No abstract

For dehydration of CaC 2 O 4 ÁH 2 O and thermal dissociation of CaCO 3 carried out in Mettler Toledo TGA/ SDTA-851 e /STAR e thermobalance similar experimental conditions was applied: 9-10 heating rates, q = 0.2, 0.5, 1, 2, 3, 6, 12, 24, 30, and 36 K min-1 , for sample mass 10 mg, in nitrogen atmosphere (100 ml min-1) and in Al 2 O 3 crucibles (70 ll). There were analyzed changes of typical TGA quantities, i.e., T, TG and DTG in the form of the relative rate of reaction/process intended to be analyzed on-line by formula (10). For comparative purposes, the relationship between experimental and equilibrium conversion degrees was used (for P ¼ P É). It was found that the solid phase decomposition proceeds in quasi-equilibrium state and enthalpy of reaction is easily ''obscured'' by activation energy. For small stoichiometric coefficients on gas phase side (here: m = 1) discussed decomposition processes have typical features of phenomena analyzable by known thermokinetic methods.

No abstract