苊冷却结晶动力学的间歇动态法研究  

Cooling crystallization kinetics of acenaphthene by using a batch dynamic method

作　　者：党乐平[1] 王占忠[2] 刘朋标[1] 卫宏远[1] 

机构地区：[1]天津大学化工学院,天津300072 [2]天津大学农业与生物工程学院,天津300072

出　　处：《化学工程》2010年第4期17-20,共4页Chemical Engineering(China)

摘　　要：通过添加晶种的间歇冷却结晶实验研究了苊在乙醇中的结晶动力学。由苊晶体的粒数密度数据,通过矩量变换法按粒度无关生长模型求解粒数衡算方程,采用多元线性最小二乘法回归动力学数据,得到苊在乙醇中晶体生长及成核速率方程。对动力学方程的理论分析表明:搅拌速率对二次成核影响显著,随搅拌速率增加,晶体的成核速率明显增加。同时适宜的过饱和度及较低的悬浮密度,有利于苊晶体生长。该研究为苊冷却结晶特性的辨识、粒度分布的控制及工业放大提供了重要的理论指导。The crystallization kinetics of acenaphthene in ethanol was investigated by a batch cooling crystallization experiment of adding crystal seeds. From the population density data of acenaphthene crystals and based on the particle size independent growth model, the population balance equation was solved by using the moment transformation method. Using multi-linear least square method to regress kinetic data, the mathematical models for crystal growth and secondary nucleation rate of acenaphthene in ethanol were established. By analyzing kinetic equations, the results show that the secondary nucleation rate is obviously influenced by stirring rate. The nucleation rate increases quickly with increasing stirring rate. In addition, appropriate supersaturation and lower magma density are favorable to crystals growth. The research can provide important theoretical instruction for acenaphthene in identification of cooling crystallization characteristic, control of crystal size distribution and scale- up of industry.

关 键 词：苊 间歇动态法 冷却结晶动力学 生长速率 成核速率 

分 类 号：O781[理学—晶体学]