Distribution of dye into KDP crystals in a continuous MSMPR crystallizer
Distribution of dye into KDP crystals in a continuous MSMPR crystallizer
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DOI：
10.1016/j.seppur.2004.10.006
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发表时间：
2005-04
影响因子：
8.6
通讯作者：
Hideo Miki;Ryohei Fukunaga;Y. Asakuma;K. Maeda;K. Fukui
中科院分区：
文献类型：
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作者：
Hideo Miki;Ryohei Fukunaga;Y. Asakuma;K. Maeda;K. Fukui
在混合悬浮液混合产物去除（MSMPR）结晶器中从染料（天蓝色）溶液中制备有色磷酸二氢钾（KDP）晶体。KDP晶体的晶体尺寸分布（CSD）与尺寸相关的生长速率模型。生长速率随晶体尺寸的增大而增大，但随停留时间的增加而减小。在溶液中的两种不同浓度的染料被检查用于KDP晶体的MSMPR结晶。低染料浓度溶液中的着色晶体生成规则形状的KDP晶体。规则形状的KDP晶体中的染料分配系数小于1。而高染料浓度溶液中的着色晶体则形成了不含（100）扇形的异形KDP晶体。从染料溶液到异形KDP晶体的染料分配系数大于1。给出了染料分布系数与晶体尺寸的关系，并讨论了KDP晶体形态的长径比与染料分布系数的关系。本文首次提出了MSMPR结晶器中染料杂质在KDP晶体中的分布模型。
Colored potassium dihydrogen phosphate (KDP) crystals from a dye (sky blue) solution were produced in a mixed suspension mixed product removal (MSMPR) crystallizer. The crystal size distribution (CSD) of the KDP crystals was correlated by a size-dependent growth rate model. The growth rate increased with crystal size, but it decreased as the residence time increased. Two different concentrations of dye in the solution were examined for MSMPR crystallization of KDP crystals. The colored crystals from the solution with low dye-concentration generated regular-shaped KDP crystals. The dye distribution coefficient into the regular-shaped KDP crystals was less than unity. However, the colored crystals from the solution with high dye-concentration formed the special-shaped KDP crystals having no (100) sector. The dye distribution coefficient into the special-shaped KDP crystals from the dye solution was larger than unity. The dye distribution coefficient as a function of crystal size was presented, and then the relationship between the aspect ratio of the morphology of KDP crystals and dye distribution coefficient was discussed. As a result, a distribution model of dye impurity in KDP crystals for an MSMPR crystallizer could be first proposed in this work.