Empirical Rules for the Determination of a Safe Temperature

In the original work, Keller [15] used a detection limit of 20Wkg 1 and a specific heat capacity of 1.8kjkg 1 K obtaining the same result. The explanation is left to the reader as an exercise. 

This procedure for estimating TD24 from the temperature at which the peak onset is detected in a dynamic experiment is justified, since the TM Rad is based on a zero-order approximation and at the beginning of the DSC peak, the conversion is close to zero. Thus, the heat release rate determined by the procedure is not affected by the rate equation, at least for non-autocatalytic reactions, and may be used for the estimation. 

These estimations techniques should only be used as a first approximation, since they are extremely sensitive to the definition of the baseline and hence must 

Figu re 11.8 Comparison of experimental TD24 with the onset in DSC experiments. A prediction rule (lines) can be considered safe if all experimental values are located above the line representing the rule. White dots are pure compounds, black dots are reaction mixtures and distillation residues. 

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