摘要
为定量识别溶液间歇结晶过程中的成核和生长阶段 ,基于晶粒数目和粒度的变化对粒度分布 ( CSD)的二阶和三阶矩量影响程度的不同 ,定义并关联了无因次变量 K和 K* .添加晶种 KNO3-H2 O溶液结晶过程模拟计算的结果表明 ,K和 K* 值均呈先降后升的变化趋势 ,成核时单调下降 ,生长过程中单调上升 ;且K与 K*值较接近 .测定了 KNO3-H2 O溶液自发成核结晶过程中溶液浓度和透光率的变化 ,用 K*判据定量识别出成核阶段和生长阶段 ,并与晶体线性生长速率模型检验的结果相吻合 .K值的计算依赖于 CSD和结晶动力学参数 ,而 K* 作为成核和生长阶段的模型判据 。
For improving the precision of kinetic parameter estimation and further research of the mechanism, it was very important to identify nucleation and crystal growth stages quantitatively in the batch crystallization from solution. The dimensionless variables of K and K * were described based on the difference of crystal number and its size contributing to the second and third moments of crystal size distribution(CSD), respectively. For a typical seeded crystallization of potassium nitrate in water...
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第3期504-508,391,共6页
Chemical Journal of Chinese Universities
关键词
溶液间歇结晶
成核阶段
生长阶段
定量识别
Solution batch crystallization
Nucleation stage
Crystal growth stage
Quantitative identification
