Abstract Trichloroisocyanuric acid (TCCA) is a widely used novel and highly efficient disinfectant, bactericide, and bleaching agent. However, numerous accidents have occurred during the production, storage, and usage of TCCA, and its thermal stability has not been systematically studied. This study investigates the thermal stability of TCCA in a closed environment using dynamic differential scanning calorimetry (DSC), adiabatic accelerating rate calorimetry (ARC), and a combined testing method; the Friedman method was employed to conduct two decomposition kinetics studies based on DSC test data, as well as a combination of DSC and ARC test data. The results show that TCCA is thermally sensitive, with an onset decomposition temperature of 237.81°C and a decomposition heat release of 940 J/g. The decomposition process is strongly exothermic, and loss of control may lead to severe consequences. The kinetic parameters obtained from the two decomposition kinetic studies are highly consistent. The starting temperature corresponding to a time to maximum rate (TMR) of 24 h for the thermal decomposition of TCCA, T D24 , is 216.1°C, which provides important technical and data support for determining safety limits in the production, storage, and use of TCCA.
Song et al. (Fri,) studied this question.