关键词: 葡萄糖, 液相扩散系数, 关联

Abstract: Liquid diffusion coefficients are very important basic data for reasearch and many applications in chemical engineering.Because of the complex structure of liquids and the complexity of diffusion process, the research is far from maturity, there has not been a rigorous theoretical equation for the prediction of liquid diffusion coefficients.It is necessary to obtain data by experimental method and theoretical model. A metallic diaphragm cell was prepared and demarcated by measuring the diffusion coefficient of aqueous solutions of KCl at 25 ℃. The reliability of the experimental method was verified by determining the system of sucrosewater at 25 ℃ with the known diffusion coefficient.The diffusion coefficients of aqueous glucose solutions from 298.15 K to 328.15 K were determined by this metallic diaphragm cell.Based on the integral diffusion coefficients, the relationship between differential diffusion coefficients and concentration were correlated.The influence of temperature on diffusion coefficient was also discussed. Based on all these data, a semi-empirical model containing temperature for correlating the diffusion coefficients was proposed. The fitting result of this model was satisfactory.

Key words: 葡萄糖, 液相扩散系数, 关联