CIESC Journal ›› 2016, Vol. 67 ›› Issue (S1): 22-27.doi: 10.11949/j.issn.0438-1157.20151737

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A new method for calculating time to maximum rate under adiabatic condition

GUO Zichao, HAO Lin, WEI Hongyuan   

  1. Tianjin University-AstraZeneca Process Safety Laboratory, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2015-11-19 Revised:2015-12-01 Online:2016-08-31 Published:2016-08-31
  • Supported by:

    supported by the National Natural Science Foundation of China (21576196).

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Abstract:

Time to maximum rate under adiabatic condition (TMRad) is a widely-used parameter for evaluation of the probability of decomposition reactions of substances or reactive mixtures under adiabatic conditions. The traditional method for calculation of TMRad necessitates the kinetics and thermodynamics of the decomposition reactions, such as pre-exponential factor, activation energy, reaction order and decomposition enthalpy. To calculate the TMRad using accelerating rate calorimeter (ARC), a whole thermal curve including both onset decomposition temperature and final temperature is required. However, due to the complexity of reaction mechanism or safe operation of calorimetric experiment, the final temperature is often unavailable, meaning the traditional method is in failure. Therefore, to solve this problem, this paper proposes a new method for calculating TMRad, which is based on the assumption that the consumption of reactants is negligible within a narrow temperature range relative to the whole exothermic curve. Moreover, the experiment results also prove the flexibility of this new method to exothermic curve including final temperature.

Key words: secondary decomposition reactions, thermodynamics, safety, stability, time to maximum rate under adiabatic condition, accelerating rate calorimeter

CLC Number: 

  • O642.1
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