SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 64 ›› Issue (12): 9-17.DOI: 10.1016/j.cjche.2023.06.004

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Experiments and model development of p-nitrochlorobenzene and naphthalene purification in a continuous tower melting crystallizer

Wenlong Xiao1, Yonglin Li3, Zhengming Yi1, Sheng Yang2, He'an Luo1   

  1. 1. School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China;
    2. School of Energy Science and Engineering, Central South University, Changsha 410083, China;
    3. College of Materials and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411105, China
  • Received:2023-02-11 Revised:2023-05-27 Online:2024-02-05 Published:2023-12-28
  • Contact: Zhengming Yi,E-mail:yizm@xtu.edu.cn;Sheng Yang,E-mail:ceshyang@csu.edu.cn
  • Supported by:
    The authors gratefully acknowledge the financial support by China Hunan Provincial Education Department Innovation Platform Project (20k125), Postgraduate Scientific Research Innovation Project of Hunan Province (CX20210518), and Postgraduate Scientific Research Innovation Project of Xiangtan University (XDCX2021B169).

Experiments and model development of p-nitrochlorobenzene and naphthalene purification in a continuous tower melting crystallizer

Wenlong Xiao1, Yonglin Li3, Zhengming Yi1, Sheng Yang2, He'an Luo1   

  1. 1. School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China;
    2. School of Energy Science and Engineering, Central South University, Changsha 410083, China;
    3. College of Materials and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411105, China
  • 通讯作者: Zhengming Yi,E-mail:yizm@xtu.edu.cn;Sheng Yang,E-mail:ceshyang@csu.edu.cn
  • 基金资助:
    The authors gratefully acknowledge the financial support by China Hunan Provincial Education Department Innovation Platform Project (20k125), Postgraduate Scientific Research Innovation Project of Hunan Province (CX20210518), and Postgraduate Scientific Research Innovation Project of Xiangtan University (XDCX2021B169).

Abstract: With the increasing demand for high-purity products, the industrial application of melt crystallization technology has been highly concerned. In this study, the purification process of nitrochlorobenzene binary eutectic system (NBES) and naphthalene–benzothiophene solid solution system (NBSSS) in tower melting crystallizer is analyzed, and a mathematical model of crystallization process is established. The key parameters in terms of feed concentration, crystal bed height, reflux ratio and stirring speed efficiency on purification effects were discussed by the established model. The results show that the concentration of p-nitrochlorobenzene was purified from 90.85% to 99.99%, when the crystal bed height is 600 mm, the reflux ratio is 2.5, and the stirring speed is 12 r·min-1. The naphthalene concentration is purified from 95.89% to 99.99%, when the crystal bed height is 400 mm, the reflux ratio is 1.43, and the stirring speed is 16 r·min-1. The quality of the model is evaluated by the ARD (average relative deviation). The minimum ARD values of the NBES and NBSSS are 2.39% and 5.22%, respectively, indicating the model satisfactorily explains the purification process.

Key words: Crystallization, Separation, Mathematical modeling, Crystallizer, Purification

摘要: With the increasing demand for high-purity products, the industrial application of melt crystallization technology has been highly concerned. In this study, the purification process of nitrochlorobenzene binary eutectic system (NBES) and naphthalene–benzothiophene solid solution system (NBSSS) in tower melting crystallizer is analyzed, and a mathematical model of crystallization process is established. The key parameters in terms of feed concentration, crystal bed height, reflux ratio and stirring speed efficiency on purification effects were discussed by the established model. The results show that the concentration of p-nitrochlorobenzene was purified from 90.85% to 99.99%, when the crystal bed height is 600 mm, the reflux ratio is 2.5, and the stirring speed is 12 r·min-1. The naphthalene concentration is purified from 95.89% to 99.99%, when the crystal bed height is 400 mm, the reflux ratio is 1.43, and the stirring speed is 16 r·min-1. The quality of the model is evaluated by the ARD (average relative deviation). The minimum ARD values of the NBES and NBSSS are 2.39% and 5.22%, respectively, indicating the model satisfactorily explains the purification process.

关键词: Crystallization, Separation, Mathematical modeling, Crystallizer, Purification