Face-Specific Growth and Dissolution Kinetics of Potassium Dihydrogen Phosphate Crystals from Batch Crystallization Experiments
Face-Specific Growth and Dissolution Kinetics of Potassium Dihydrogen Phosphate Crystals from Batch Crystallization Experiments
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DOI：
10.1021/cg501251e
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发表时间：
2015-01-01
影响因子：
3.8
通讯作者：
Sundmacher, K.
中科院分区：
文献类型：
--
作者：
Eisenschmidt, H.;Voigt, A.;Sundmacher, K.
晶体材料的最终形状分布是重要的产品质量，其由生长控制，也可能由单个晶面的溶解速率控制。间歇工艺条件下的动力学知识允许关于所需形状分布的最佳工艺设计。在这项工作中，磷酸二氢钾（KDP）被选为一个模型物质，其面特定的增长和溶解速率测定在一个间歇结晶器。用C。Borchert等人（Image-Based in Situ Identification of Face Specific Crystal Growth Rates from Crystal Populations.晶体生长描述2014，14，952-971）。分别考察了浓度和温度对动力学的影响。结果发现，晶体生长的强烈影响，在低过饱和度的杂质，而杂质的影响在较高的过饱和度减少。发现溶出速率线性依赖于所施加的欠饱和度，并且没有可见的杂质影响。温度对KDP的生长和溶解动力学的影响符合Arrhenius定律，并确定了相应的生长和溶解活化能。
The final shape distribution of crystalline materials is an important product quality that is controlled by the growth and possibly also by the dissolution rates of individual crystal facets. Knowledge of the kinetics under batch process conditions allows optimal process design with regard to desired shape distributions. In this work, potassium dihydrogen phosphate (KDP) was chosen as a model substance, for which face-specific growth and dissolution rates were determined in a batch crystallizer. The temporal evolution of the crystal population was tracked with a flow-through microscope using a shape estimation procedure presented by C. Borchert et al. (Image-Based in Situ Identification of Face Specific Crystal Growth Rates from Crystal Populations. Cryst. Growth Des. 2014, 14, 952-971). Effects of concentration and temperature on the kinetics were separately investigated. It was found that crystal growth is strongly affected by impurities at low supersaturation, whereas impurity effects are diminishing at higher supersaturation. The dissolution rates were found to be linearly dependent on the applied undersaturation, and no impurity effects were visible. The effects of temperature on both growth and dissolution kinetics were found to obey the Arrhenius law, and corresponding activation energies for growth and dissolution of KDP were determined.