ISSN:
1750-3841
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
SUMMARY A survey is made of the problem of predicting and correlating phase diagrams for multicomponent aqueous sugar solutions, starting from experimental data for aqueous solutions of single sugars. An evaluation of existing observations indicates that equilibrium cooling of quaternary solutions of d-fructose, d-glucose, sucrose and water will form a succession of four distinct solid phases. In an equilibrium situation each of these solid phases would begin to appear at the temperature where the residual liquid becomes saturated in that component. Ultimately a quaternary eutectic liquid of invariant and uniquely determined composition would remain and solidify at a unique temperature. This aquilibrium behavior represents the limit for actual situations where delayed crystallization can hamper attainment of equilibrium. A method is presented for predicting solid-liquid equilibrium in multicomponent systems, notably fruit juices, through the use of ideal-solution concepts for defining the order and extent to which solid phases appear and through the use of observed activity coefficients for obtaining the relationship between temperature and wt-% dissolved solids. The method is illustrated in terms of the limiting thermodynamic equilibrium freezing behavior of fruit juices and predictions are compared with experimental data for fruit juices.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2621.1971.tb15165.x
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