Desolvation mechanism and kinetics of pymetrozine dihydrate

化学工业与工程

Chemcial Industry and Engineering

2023, Vol. 40

Issue (5) :30-39 DOI: 10.13353/j.issn.1004.9533.20210844

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Desolvation mechanism and kinetics of pymetrozine dihydrate

CHEN Wei^1,2,3, YAO Qichao¹, WU Di^1,2, JI Xu^1,2, LIN Weihao¹, QU Siyuan¹, LI Jiulong^1,2, LI Chang^1,2, ZHOU Lina^1,2,3

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. National Engineering Research Center of Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
3. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China

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Abstract This research analyzed the thermal desolvation mechanism and kinetics of pymetrozine dihydrate by TGA/DSC. The result showed that in nitrogen atmosphere, the desolvation enthalpy of pymetrozine dihydrate desolvation is 154 kJ·mol^-1. The pymetrozine dihydrate’s desolvation process matched with the 3-dimensional nucleation and growth model (Avrami-Erofeev equation, n=4) well (R²>0.99) in this case. The Flynn-Wall-Ozawa equation was used to analyse the correlation of conversion rate and temperature changing rate, respectively. It revealed different apparent activation energy and pre-exponential factor A by two correlation methods. By fitting all the data of various temperature changing rates and conversion rates, the various heating rate method can fix the two fitting methods’ deviation and reveal credible data. It revealed apparent activation energy at 44.85 (±6.59) kJ·mol^-1 (95% confidence) and lg(A/min^-1) at 9.54(±1.08) (95% confidence), R²=0.8141. To certify the data and compare the fitting methods, Kissinger method was used to obtain apparent activation energy and a pre-exponential factor A. The verification sustained the conclusion by the various heating rate method.

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	CHEN Wei
	YAO Qichao
	WU Di
	JI Xu
	LIN Weihao
	QU Siyuan
	LI Jiulong
	LI Chang
	ZHOU Lina

Keywords： pymetrozine solvate desolvation kinetics thermal analysis

Received 2021-11-13;

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CHEN Wei, YAO Qichao, WU Di, JI Xu, LIN Weihao, QU Siyuan, LI Jiulong, LI Chang, ZHOU Lina.Desolvation mechanism and kinetics of pymetrozine dihydrate[J] Chemcial Industry and Engineering, 2023,V40(5): 30-39

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