SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 29 ›› Issue (3): 164-168.DOI: 10.1016/j.cjche.2020.11.020

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Determination of the metastable zone and induction time of thiourea for cooling crystallization

Tong Zhou, Chunzhao Tu, Ya Sun, Linan Ji, Chuangxian Bian, Xiaohua Lu, Changsong Wang   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
  • Received:2020-08-31 Revised:2020-10-27 Online:2021-05-13 Published:2021-03-28
  • Contact: Changsong Wang
  • Supported by:
    This work was supported by Top-notch Academic Programs Project of Jiangsu Higher Education Institution (TAPP), Priority Academic Program Development of Jiangsu Higher Education Institutions (PPZY2015A044). Appreciation the support from JingboNanjing Tech University Research Institute (JBNT-2020-003).

Determination of the metastable zone and induction time of thiourea for cooling crystallization

Tong Zhou, Chunzhao Tu, Ya Sun, Linan Ji, Chuangxian Bian, Xiaohua Lu, Changsong Wang   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
  • 通讯作者: Changsong Wang
  • 基金资助:
    This work was supported by Top-notch Academic Programs Project of Jiangsu Higher Education Institution (TAPP), Priority Academic Program Development of Jiangsu Higher Education Institutions (PPZY2015A044). Appreciation the support from JingboNanjing Tech University Research Institute (JBNT-2020-003).

Abstract: The solubility, metastable zone width (MSZW), and induction time of thiourea for cooling crystallization were experimentally determined in the temperature range of 283–323 K. The solubility data could be well described by the Apelblat equation model as lnx = -99.55 + 1071.66/T + 16.27lnT. The determinations of the effects of various stirring and cooling rates indicated that the MSZW increased with increasing and decreasing cooling and stirring rates, respectively. Furthermore, the induction times at various temperatures and supersaturation ratios were also measured. The results indicated that homogeneous nucleation could occur at high supersaturation, whereas heterogeneous nucleation was more likely to occur at low supersaturation. Based on the classical nucleation theory and induction period data, the calculated solid–liquid interfacial tensions of thiourea in deionized water at 302.46 and 312.58 K were 2.86 and 2.94 mJ·m-2, respectively.

Key words: Thiourea, Metastable zone, Induction time, Cooling crystallization

摘要: The solubility, metastable zone width (MSZW), and induction time of thiourea for cooling crystallization were experimentally determined in the temperature range of 283–323 K. The solubility data could be well described by the Apelblat equation model as lnx = -99.55 + 1071.66/T + 16.27lnT. The determinations of the effects of various stirring and cooling rates indicated that the MSZW increased with increasing and decreasing cooling and stirring rates, respectively. Furthermore, the induction times at various temperatures and supersaturation ratios were also measured. The results indicated that homogeneous nucleation could occur at high supersaturation, whereas heterogeneous nucleation was more likely to occur at low supersaturation. Based on the classical nucleation theory and induction period data, the calculated solid–liquid interfacial tensions of thiourea in deionized water at 302.46 and 312.58 K were 2.86 and 2.94 mJ·m-2, respectively.

关键词: Thiourea, Metastable zone, Induction time, Cooling crystallization