Seeding policy in batch cooling crystallization
Seeding policy in batch cooling crystallization
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DOI：
10.1016/s0032-5910(01)00371-0
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发表时间：
2001-11-05
影响因子：
5.2
通讯作者：
Sato, A
中科院分区：
文献类型：
--
作者：
Kubota, N;Doki, N;Sato, A
根据控制冷却和自然冷却两种冷却方式下钾铝-水体系的原始实验数据，讨论了种子在间歇冷却结晶中的作用。无论冷却方式如何，只要在临界浓度以上有足够的种子负荷，就可以获得生长种子的单峰产物晶体尺寸分布。缓慢冷却不是避免二次成核的必要条件。在种子图的帮助下，可以很容易地从几批试验中确定临界种子浓度，在种子图中，产品晶体的平均质量大小与种子大小归一化，作为种子浓度的函数，以种子大小为参数。这种类型的播种效应可以在其他系统的冷却结晶和采用其他过饱和产生方法的结晶中观察到。(C) 2001 Elsevier Science B.V.版权所有
The effect of seeding in batch cooling crystallization is discussed on the basis of original experimental data on potassium alum-water system obtained for both controlled and natural cooling modes. Regardless of the cooling mode, unimodal product crystal size distributions of grown seeds were obtained, provided that enough seed loadings are above a critical concentration. Slow cooling was not a necessary condition to avoid secondary nucleation. The critical seed concentration can be determined easily from several batch trials with the help of a seed chart, in which mean mass size of product crystals normalized with the seed size is plotted as a function of seed concentration, with seed size as a parameter. This type of seeding effect could be observed for cooling crystallization of other systems and for crystallization employing other supersaturation-generating methods. (C) 2001 Elsevier Science B.V. All rights reserved.