Drying of guaco leaves: experimental and modeling kinetic, equilibrium isotherms and heat of desorption

Autor: Gracielle Johann, Fernando Palú, Edson Antonio da Silva, Marina Roberto Martins
Rok vydání: 2021
Předmět:
Zdroj: Journal of Thermal Analysis and Calorimetry. 147:7411-7420
ISSN: 1588-2926
1388-6150
Popis: Due to the huge variety of therapeutic properties found in plant leaves, many of these are widely used in traditional medicine. Among these plants, guaco, which has a rich in chlorogenic acids composition, is considered exotic in Brazil, being, therefore, an environmental problem. In this context, this study obtained the drying kinetics and the experimental equilibrium isotherms of guaco leaves, in the 40 to 70 °C range. Oswin's empirical model described 96% of the equilibrium data. The phenomenological mathematical model of distributed parameters, solved with the employment of thermo-physical properties, obtained from the centesimal composition, described 99% of the thin layer drying kinetics of guaco leaves. The heat of desorption, obtained by the Othmer method, ranged from 2375 to 3858 kJ kg−1, for the moisture in the range of 0.05 and 0.35 (d.b.). With the obtained results, it is possible to estimate both the drying time and the amount of energy needed to reach the final moisture which is safe for the storage of guaco leaves.
Databáze: OpenAIRE
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