Model to Simulate the Structure of a Crystal Pillar and Optimize the Separation Efficiency in Melt Crystallization by Fractal Theory and Technique
Model to Simulate the Structure of a Crystal Pillar and Optimize the Separation Efficiency in Melt Crystallization by Fractal Theory and Technique
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DOI：
10.1021/ie200810v
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发表时间：
2011-08
影响因子：
4.2
通讯作者：
Xiaobin Jiang;Baohong Hou;Jingkang Wang;Q. Yin;Meijing Zhang
中科院分区：
文献类型：
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作者：
Xiaobin Jiang;Baohong Hou;Jingkang Wang;Q. Yin;Meijing Zhang
采用分形多孔介质模型对电子级磷酸（EGPA）熔融结晶过程中形成的晶柱结构进行了模拟。对模型进行了修改，使其符合结晶过程，通过观察渗透过程和测量固液相平衡条件，可以获得晶柱的结构参数。引入具有现实意义的特征因子对模型进行修正。仿真结果与实验数据吻合较好。优化了操作曲线，获得了高分离效率的EGPA超纯产品。本文提出了一种优化操作。用所建立的模型对优化后的操作进行了模拟，仍取得了满意的结果。优化实验验证了该模型的稳定性和可靠性。该模型通过预测晶柱的有效孔隙率，可以评价分离效果，这对工业晶体产品的生产至关重要。
In this paper, an existing fractal porous media model was applied to simulate the structure of the crystal pillar formed in melt crystallization for electronic grade phosphoric acid (EGPA) preparation. The model was modified to meet the crystallization process; the structure parameter of the crystal pillar could be obtained by inspecting the seeping process and measuring the solid-liquid phase equilibrium condition. A characterized factor ϕ with realistic significance was introduced to modify the model, too. The simulation results met the experiment data well. An optimized operation curve was developed to obtain ultrapure EGPA product with higher separation efficiency. An optimized operation was proposed in this paper. Simulating the optimized operation with the model established above, we still obtained a satisfactory result. So the optimized experiment verified the stability and reliability of this model. This model can evaluate the separation effect which is vital to industrial crystal product manufacturing by anticipating the effective porosity of a crystal pillar.