Thermal Analyses of Polyol-Aqueous Solutions below 0.DEG.C. by Differential Scanning Calorimetry.

Uraji, Tatsuya; Kohno, Hiroyuki; Nakashima, Kazuaki; Shimoyamada, Makoto; Watanabe, Kenji

doi:10.3136/nskkk.44.380

Cited by 2 publications

(1 citation statement)

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“…However, the predictions of freezing point depression did not present the same accuracy, with mean deviations of 10% for the UNIFAC-Larsen model and 47% for the ASOG model. The experimental data are from Uraji et al (1997), and the results achieved for sorbitol are also presented in Figure 3. The prediction of the eutetic points for xylitol and sorbitol aqueous solutions was also performed.…”

Section: Resultsmentioning

confidence: 99%

Water Activity in Polyol Systems

2000

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Water activities of binary and ternary mixtures containing polyols were measured using an electronic hygrometer with temperature ranging from (10 to 35) °C. The concentrations of the mixtures varied according to the solubility limit for each polyol (D-sorbitol, D-mannitol, xylitol, meso-erythritol, and glycerol). Results were compared with the group contribution-based models ASOG and UNIFAC. The predictions using parameters from the literature were poor, probably as a consequence of the strongly polar hydroxyl groups bounded to consecutive carbon atoms in the polyol molecule. Better agreement was obtained by readjusting some of the interaction parameters. The data bank used in this procedure included water activity data as well as polyol solubility data taken from the literature. The best results were achieved using the UNIFAC-Larsen model with an average relative deviation of 0.9% for water activity and solubility data.

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Section: Resultsmentioning

confidence: 99%