Evaluation of sugar sorption isotherm measurement by frontal analysis under industrial processing conditions

Vente, Johan A. and Bosch, Hans and Haan de, André B. and Bussmann, Paul J.T. (2005) Evaluation of sugar sorption isotherm measurement by frontal analysis under industrial processing conditions. Journal of Chromatography A, 1066 (1-2). pp. 71-79. ISSN 0021-9673

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Abstract:	This paper evaluates frontal analysis for routine sugar isotherm measurements at industrial conditions, that is concentrations up to 400 kg/m3 and a temperature of 60 °C. Sugar isotherms for a gel type cation-exchange resin loaded with metal ions were measured in a HPLC set-up equipped with a UV detector. It is shown experimentally that isotherms obtained with large concentration steps (step series method) underestimated the isotherm. The underestimation is larger for larger resin particle size. In contrast, isotherms obtained with small concentration steps (staircase method) yielded correct isotherms. The seldom-mentioned change of the sorbent volume during the course of an isotherm measurement is discussed. It is shown that shrinking of 4% cross-linked resin at high sugar concentration has a negligible effect on the isotherm. Furthermore, the isotherms obtained with staircase frontal analysis agreed very well with those obtained with the independent, though more laborious and time-consuming, adsorption–desorption method. Staircase frontal analysis is shown to be convenient and accurate and is therefore recommended for isotherm measurements covering large concentration ranges.
Item Type:	Article
Copyright:	© 2005 Elsevier
Faculty:	Science and Technology (TNW)
Link to this item:	http://purl.utwente.nl/publications/76927
Official URL:	http://dx.doi.org/10.1016/j.chroma.2004.12.071
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