Nitrolysis kinetics of DADN by N₂O₅/HNO₃

Concentrations of reactant, intermediate, product were measured by HPLC during nitrolysis of DADN(1, 5-diacetyl-3, 7-dinitro-1, 3, 5, 7-tetraazacyclooctane)by N₂O₅/HNO₃ at temperatures of 303, 313, 323, and 333 K. Based on the mechanism of the nitrolysis reaction(first-order consecutive reaction), the kinetic parameters were calculated from these data obtained. The activation energies were 2.3996×10⁴ J·mol^-1 for the first step(DADN to SEX(1-acetyl-3, 5, 7-trinitro-1, 3, 5, 7-tetrazacyclooctane))and 1.6598×10⁴ J·mol^-1 for the second step(SEX to HMX(high melt point explosive)), and the pre-exponential factors were 2.2000×10⁴ h^-1 and 6.5178×10² h^-1, respectively. The reaction rate constant is larger for the fist step than for the second one. In order to check the intermediate in nitrolysis reaction of DADN, an experiment was carried out to separate and identify the intermediate(also by-product). The results indicate that this intermediate is SEX.