THERMOGRAVIMETRY - EMPIRICAL APPROXIMATION FOR THE TEMPERATURE INTEGRALS

The temperature integrals {Mathematical expression} with m=0, 1/2 and 1 are approximated using empirical formulae of the type Ax-Be-Cx. For estimation of the precision of these approximations, the relative errors were calculated for integral values of x. It was established that for x < 19 the maximum relative error is 0.26%, while for 19 ≤x<50 it is less than 0.1%. The suggested approximations allow a sensible improvement of the integral methods intended to determine the kinetic parameters of the process concerned. © 1990 Wiley Heyden Ltd, Chichester and Akadémiai Kiadó, Budapest.