CAJ | 학술논문

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箅方程,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.
통과첨가정충적간헐냉각결정실험연구료액재을순중적결정동역학.유액정체적립수밀도수거,통과구량변환법안립도무관생장모형구해립수형폐방정,채용다원선성최소이승법회귀동역학수거,득도액재을순중정체생장급성핵속솔방정.대동역학방정적이론분석표명:교반속솔대이차성핵영향현저,수교반속솔증가,정체적성핵속솔명현증가.동시괄의적과포화도급교저적현부밀도,유리우액정체생장.해연구위액냉각결정특성적변식、립도분포적공제급공업방대제공료중요적이론지도.
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.