A UNIFAC model for phase equilibrium calculations in aqueous and nonaqueous sugar solutions

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dc.contributor.author Spiliotis, N en
dc.contributor.author Tassios, D en
dc.date.accessioned 2014-03-01T01:15:27Z
dc.date.available 2014-03-01T01:15:27Z
dc.date.issued 2000 en
dc.identifier.issn 0378-3812 en
dc.identifier.uri http://hdl.handle.net/123456789/13512
dc.subject model en
dc.subject solid/liquid equilibria en
dc.subject liquid/liquid equilibria en
dc.subject vapor/liquid equilibria en
dc.subject carbohydrate en
dc.subject aqueous solution en
dc.subject nonaqueous solution en
dc.subject.classification Thermodynamics en
dc.subject.classification Chemistry, Physical en
dc.subject.classification Engineering, Chemical en
dc.subject.other VAPOR-LIQUID-EQUILIBRIA en
dc.subject.other UNIQUAC MODEL en
dc.subject.other D-GLUCOSE en
dc.subject.other FRUCTOSE en
dc.subject.other WATER en
dc.subject.other PREDICTION en
dc.subject.other SUCROSE en
dc.subject.other SYSTEMS en
dc.title A UNIFAC model for phase equilibrium calculations in aqueous and nonaqueous sugar solutions en
heal.type journalArticle en
heal.identifier.primary 10.1016/S0378-3812(00)00387-3 en
heal.identifier.secondary http://dx.doi.org/10.1016/S0378-3812(00)00387-3 en
heal.language English en
heal.publicationDate 2000 en
heal.abstract A UNIFAC type model is proposed to describe and predict phase equilibria in aqueous and nonaqueous sugar solutions. One new main UNIFAC group, CHOHsugar, has been introduced to describe all monosaccharides. This main group contains three different subgroups, CH2OH, CHOHaxial and CHOHequatorial, which are introduced based on considerations of the actual saccharide ring forms in solution. UNIFAC interaction parameters between the new group and the CH2; OH; H2O; CH2-O groups have been estimated from the solubility data of monosaccharides in water, alcohol and their binary solvent mixtures. Another UNIFAC main group, CH-O-CH, has been introduced to describe the disaccharide osidic bond. Interaction parameters between the new group and the CH2; OH; H2O; CH2-O; CHOHsugar groups have been estimated too. The model gives very satisfactory correlation and prediction of solute activity properties (i.e. solubility and i-butanol/water partition coefficients of sugars are determined by the activity of the solute) as well as satisfactory prediction of solvent activity properties (i.e. bubble and freezing points are: determined by the activity of the solvent). A comparison with the UNIFAC model developed recently by Peres and Macedo [Fluid Phase Equil. 139 (1997) 47-74], which is the only other predictive model applicable to nonaqueous sugar solutions, suggests that both models provide similar results for aqueous sugar solutions, but the proposed model is more suitable for the prediction of phase equilibrium of sugar solutions involving also nonaqueous solvents as well as in such two-phase systems. (C) 2000 Elsevier Science B.V. All rights reserved. en
heal.publisher ELSEVIER SCIENCE BV en
heal.journalName FLUID PHASE EQUILIBRIA en
dc.identifier.doi 10.1016/S0378-3812(00)00387-3 en
dc.identifier.isi ISI:000089635400003 en
dc.identifier.volume 173 en
dc.identifier.issue 1 en
dc.identifier.spage 39 en
dc.identifier.epage 55 en

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