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Thermal risk assessment and grading of chemicals with instantaneous power density

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Abstract

The heat release behaviors of several chemical compounds were detected with C80 calorimeter. Furthermore, the thermodynamic and kinetic parameters of the chemicals were obtained based on the experimental data. Chemical thermal risk was simultaneously graded with combined use of instantaneous power density and the classification standard of thermal instability which was offered by the standard system for the identification of the hazards of materials for emergency response (NFPA704). The results show that the grading standard of thermal risk based on NFPA704 was reasonable and can be used as a preliminary thermal risk assessment for reaction hazards.

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Abbreviations

C 0 :

Initial reaction rate of reactant

Rate:

Reaction rate of reactant (g mL−1 s−1)

M 0 :

Initial mass of reactant

M :

Mass of reactant at time t

A :

Pre-exponential factor of Arrhenius equation (s−1)

E a :

Activation energy (kJ mol−1)

ΔH :

Reaction heat of unit reactant (kJ mol−1)

q G :

Heat release (kJ mol−1)

t :

Reaction time (min)

T :

Temperature of system at time t (K)

T o,s :

Onset exothermic temperature

n :

Reaction order

k :

Constant of reaction rate

R :

Gas constant (8.31415 J mol−1 K−1)

dH/dt :

Overall heat flow (W)

dT/dt :

Self-heat rate (K s−1)

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Authors and Affiliations

  1. College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, 266042, Shandong, China

    Daoxing Sun, Jing Gu & Jie Sun

  2. Sinopec Safety Engineering Institute, Qingdao, 266071, Shandong, China

    Chuanxin Xie, Fan Zhang & Jing Gu

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  1. Daoxing Sun
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  2. Chuanxin Xie
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  3. Fan Zhang
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Correspondence to Daoxing Sun.

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Sun, D., Xie, C., Zhang, F. et al. Thermal risk assessment and grading of chemicals with instantaneous power density. J Therm Anal Calorim 109, 1373–1377 (2012). https://doi.org/10.1007/s10973-011-1836-7

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  • DOI: https://doi.org/10.1007/s10973-011-1836-7

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