计算化学反应中等效介电系数经验公式的改进

为了在化学领域中更好地应用微波能，需要深入研究微波与化学反应相互作用的机理.由于等效介电系数常常被用来描述在化学反应中微波的吸收和传输情况，因而，化学反应中反应物的等效介电系数就成为微波化学研究的关键问题之一.基于反应溶液中单位体积内的分子个数随温度变化的情况对黄卡玛提出的经验公式进行了改进.以碘化钾和高锰酸钾两个氧化还原反应为例，对实验结果和计算结果进行了分析比较，结果表明其具有很好的一致性，而且计算精度较改进前的公式得到了改善.

Improved formula to calculate effective permittivity of chemical reaction

The interaction between microwave and chemical reaction needs to be further studied for better application of microwaves to chemistry.The effective permittivity can be used to describe the molecular polarization of the mixture in the reaction and consequently be used to calculate the transmission and absorption of microwave in the reaction mixture.An improved formula based on Huang’s empirical formula was proposed to calculate the effective permittivity of chemical reaction at any temperature and reaction time by means of the temperature dependent number of molecules per unit volume of reaction solution.The calculated results of effective permittivity of two different redox reactions were in good agreement with the measured results and better than that of the original formula.