Study on the Safety Design of 3-Amino-6-Bromo-1,2,4-Triazine Drying Process Based on Thermal Analysis Technology

: The thermal decomposition behavior of 3-amino-6-bromo-1,2,4-triazine (ABTA) with different moisture contents was studied with a differential scanning calorimeter (DSC). It was found that the thermal stability of the original wet ABTA was worse than that of the qualified dry ABTA. As the drying process proceeded and water was removed from ABTA, the first exothermic shoulder of the original wet ABTA disappeared gradually, and the thermal stability of ABTA improved accordingly. It was verified by the interruption and rescanning method that the decomposition behavior of the qualified dry ABTA followed the N-order reaction, while that of the original wet ABTA had obvious autocatalytic characteristics. The multistep series model was used to fit the thermal decomposition behaviors of the original wet ABTA and the qualified dry ABTA to obtain their decomposition kinetic parameters and predict their heat release behaviors under ideal adiabatic conditions. It was shown that the qualified dry ABTA was safe at 40-50 degrees C within 48 h, while the original wet ABTA had a great risk of a thermal runaway at 40-50 degrees C. The Thomas model was used to predict the heat release behavior of the original wet ABTA, which further confirmed the risk of a thermal runaway of the original wet ABTA in the drying process of production. Based on the relevant research results, the safety design requirements and safety operation precautions of the ABTA production drying process were determined.

Automated summary

The study found that the thermal stability of qualified dry ABTA was better than that of the original wet ABTA. As water was removed from ABTA, its thermal stability improved, and the decomposition behavior of the qualified dry ABTA followed an N-order reaction.