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KMID : 1094720210260050814
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Biotechnology and Bioprocess Engineering
2021 Volume.26 No. 5 p.814 ~ p.826
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Development of Drying Process for Removal of Residual Moisture from Biomass Pretreated with Ethanol and Its Kinetic and Thermodynamic Analysis
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Park Seo-Young
Kim Jin-Hyun
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Abstract
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In this study, a drying process with ethanol pretreatment was developed for effective removal of residual moisture from the plant cell Taxus chinensis. Drying efficiency was improved remarkably by a simple rotary evaporation with ethanol pretreatment. At the optimal amount of ethanol for pretreatment (biomass/ethanol = 3:1, w/v), the drying time was shortened by 1.9 times (40°C), 1.5 times (50°C), and 1.3 times (60°C), respectively, compared to drying without ethanol pretreatment. The experimental data was applied to the representative kinetic drying models, and the modified Page model was shown to be the most suitable. Thermodynamic parameters represented the spontaneous and endothermic characteristics of the drying process by the ethanol pretreatment, and randomness during the drying process was also increased. The highest effective diffusion coefficient (6.216 × 10?14?7.940 × 10?14 m2/s at 40?60°C), Biot number (4.40 × 10?2?6.60 × 10?2 at 40?60°C), and mass transfer coefficient (64.34 × 10?12?123.39 × 10?12 m/s at 40?60°C) were observed when the biomass was pre-treated with an optimal amount of ethanol. In addition, as the drying temperature was increased with the same ethanol amount, these values were also increased.
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KEYWORD
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biomass, drying, ethanol pretreatment, kinetics, effective diffusivity, mass transfer coefficient, thermodynamics
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