Permeability analysis and seepage process study on crystal layer in melt crystallization with fractal and porous media theory

doi:10.1007/s11705-011-1139-3

Front Chem Sci Eng

2011, Vol. 5

Issue (4) : 435-441 https://doi.org/10.1007/s11705-011-1139-3

RESEARCH ARTICLE

Permeability analysis and seepage process study on crystal layer in melt crystallization with fractal and porous media theory

Xiaobin JIANG, Baohong HOU, Yongli WANG, Jingkang WANG(

)

State Research Center of Industrialization for Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

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Abstract

In this paper a porous media seepage model was applied to analyze the permeability and study the seepage process of crystal pillar formed in the preparation of electronic grade phosphoric acid (EGPA). By inspecting the seeping process, the structure parameter of crystal pillar could be obtained. Two basic ideal models (perfectly separated model and perfectly connected model) were presented and a characterized factor φ was introduced to modify the model. A good simulation result was obtained which met the experiment result well. The relationship between φ and permeability were also discussed. The characterized factor φ showed potential application on optimizing process.

Keywords melt crystallization porous media fractal permeability hyperpure material simulation

Corresponding Author(s): WANG Jingkang,Email:wangjkch@tju.edu.cn

Issue Date: 05 December 2011

Cite this article:

Xiaobin JIANG,Baohong HOU,Yongli WANG, et al. Permeability analysis and seepage process study on crystal layer in melt crystallization with fractal and porous media theory[J]. Front Chem Sci Eng, 2011, 5(4): 435-441.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-011-1139-3
https://academic.hep.com.cn/fcse/EN/Y2011/V5/I4/435

Fig.1 Crystal pillar in the crystal tower (left) and product (right)

Fig.2 balance; 2 beaker; 3 valve; 4,5,6 temperature recorders; 7 crystallizer; 8 temperature control meter; 9 circulating water bath.
Schematic diagram of experimental apparatus

Fig.3 Comparison of the HPO·0.5HO single crystals with different (a) = 85.48%; (b) = 88.86%; (c) = 89.56%

Tab.1 , , , and with different and

Fig.4 The comparison between real flow rate and model flow rate. (a) = 0.7825, = 0.9786 (test No. 10); (b) = 0.6638, = 0.8340 (test No. 8); (c) = 0.6249, = 0.7838 (test No. 6); (d) = 0.5689, = 0.7163(test No. 3); (e) = 0.3924, = 0.4909 (test No. 2); (f) = 0.2886, = 0.3669 (test No. 1). ·: experiment data; ……(small dotl): simulation result of model A;—-(dash): simulation result of model B; ——: simulation result of model with characteristic factor

Fig.5 The comparison between experiment data and fitting results

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