According to the theoretical basis of thermokinetics, the thermokinetic reduced parameter equation of opposing reaction has been derived, and the mathematical models of the reduced parameter method for opposing reaction have been established. Only needing the thermoanalytical data at the characteristic time parameter t~m and 2t~m from a single thermoanalytical curve, both the reduced energy and the reduced time parameter can be easily obtained, and then the rate constants and the equilibrium constant of slower opposing reaction can be easily obtained, and then the rate constants and the equilibrium constant of slower opposing reaction can be calculated conveniently. In order to test the validity of this method, the thermokinetics for the proton-transfer reaction of nitroethane with ammonia at 15 and 25℃, and with Tris at 15 and 30℃ have been studied, respectively. The experimental results indicate that the theory and method of the reduced parameter method for slower opposing reactions are correct.

Key words: THERMODYNAMICS, CALORIMETRY, NITROETHANE, AMMONIA, PROTONS, TRANSFER REACTIONS