Pressure-identification method in adiabatic calorimetry: Determining decomposition mechanism model from initial conversion based on experimental pressure data

Adiabatic calorimetry is one of the main experimental methods to quantitatively study the thermal hazard in chemical process. In this work, a pressure-identification method has been developed to determine the reaction model and evaluate the kinetic parameters in adiabatic process. A theory, named ‘Equivalent adiabatic theory’ was proposed to verify the accuracy of the pressure correction, which states that the calculated generated gas amount is dependable if the equivalent adiabatic initial temperature is constant; otherwise, it is unreliable. Initial conversion calculated by credible generated gas amount can be used as a truth value to determine the kinetic model from models with good fitting by temperature data. Further, this method is applied to two representative substances: 20% DTBP in toluene and 25% CHP in cumene. The validity of this method has been verified by experiment results.