and the concentration of valine were achieved with synthetic aqueous valine solutions. Series of experiments on fermentation broths, where molasses and biomass contents were varied, permitted pointing out the role of the broth composition on the kinetics and yields of separation. The selectivity of transport of valine by an Aliquat 336/decanol liquid membrane was about 10 toward molasses dyes, 100 toward glucose, and beyond 1000 toward sucrose. This allowed us to achieve the recovery and one step of purification of the product in a single operation. The stability of the Aliquat 336/decanol liquid membrane was sufficient to ensure a selective transport of valine during a continuous run lasting 18 days.

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Three different examples of enzymatic bioconversion in liquid membrane reactors

Cited by 58 publications

References 23 publications

Recovery of L‐lysine from dilute water solutions by liquid pertraction

Recovery of L‐lysine from dilute water solutions by liquid pertraction

Kinetic analysis on reactive extraction of aspartic acid from water in hollow fiber membrane modules

Separation of L‐valine from fermentation broths using a supported liquid membrane

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