Some remarks on equilibrium state in dynamic condition |
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Authors: | Andrzej Mianowski Izabela Baraniec-Mazurek Rafał Bigda |
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Affiliation: | (1) Departament of Chemistry, Inorganic Technology and Fuels, Silesian University of Technology, Krzywoustego 6, 44-100 Gliwice, Poland;(2) Institute for Chemical Processing of Coal, Zamkowa 1, 41-803 Zabrze, Poland; |
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Abstract: | For dehydration of CaC2O4·H2O and thermal dissociation of CaCO3 carried out in Mettler Toledo TGA/SDTA-851e/STARe 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 Al2O3 crucibles (70 μl). 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 = Pominus P = P^{{ominus}} ). 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: ν = 1) discussed decomposition processes have typical features of phenomena analyzable by known thermokinetic methods. |
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