The extrapolation of a set of thermoanalytical (TA) curves to infinite temperature is proposed as a possible method to calculate the kinetic parameters of solid-state reactions from the TA curves without assuming a constant heating late. It is shown theoretically that the method is applicable for the TA curves under any temperature program if the kinetic model function does not change among the temperature conditions applied. The practical applicability of the method is investigated through the kinetic analysis of TA curves for the thermal decomposition of synthetic malachite CuCO3 . Cu(OH)(2). The present method of kinetic analysis is widely useful for nonlinear nonisothermal TA curves in which the sample temperature does not change linearly.