Calculation of Activation Energy of Commercial Grade H2O2 from DSC for Using Evaluation Thermal Hazard

Hydrogen peroxide is a strong oxidizing agent containing a peroxide functional group that easily decomposes. In this research, a commercial grade of 35 % w/w hydrogen peroxide was evaluated for thermal hazard and reactivity by differential scanning calorimetry (DSC). It was found that the calculated activation energy was 70.03 kJ/mol. The risk assessment of thermal hazard evaluated in terms of the adiabatic decomposition temperature rise at heating rate 2, 4 and 8 °C/min, were 236.5, 159.2 and 217.5 K, respectively. While the time-to-maximum rate were 79.1, 52.6 and 28.3 second, respectively. Therefore, the storage, transportation and usage, proper care must be highly careful by trained and qualified person or the chemist knowledgeable personnel.

Study on the Thermal Sensitivity of Energetic Materials Characterized by Accelerating Rate Calorimeter (ARC)

Liquid energetic materials were not tested through traditional test methods for thermal sensitivity. Accelerating Rate Calorimeter (ARC) was scientific to test thermal sensitivity of energetic materials. The decompositions of Hexogen (RDX), Octogen (HMX), 2,4,6-Trinitrotoluene (TNT), Nitromethane (NM), Iso-propyl Nitrate (IPN) were studied by ARC. Kinetic and thermodynamics parameters were calculated and analyzed. Temperature corresponding different time to maximum rate under adiabatic condition (θ) was calculated. The results show that the thermal sensitivity of energetic materials is NM>IPN>RDX>HMX>TNT, which suggests ARC could be used in the test of thermal sensitivity of liquid energetic materials.

Safety Assessment on Hydrogen Peroxide for Storage and Transportation Based on Runaway Scenario

Hydrogen peroxide is a very versatile reagent for many industrial processes. Nevertheless, it is very sensitive to impurities that can catalyze its decomposition violently. Combining the recent year’s hydrogen peroxide explosion accidents, this paper seeks to establish the evaluation model for its safe storage and transportation. Firstly, the runaway scenario that can serve as a basis for the assessment of the thermal risk was briefly described. Secondly, the adiabatic temperature increase () and the pressure for closed systems were used as the severity of the assessment criteria. Both closed and open systems were discussed. Thirdly, the time to maximum rate (TMRad) was presented as the probability of occurrence of the scenario. Finally, the established model was exemplified by two examples both with and without contamination. The results show that at 20°C the severity of 30(wt.) % H2O2is critical and a small amount of Fe3+(12.7mg∙L-1) reduces theTMRadof 30(wt.) % H2O2by almost a factor of eleven. This approach can assess the safety of hydrogen peroxide for storage and transportation in advance.