Understanding microwave heating in biomass-solvent systems
Understanding microwave heating in biomass-solvent systems
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DOI：
10.1016/j.cej.2020.124741
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发表时间：
2020-08
影响因子：
15.1
通讯作者：
A. Taqi;Etienne Farcot;J. Robinson;E. Binner
中科院分区：
文献类型：
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作者：
A. Taqi;Etienne Farcot;J. Robinson;E. Binner
提出了一种新的机理，为微波在溶剂萃取过程中的作用提供了一个可行的物理解释。关键的创新是温度诱导扩散，这是一种最近证明的现象，是由使用微波的选择性加热引起的。提出了一种机制，其中包括微波加热，细胞膨胀，传热和传质，所有这些都影响生物质内的细胞结构的压力。电池压力建模与时间在一系列的物理和工艺变量，并与现有的蒸汽破裂理论的预期输出。结果表明，蒸汽破裂是唯一可能的，在极端边缘的现实物理参数，但温度诱导扩散是能够解释细胞破裂在广泛和现实的范围内的物理参数和加热条件。温度诱导扩散是控制微波辅助萃取的主要原理，这为仅根据其物理性质选择加工条件和原料铺平了道路。
A new mechanism is proposed to provide a viable physical explanation for the action of microwaves in solvent extraction processes. The key innovation is Temperature-Induced Diffusion, a recently-demonstrated phenomenon that results from selective heating using microwaves. A mechanism is presented which incorporates microwave heating, cellular expansion, heat transfer and mass transfer, all of which affect the pressure of cell structures within biomass. The cell-pressure is modelled with time across a range of physical and process variables, and compared with the expected outputs from the existing steam-rupture theory. It is shown that steam-rupture is only possible at the extreme fringes of realistic physical parameters, but Temperature-Induced Diffusion is able to explain cell-rupture across a broad and realistic range of physical parameters and heating conditions. Temperature-Induced Diffusion is the main principle that governs microwave-assisted extraction, and this paves the way to being able to select processing conditions and feedstocks based solely on their physical properties.