2,4-二硝基甲苯热解自催化特性鉴别及其热解动力学

doi:10.3866/PKU.WHXB201212141

Abstract

Abstract:

The thermal stability and autocatalytic decomposition of 2,4-dinitrotoluene (2,4-DNT) is investigated under dynamic and isothermal conditions using differential scanning calorimetry (DSC). The temperature range of initial exothermic temperature (T₀) is 272.4-303.5℃, and its decomposition enthalpy (ΔH_d) is about 2.22 kJ·g^-1. An identification method based on a numerical simulation technique from the Swiss Institute for the Promotion of Safety and Security (Swiss method) is used to determine the characteristic parameters of the decomposition reaction, revealing that the decomposition of 2,4-DNT is potentially autocatalytic. The Malek method is used to determine the most probable mechanism function and kinetic parameters of 2,4-DNT decomposition. The Sestak-Berggren model with two parameters is suitable to describe the autocatalytic decomposition of 2,4-DNT, which is consistent with the results of the Swiss method and isothermal experimental results. Isothermal DSC experiments confirmed that the decomposition of 2,4-DNT is autocatalytic.

Key words: Autocatalytic decomposition reaction, Differential scanning calorimeter, Rapid identification, Malek method, Decomposition kinetics

BAO Shi-Long, CHEN Wang-Hua, CHEN Li-Ping, GAO Hai-Su, LÜ Jia-Yu. Identification and Thermokinetics of Autocatalytic Exothermic Decomposition of 2,4-Dinitrotoluene[J]. Acta Phys. -Chim. Sin. 2013, 29(03), 479-485. doi: 10.3866/PKU.WHXB201212141

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Identification and Thermokinetics of Autocatalytic Exothermic Decomposition of 2,4-Dinitrotoluene

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