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  • Biochemistry and Biotechnology  (2)
  • activity coefficients  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Representation of cupric chloride solutions with Pitzer's model: Application to the extraction equilibrium of copper (II) by LIX 65N (1988)
    Springer
    Journal of solution chemistry 17 (1988), S. 953-965 
    Details
    ISSN: 1572-8927
    Keywords: Copper ; chloride solutions ; stability constants ; activity coefficients ; liquid-liquid extraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A model combining formation of cupric chlorocomplexes and deviations to ideality in electrolyte solutions is proposed for the representation of ther-modynamic properties of concentrated cupric chloride solutions at 25°C in the presence of other ions (Na+, Li+, Mg2+, H+ or SO 4 2− ). A set of equilibrium constants for the formation of cupric chlorocomplexes is obtained. The equation for the calculation of activity coefficients, using a modified Pitzer expression, yields not only the composition of CuCl2 solutions at various experimental conditions, but also the activities for each species. The model represents, with a mean accuracy of 1.2%, a large number of spectrophotometric, as well as osmotic data. It was applied to the extraction of Copper (II) from chloride aqueous solutions by LIX 65N in ESCAID 100 solvent. In this case, the accuracy of the representation (4%) is consistent with the estimated experimental error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649739
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  • 2
    Electronic Resource
    Electronic Resource
    Separation of L-valine from fermentation broths using a supported liquid membrane (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 35 (1990), S. 123-131 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: 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.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260350203
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  • 3
    Electronic Resource
    Electronic Resource
    Ethanol extraction by supported liquid membrane during fermentation (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 36 (1990), S. 116-123 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A supported liquid membrane system was developed for the extraction of ethanol during semicontinuous fermentation of Saccharomyces bayanus. it consisted of a porous Teflon sheet as support, soaked with isotridecanol. This assembly permitted combining biocompatibility, permeation efficiency, and stability. The removal of ethanol from the cultures led to decreased inhibition and, thus, to a gain in conversion of 452 g/L glucose versus 293 g/L glucose without extraction. At the same time, the ethanol volumetric productivity was enhanced 2.5 times, due to an improvement of yeast viability, while the substrate conversion yield was maintained above 95% of its theoretical value. Besides these improvements in fermentation performances, the process resulted in ethanol purification, since the separation was selective towards microbial cells and carbon substrate, and likely selective to mineral ions present in the fermentation broth. For pervaporation, a concentration of ethanol four times greater was obtained in the collected permeate.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260360203
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