邻二甲苯在醋酸中扩散系数的测定

Measurement on Diffusion Coefficients of o-Xylene and Acetic Acid Solutions

利用金属膜池并用氯化钾水溶液标定了膜池常数。用已有可靠文献值的乙酸水溶液验证了装置的可靠性。测定了298．15～323．15K不同温度下邻二甲苯在醋酸中的积分扩散系数，还分别给出了微分扩散系数与邻二甲苯浓度的关联式。结果表明在相同温度下邻二甲苯在醋酸中的扩散系数随着邻二甲苯浓度的增加而减小，在同一浓度下随着温度的升高而增加。

A metallic diaphragm cell was prepared and its coefficient of aqueous KCI solutions in it at 25℃. The reliability acetic acid -water at 25 ℃ with the known diffusion coefficient. cell constant was determined by measuring the diffusion of the device was verified by determining the system of The diffusion coefficients of o-xylene in acetic acid from 298.15 K to 323.15 K were determined by this metallic diaphragm cell. Based on the integral diffusion coefficients, the relationship between differential diffusion coefficients and concentration of o-xylene were correlated. Results showed that diffusion coefficients decreased with the concentration of o-xylene increased at the same temperature and increase with the temperature increased at the same concentration.