E3S Web Conf.
Volume 207, 202025th Scientific Conference on Power Engineering and Power Machines (PEPM’2020)
|Number of page(s)||9|
|Section||Thermal Equipment, Heat and Mass Transfer Processes|
|Published online||18 November 2020|
Thermodynamics of moisture sorption in tobacco (Nicotiana tabacum L.) seeds
1 University of Food Technologies, Department of Processes Engineering, 4002 Plovdiv, Bulgaria
2 University of Food Technologies, Department of Tobacco, Sugar, Vegetable and Essential Oils, 4002 Plovdiv, Bulgaria
* Corresponding author: firstname.lastname@example.org
In this study, the thermodynamic characteristics of tobacco seeds were investigated, based on experimental data from equilibrium moisture isotherms at desorption. An empirical exponential relationship was found for the decrease of the net isosteric heat and the differential entropy, based on the Clausius-Clapeyron equation, in response to the increase in moisture content; the values of the two parameters varied from 31.09 to 1.46 kJ.mol-1 and from 91.53 to 4.29 J.mol-1.K-1, respectively. The linear relationship between the enthalpy and the entropy in the moisture desoption of tobacco seeds supported the validity of the enthalpy-entropy theory. The value of Gibbs free energy was positive and the harmonic temperature (297.5 K) was lower than the isosteric temperature (339.6 K). The outcomes from the study provide for the deeper insight into the process of moisture desorption of tobacco seeds.
© The Authors, published by EDP Sciences, 2020
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