Dissolution thermokinetics of dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate in dimethyl sulfoxide

The enthalpies of dissolution for dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50) in dimethyl sulfoxide were measured using a RD496-2000 Calvet microcalorimeter at four different temperatures under atmospheric pressure. Differential enthalpies (Δdif H) and molar enthalpies (Δdiss H) of dissolution were determined. Furthermore, the corresponding kinetic equations describing the dissolution processes at the four experimental temperatures are dα/dt = 10−2.60(1 − α)1.01 (T = 298.15 K), dα/dt = 10−2.59(1 − α)0.93 (T = 303.15 K), dα/dt = 10−2.58(1 − α)1.36 (T = 308.15 K), dα/dt = 10−2.57(1 − α)1.21 (T = 313.15 K). The determined values of the activation energy E and pre-exponential factor A for the dissolution process are 3.24 kJ mol−1 and 10−2.03 s−1, respectively.