Study On The Equivalent Complex Permittivity Of Liquid Phase Chemical Reactions

Microwave thermal effects have been observed in a lot of experiments. These effects are related with the complex permittivity of the medium. However, the complex permittivity varies with temperature. Thus, we should consider this variation when we study the interaction between microwave and the medium.Chemical reactions are non-equilibrium systems. The key problem is how to get the equivalent complex permittivity of chemical reactions when we study the interaction between microwave and chemical reactions. Experiments show that the equivalent complex permittivity change with time nonlinearly. Up to now, there is no good theory to calculate the equivalent complex permittivity of chemical reactions exposed to microwave irradiation, though there are many traditional theories based on the equilibrium state, such as the Clausius-Mossoti equation, the Onsager equation, the statistical-mechanical theory, the Debye equation, and so on. Therefore, those theories need to be modified when used in the practical microwave chemical reaction.In order to solve these problems, we designed some experiments to measure the equivalent complex permittivity of the chemical reaction system changed with time. In these experiments, the chemical reaction system was homogeneous while it was stirred all the time or stayed after stirring well. Moreover, the temperature of the reaction system was controlled as a constant.However, it is a difficulty to measure the equivalent complex permittivity of the chemical reaction system at all temperatures while the temperature is changing withtime. In this thesis, we measured it at three different temperatures at first. Then, we used the interpolation formula, which was based on the chemical reaction, to get the equivalent complex permittivity at unmeasured temperature within a certain range. Thus, we can get the equivalent complex permittivity at any reaction time. The calculated results agree with the experimental values well. So, it becomes possible to know the rules of transmission and absorbability about the electromagnetic field in the chemical reaction system quantitatively.