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Chemcial Industry and Engineering 2022, Vol. 39 Issue (3) :33-41    DOI: 10.13353/j.issn.1004.9533.20210107
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Cooling crystallization process of ammonium persulfate
ZHANG Yulong1, GUO Shengzheng1, ZHAO Jianwei2, ZHANG Junjie2, GONG Junbo1
1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. Hebei Jiheng Group Co., Ltd., Hebei Hengshui 053000, China

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Abstract In industry, ammonium persulfate was usually separated from the electrolyte of ammonium sulfate. This work is aiming at providing thermodynamic and dynamic data for the crystallization of ammonium persulfate in ammonium sulfate aqueous solution. Ternary phase diagrams of (NH4)2S2O8-(NH4)2SO4-H2O at different temperatures were firstly determined with isothermal solubility method, providing a thermodynamic basis for the optimization of the cooling crystallization of ammonium persulfate. In addition, laser method was applied to determine the supersolubility and the effects of cooling rate and stirring rate on the metastable zone widths of (NH4)2S2O8 were investigated, the nucleation kinetic parameters were calculated using the Self-consistent Nyvlt-like equation. Induction time of (NH4)2S2O8 nucleation in pure water at different temperatures were also measured to analyze the correlation of induction period and the supersaturation.
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Articles by authors
ZHANG Yulong
GUO Shengzheng
ZHAO Jianwei
ZHANG Junjie
GONG Junbo
Keywordsammonium persulfate   cooling crystallization   ternary phase diagram   induction period   metastable zone     
Received 2021-03-15;
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ZHANG Yulong, GUO Shengzheng, ZHAO Jianwei, ZHANG Junjie, GONG Junbo.Cooling crystallization process of ammonium persulfate[J]  Chemcial Industry and Engineering, 2022,V39(3): 33-41
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