Diffusion of Saccharides and Sugar Alcohol Sorbitol in Chitosan Membranes and Beads |
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Authors: | T. Waluga S. Scholl |
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Affiliation: | Technical University Braunschweig, Institute for Chemical and Thermal Process Engineering, Braunschweig, Germany |
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Abstract: | Diffusion coefficients of different sugars and the sugar alcohol sorbitol have been determined by two different experimental setups: mass transfer through a flat membrane in a diffusion cell and effusion experiments with beads in a batch stirred vessel. Diffusion experiments show highly consistent data with low uncertainties and high regression coefficients, while effusion experiments suffer from larger experimental uncertainties. For the diffusion through a chitosan membrane at 25 °C, typically one‐third of the free molecular diffusion coefficient is found, whereas at 40 °C only one‐quarter of it is reached. The influence of molecular size, structure, and temperature on the transport properties is discussed in detail. |
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Keywords: | Chitosan Diffusion Effusion Mass transport Saccharides |
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