Abstract
The unclear interaction between microwaves and reaction systems limits the further application of microwave in biomass fractionation. This article explored the main factors and their influencing mechanisms that affect biomass fractionation system’s dielectric properties at the frequency of 915 MHz. The experimental results shown that as the temperature of the system increases from 30 to 140 °C, its dielectric constant varies between 23 and 36, while the dielectric loss ranges from 10.5 to 17. The dielectric properties of the system can be influenced by its moisture content, biomass particle content, and ion concentration, except for the intermediate products formed during the biomass fractionation process. Based on the experimental data, empirical expressions for the dielectric constant and dielectric loss factors of biomass fractionation systems as a function of temperature was constructed with the correlation coefficients of 0.9779 and 0.9902, respectively. This study introduces a novel approach to explore the changes in dielectric properties of non-equilibrium systems. The findings of this study are highly significant for the design and optimization of microwave heating processes.
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