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This study assessed the parametric sensitivity of cyclonite production in a batch reactor. The objective was to establish safe operation conditions for this highly exothermic reaction. The reaction rate law was adjusted using experimental data published in the related literature. Mass and energy balances were reparametrized. Thus, reaction temperature sensitivity criteria were established as a function of initial reaction and cooling temperatures. Critical reaction conditions were defined using temperature sensitivity, temperature conversion, and the locus of the maximum temperature trajectories. A critical heat generation potential (M) equal to 34 was defined along with the following runaway critical conditions: a Semenov number (ψ) equal to 0.684, a heat of reaction parameter (B) equal to 15, and an Arrhenius-type number (γ) of 20. Therefore, temperature conversion profiles specify a critical relation between the cooling and heat potential (N/M) of 2.5786.