【摘要】 针对膜池法的主要缺点,考察选用了金属扩散膜代替传统的玻璃膜,以缩短测定时间,使膜池法更便于应用。根据考察,所选平均透孔半径为1。42μ,厚100μ的多孔金属烧结膜可用于膜池法测定液相扩散系数。所测水-乙醇和乙醇-四氯化碳物系在25.00℃的扩散系数与文献值基本一致。所需测定时间由传统玻璃膜扩散池的2～4天减少到1.5～4小时。利用改进的膜池法测定了25.00℃的苯-四氯化碳物系在全浓度范围内和正丙醇-四氯化碳物系在部分浓度下的扩散系数。实验所测扩散系数的相对误差小于1.8％。更多还原

【Abstract】 In order to improve the traditional Sintered-glass diaphragm cell used for liquid diffusion, preliminary investigation has been made on the applicability of porous metallic membrane. It has been found that a metallic membrane with openings of average radius of 1.42μ and thickness of 100μ can be successfully used for such purpose. The diffusion coefficients determined by the metallic diaphragm cell for the water-ethanol and ethanol-carbon tetrachloride systems at 25.00℃ are in agreement with those published in literature. The time of determination has been reduced from 2～4 days as usually required for sinter-glass diaphragm cell to 1.5～4 hrs. for the present cell. Diffusion coefficients have also determined at 25.00℃ by the present cell for benzene-carbon tetrachloride and propanol-carbon tetrachloride systems with experimental error less than 1.8%更多还原