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采用填充柱反相气相色谱 ,基于 Hadj- Romdhane和 Danner所提出的扩散分子在色谱柱中扩散模型 ,分别测定了不同温度下痕量的三种氯代甲烷溶剂 :二氯甲烷、三氯甲烷和四氯甲烷在聚异丁烯膜 ( PIB)中的扩散系数。实验结果表明溶剂分子在聚异丁烯中的扩散系数与体系温度和溶剂的分子大小有关。在相同温度下 ,溶剂分子睦菠 ,扩散系数越大 ;温度越高 ,扩散系数越大。同时对所测数据用 Vrentas- Duda自由体积扩散系数方程进行了探讨 ,发现对于 PIB/ CCl4 体系 ,采用预测型 Vrentas- Duda方程计算所得不同温度下的值与实验数据相符 ,而对于PIB/ CHCl3体系计算偏差较大 ,该偏差产生于预测方程中忽略了能量效应。
Based on the diffusion model of diffusion molecules proposed by Hadj-Romdhane and Danner, a reversed-phase gas chromatography with packed column was used to measure trace amounts of three kinds of methyl chloride solvents at different temperatures: dichloromethane, trichloromethane and Diffusion coefficient of tetrachloromethane in polyisobutylene film (PIB). The experimental results show that the diffusion coefficient of solvent molecules in polyisobutylene is related to the temperature of the system and the molecular size of the solvent. At the same temperature, the solvent molecules Mu spinach, the greater the diffusion coefficient; the higher the temperature, the greater the diffusion coefficient. At the same time, the measured data were discussed by Vrentas-Duda free-volume diffusion coefficient equation. It was found that for the PIB / CCl4 system, the predicted Vrentas-Duda equation was consistent with the experimental data at different temperatures and for the PIB / CHCl3 system The calculation deviation is large, and the deviation is generated in the prediction equation and ignores the energy effect.