葡萄糖水溶液扩散系数的测定与关联  

Measurement and correlation on diffusion coefficients of aqueous glucose solutions

作　　者：赵长伟[1] 马沛生[1] 朱春英[1] 陈明鸣[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《化工学报》2005年第1期1-5,共5页CIESC Journal

摘　　要：液相扩散系数在化工数据中起着非常重要的作用 ,由于液体结构及扩散本身的复杂性 ,至今还没有一个合理的理论模型来预测液相扩散系数 ,有必要从实验和理论上对不同的体系进行研究 .制备了金属膜池 ,用氯化钾溶液标定了膜池常数 ,并用已有可靠文献值的蔗糖水溶液验证了装置的可靠性 .测定了 2 98 15～ 32 8 15K不同温度下葡萄糖水溶液的积分扩散系数 ,考察了温度对扩散系数的影响 .在实验数据的基础上 ,提出一个有温度关联项的半经验模型 ,关联和计算了本实验的数据 ,结果与实验值吻合很好 .Liquid diffusion coefficients are very important basic data for research 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°C. The reliability of the experimental method was verified by determining the system of sucrose-water at 25°C 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.

关 键 词：葡萄糖 液相扩散系数 关联 

分 类 号：TQ021.4[化学工程]