Determination of Lactose and Ethanol Diffusion Coefficients in Calcium Alginate Gel Spheres: Predicting Values To Be Used in Immobilized Bioreactors

Autor:	Sabrina Gabardo, Rosane Rech, Marco Antônio Záchia Ayub
Rok vydání:	2011
Předmět:	chemistry.chemical_compound Ethanol Calcium alginate Chromatography chemistry General Chemical Engineering Diffusion Bioreactor SPHERES General Chemistry Lactose
Zdroj:	Journal of Chemical & Engineering Data. 56:2305-2309
ISSN:	1520-5134 0021-9568
DOI:	10.1021/je101288g
Popis:	The diffusion coefficients (D) for lactose and ethanol through calcium alginate gel beads were determined based on the mathematical approach of Fick's second law. Different experimental conditions were tested to evaluate the behavior of the diffusion coefficient of different concentrations of lactose and ethanol in Ca-alginate (3, 4, and 6) % at varying temperatures (298.15, 303.15, and 308.15) K. Results showed that diffusion coefficients were independent from the concentration of lactose and ethanol, as well as from the concentration of Ca-alginate. Diffusion coefficients were affected by temperature, increasing from 4.67·10–10 m2·s–1 to 6.96·10–10 m2·s–1 for lactose and from 1.46·10–10 m2·s–1 to 2.68·10–10 m2·s–1 for ethanol. These results can be used for the project and scaling up of immobilized bioreactors for the conversion of lactose into ethanol.
Databáze:	OpenAIRE
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