Heat-quench-heat method in adiabatic calorimetry: determining decomposition mechanism model and kinetic evaluation with lower thermal inertia experimental data

Adiabatic calorimetry is one of the main experimental methods to quantitatively study the thermal hazard in chemical process. There are two problems in adiabatic calorimetry: (1) identification of the reaction model is difficult; (2) the equilibrium of system and the temperature uniformity of sample will be broken under the rapid temperature rise rate, especially at lower thermal inertia. In this work, the heat-quench-heat method in adiabatic calorimetry was proposed to determine the reaction model and slow the reaction rate to evaluate kinetic parameters accurately. A criterion was proposed to identify the reaction model which states that the decomposition is an n-order reaction if T 0,stage1 < T 0,stage2 ; otherwise autocatalytic behavior was observed. Mathematical simulations have been conducted for n-order and autocatalytic decompositions. To further validate the method, it is applied to two representative substances: DTBP and CHP. The validity of this method has been verified by simulation and experiment results.