CIESC Journal ›› 2013, Vol. 64 ›› Issue (11): 4054-4059.DOI: 10.3969/j.issn.0438-1157.2013.11.023

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Thermal decomposition and isothermal kinetic model of bis-2, 4-dichlorobenzoyl peroxide

LÜ Jiayu, CHEN Wanghua, CHEN Liping, LU Guibin, GAO Haisu, TIAN Yingtao   

  1. Department of Safety Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
  • Received:2013-04-03 Revised:2013-04-25 Online:2013-11-05 Published:2013-11-05

2,4-二氯过氧化苯甲酰的热分解及等温动力学模型

吕家育, 陈网桦, 陈利平, 路贵斌, 高海素, 田映韬   

  1. 南京理工大学化工学院安全工程系, 江苏 南京 210094
  • 通讯作者: 陈网桦
  • 作者简介:吕家育(1988-),女,博士研究生。

Abstract: Bis 2,4-dichlorobenzoyl peroxide(DCBP)is usually used as an initiator,a hardener,and a vulcanizing agent in rubber industry.As a kind of organic peroxides,the peroxy group(-O-O-)may cause the thermal instability and explosion likelihood of DCBP.To analyze the potential hazards of its thermal decomposition,the differential scanning calorimetry(DSC)was used to test the thermal behavior of DCBP under dynamic and isothermal conditions.Kinetic parameters calculated by the Friedman iso-conversional method indicated the autocatalysis possibility of this decomposition.DSC curves obtained at five constant temperatures confirmed a strong autocatalytic reaction of DCBP.Exothermic onset temperature of DCBP was 98℃ and activation energy was between 232 kJ·mol-1 and 236 kJ·mol-1 under dynamic evaluation.When scanning at 92℃ in isothermal mode,the time to maximum rate was less than 30 min,so the best constant temperature for evaluation under this mode should be no higher than 92℃ to prevent loss of heat-flow signal.By simulating the five isothermal curves,a kinetic model was established and the mechanism function was found.As all data showed that reaction progress was short and reaction rate was high,it is best to avoid external heating and sudden energy transfer during DCBP manufacture,transportation and storage.Meanwhile,emergency rescue plans should be prepared for minimization of loss once accident happens.

Key words: thermal decomposition, kinetics, autocatalysis, isothermal model, mechanism function

关键词: 热分解, 动力学, 自催化, 等温模型, 机理函数

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