Effect of Temperature and Relative Humidity on Absorption Characteristics and Kinetic Models of Different Absorbent
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Abstract:
The static adsorption method was employed to investigate the moisture absorption characteristics of seven different moisture absorbents, including calcium chloride (CaCl2), sodium hexametaphosphate, sorbitol, konjac glucomannan (KGM), chitosan, activated aluminum oxide powder, and bentonite, which were exposed to different temperatures (2 ℃, 10 ℃, and 18 ℃) and relative humidities (RHs) (76%, 86%, and 96%) for 15 days. The results showed that moisture absorption for the same absorbent increased with increasing RH at a fixed temperature, while moisture absorption varied for different absorbents with elevated temperature at a fixed RH. The Weibull model was used to fit the experimental moisture content data; the model parameters of M∞ and β were obtained, and the relationship between M∞ and temperature/humidity was established using linear regression analysis. Except for sorbitol, the accuracy of fit of the moisture content data to the Weibull model was high. The moisture absorbents with high holding capacities (M∞) were CaCl2 (1.117~2.137 g H2O/g), sodium hexametaphosphate (0.297~0.856 g H2O/g), and sorbitol (0.083~38.567 g H2O/g), with β ranges of 25.5~119.8 h, 91.2~290.0 h, and 1.1~185.6 h, respectively. The M∞ values of chitosan and bentonite were found to be dependent on temperature and RH, while those of sodium hexametaphosphate and sorbitol were only affected by RH. These results will provide a theoretical basis for RH control during modified atmosphere (MA) storage of Agaricus bisporus.
