Thermodynamics of ternary mixtures containing sugars. SLE of D-fructose inpure and mixed solvents. Comparison between modified UNIQUAC and modified UNIFAC

New experimental data on the solubilities of D-fructose in the mixed solven ts water/ethanol, water/methanol, and ethanol/methanol at 25, 40, and 60 de greesC are presented. These data were obtained using a standard, simple, an d accurate experimental technique. Therefore, the database generated in our laboratory throughout a 4-year project now contains 205 solubility data po ints for systems with D-glucose, sucrose, and D-fructose in pure water, eth anol, and methanol and their mixtures. All of these data were correlated us ing the modified UNIQUAC, the entropic free-volume, and the original Flory- Huggins models, and the new parameters are given. The modified UNIQUAC mode l is the more accurate for the representation of the data. At the same time , predictions obtained with two different UNIFAC methods are compared.