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1Determination of metastable zone and induction time of analgin for cooling crystallization显示文摘The solubility, metastable zone width, and induction time of analgin for unseeded batch cooling crystallization in ethanol–aqueous system were experimentally determined. The solubility data could be well described by the van't Hoff equation model. The metastable zone width at various cooling rates was measured, and some parameters of nucleation kinetic were calculated using the Ny'vlt theory. Furthermore, the induction period of various temperatures and supersaturation ratios was also measured. According to classical nucleation theory, some nucleation parameters and interfacial energy was calculated through the induction time(t_(ind)) data. Homogeneous nucleation tended to occur when the supersaturation is high, whereas heterogeneous nucleation was more likely to occur when the supersaturation is low.Ling Zhou Zhao Wang Meijing Zhang Mingxia Guo Shijie Xu Qiuxiang Yin 2017Chinese Journal of Chemical Engineering2017,25,3:7
2过程分析技术在结晶过程中的应用研究进展显示文摘结晶是一种传统的分离与纯化技术,目前在高纯度化合物的分离纯化过程中发挥着至关重要的作用,广泛应用于化工、制药等领域。基于质量源于设计理念的过程分析技术为结晶过程的监测、反馈及其控制提供了高效且可靠的支持。该文对衰减全反射傅里叶变换红外光谱技术、拉曼光谱技术、近红外光谱技术、聚光束反射测量技术等多种过程分析技术在结晶过程中的应用进行综述,系统总结上述技术的现状、优缺点,并对未来发展趋势进行展望,以期为结晶工艺的在线监控提供有效参考。吴思俊 龙之祥 彭祖仁 仇萍 李正 李文龙 2020分析测试学报2020,39,10:3
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