Water sorption thermodynamic properties applied to persimmon skin and pulp
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Data
2000-01-14
Autores
Telis, V. R. N. [UNESP]
Gabas, A. L.
Menegalli, F. C.
Telis-Romero, J. [UNESP]
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Resumo
Moisture equilibrium data of persimmon skin and pulp were determined using the static gravimetric method. Adsorption and desorption isotherms were obtained in the range of 20-70°C, to water activities (a w) from 0.02 to 0.85. The application of the GAB model to the experimental results, using direct nonlinear regression analysis, provided a good agreement between experimental and calculated values. The net isosteric heat of sorption was estimated from equilibrium sorption data, using the Clausius-Clapeyron equation. Isosteric heats of sorption were found to increase with increasing temperature and could be well adjusted by an exponential relationship. The enthalpy-entropy compensation theory was applied to sorption isotherms and plots of ΔH versus ΔS for skin and pulp provided the isokinetic temperatures, indicating an enthalpy controlled sorption process. © 2000 Elsevier Science B.V.
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Isotherms, Moisture content, Persimmon, Thermodynamic properties
Como citar
Thermochimica Acta, v. 343, n. 1-2, p. 49-56, 2000.