Abstract

An isothermal study of the kinetic behaviour of calcium oxalate monohydrate dehydration is reported. The results were compared with those obtained in a non-isothermal study. It is shown that kinetic parameters obtained from non-isothermal experiments describe isothermal experiments better than those obtained from the experiments themselves. The kinetic behaviour of calcium oxalate dehydration in both isothermal and non-isothermal conditions is described with accuracy according to a two-step model, namely nucleation, n = 1 2 , E 1 =168 kJ mol −1, and reaction at the cylinder interface, E 2 = 70 kJ mol −1.

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