Modeling of equilibrium sorption of water vapor on starch materials
1992
Westgate, P. | Lee, J.Y. | Ladisch, M.R.
The equilibrium behavior of corn grits and corn starch at temperatures above 70 degrees C, a region for which limited data and theory are available, are compared and found to be similar. Sircar's model and potential theory accurately represent isotherm data for both adsorption systems as well as data for desorption from corn. Values of the model parameters indicate that physical properties of these starch-based sorption materials exhibit a temperature dependence that is likely related to the breaking of hydrogen bonds as water interacts with the sorbent. Modification of the two models with an exponential temperature relation is proposed to account for the experimentally measured temperature dependence of model parameters. The resulting modified Sircar's model and potential theory equations are shown to fit the data for both starch and corn grits in the high temperature range.
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