Abstract:

The excitation energy acquired by the goal molecules in microwave field was theoretically analyzed from the interaction between goal molecules and microwave field.The effective diffusion equation of the goal molecules in bulk material in microwave field was deduced on the basis of the theory of liquid lattice model, and the mechanism of goal component diffusion enhanced by microwave field was analyzed.The results indicated that the bulk material porosity increased by microwave field and non-calorific energy acquired by goal molecules were the main reasons for the goal molecules diffusion enhanced by microwave field, and the general characteristics of the extraction process enhanced by microwave field were revealed.A kinetic model of goal component diffusion in microwave field was further established by simplifying the effective diffusion equation.The fitting of experimental data showed that theoretical curves of different parameters of the same kinetic equation were in agreement with different experiment results respectively，and all fitting correlation coefficients were above 0.96.The experimental data fitted under different conditions satisfied the same kinetic law and the kinetic model established was adaptive and appropriate to some degree.

Key words:

微波强化萃取, 非热效应能, 动力学模型参数

摘要：

从目标成分与微波场之间的相互作用出发，讨论了目标分子在微波场中所获得的激发能，并在液体“格子”模型理论的基础上，推导了微波场中目标成分分子在基体内部的有效扩散速率公式，由此分析了微波强化目标成分扩散的机理，结果表明：微波增加基体材料的空隙率和使目标成分获得非热效应能是微波强化目标成分扩散的主要原因，揭示了微波强化萃取过程的共性特征。通过简化有效扩散速率公式，进一步建立了微波场中目标成分扩散的动力学模型，通过与实验结果拟合表明：同一动力学方程不同参数的理论曲线分别与不同实验结果一致，其所有的拟合相关系数均达0.96以上，说明被拟合的不同条件下的实验满足相同的动力学规律，表明所建立的动力学模型有一定的适应性和合理性。

关键词:

微波强化萃取, 非热效应能, 动力学模型参数