Abstract
The mechanisms of the first two stages of the thermal decomposition of calcium oxalate monohydrate have been established from isothermal mass-loss studies. For both stages, the rate-controlling process is phase boundary reaction with cylindrical symmetry. The isothermal kinetic parameters computed from the mechanism-based equation show the same trend as those from the mechanism-non-invoking approach. For the decomposition of calcium oxalate to calcium carbonate and carbon monoxide, the kinetic constants are not appreciably affected by sample mass, while for the dehydration of calcium oxalate monohydrate, they show a systematic decrease with increase in sample mass. The bestfit correlations have been represented as: E (or log A) = C 1 − C 2 m + C 3 m 2
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