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Title: Phase equilibria of d-glucose and sucrose in mixed solvents mixtures: comparison of UNIQUAC-based models
Authors: Peres, António M.
Macedo, Eugénia A.
Keywords: Sugar solution equilibria
Solid-liquid equilibria
Ternary solubility
Issue Date: 1997
Publisher: Elsevier
Citation: Peres, António M.; Macedo, Eugénia A. (1997) - Phase equilibria of d-glucose and sucrose in mixed solvents mixtures: comparison of UNIQUAC-based models. Carbohydrate Research. ISSN 0008-6215. 303:2, p. 135-151
Abstract: Solid-liquid equilibrium measurements of ternary sucrose-mixed solvent mixtures at 25, 40, and 60 °C are carried out, using a simple and accurate analytical method. A search for a reliable activity coefficient model for sugar liquid mixtures is performed: three UNIQUAC based models are investigated - modified UNIQUAC, entropic free-volume and original Flory-Huggins. New UNIQUAC interaction parameters are estimated based on the aqueous and non-aqueous experimental data presented in this work together with those available in the literature. The solubility calculations were carried out using an equation based on fusion enthalpy data for the sugars. Although the UNIQUAC-based models investigated give in general a quite satisfactory representation of different thermodynamic properties of aqueous solutions containing D-glucose, D-fructose, and/or sucrose, it is shown that only the modified UNIQUAC model is able to accurately describe the ternary solubility data of D-glucose and sucrose in mixed solvent mixtures.
Peer review: yes
ISSN: 0008-6215
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Appears in Collections:PTV - Artigos em Revistas Indexados ao ISI/Scopus

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