KINETICS OF THE THERMAL-DECOMPOSITION OF DINITRAMIDE - 3 - KINETICS OF THE HEAT RELEASE DURING THE THERMAL-DECOMPOSITION OF DINITRAMIDE AMMONIUM SALT IN THE LIQUID-PHASE
Ai. Kazakov et al., KINETICS OF THE THERMAL-DECOMPOSITION OF DINITRAMIDE - 3 - KINETICS OF THE HEAT RELEASE DURING THE THERMAL-DECOMPOSITION OF DINITRAMIDE AMMONIUM SALT IN THE LIQUID-PHASE, Russian chemical bulletin, 47(3), 1998, pp. 379-385
The kinetic regularities of the heat release during the thermal decomp
osition of liquid NH4N(NO2)(2) at 102.4-138.9 degrees C were studied.
Kinetic data for decomposition of different forms of dinitramide and t
he influence of water on the rate of decomposition of NH4N(NO2)(2) sho
w that the contributions of the decomposition of N(NO2)(2)(-) and HN(N
O2)(2) to the initial decomposition rate of the reaction at temperatur
es about 100 degrees C are approximately equal. The decomposition has
an autocatalytic character. The analysis of the effect of additives of
HNO3 solutions and the dependence of the autocatalytic reaction rate
constant on the gas volume in the system shows that the self-accelerat
ion is due to an increase in the acidity of the NH4N(NO2)(2) melt owin
g to the accumulation of HNO3 and the corresponding increase in the co
ntribution of the HN(NO2)(2) decomposition to the overall rate. The se
lf-acceleration ceases due to the accumulation of NO3- ions decreasing
the equilibrium concentration of HN(NO2)(2) in the melt.