Experimental determination and modeling of equilibrium moisture content from the sapwood of Mexican pine (<Emphasis Type="Italic">Pinus pseudostrobus</Emphasis> Lindl.) |
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Authors: | Juan Rodriguez-Ramirez Sadoth Sandoval-Torres Lilia Mendez-Lagunas Artemio Carrillo Parra |
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Institution: | (1) Chemical Engineering Department, Tarbiat Modarres University, P.O. Box 15815-1633, Tehran, Iran |
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Abstract: | A desorption isotherm is a very important basis in the understanding of drying process. In this study, the desorption isotherms
from the sapwood of Mexican pine (Pinus pseudostrobus Lindl.) were determined by the gravimetric method (discontinuous control of sample weight) at 30°C and 50°C. The salt method
was used in the range of water activities from 0.11 to 0.89. The results show that the desorption ability of Mexican pine
sapwood increased with temperature at a given relative humidity. The experimental data was further simulated with the models,
i.e., BET, GAB, Oswin and Henderson models. The GAB, Oswin and Henderson models allow the representation of the entire desorption
isotherms. The BET model showed a better fit for water activity lower than 0.35, with a mean relative deviation of 0.0286
at 30°C and 0.0167 at 50°C. Simultaneously, the BET model gave a better representation of moisture content in the monolayer
saturation region. Overall, the GAB model ensured the best simulation of the entire isotherm, while the Henderson model displayed
the worst simulation. |
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Keywords: | modeling isotherms Mexican pine sapwood |
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