Rate constant of reaction

Thus for a specific volume associated with the flow rate q, and for the rate of reaction constant k we can obtain the volume of the reactor that is needed to achieve a certain conversion. Rearranging equation (6.6) gives us... 

Equations (10-6) and (10-7) show that for the intermediate case the observed rate is a function of both the rate-of-reaction constant, ic and.. the mass-transfer coefficient k. In a design problem k and k would be known, so that Eqs. (10-6) and (10-7) give the global rate in terms of Cj. Alternately, in interpreting laboratory kinetic data k would be measured. If k is known, k can be calculated from Eq. (10-7). In the event that the reaction is not first order Eqs. (10-1) and (10-2) cannot be combined easily to eliminate C. The preferred approach is to utilize the mass-transfer coefficient to evaluate Q and then apply Eq. (10-2) to determine the order of the reaction n and the numerical value of k. One example of this approach is described by Olson et al. ... 

However, it is these very procedures which exploit the unique capability of DSC. There has been something of a drive towards obtaining kinetic constants from a single dynamic experiment. Although the results obtained in this way may fulfil a useful function further tests are invariably needed to explore the possibility of limitations to their applicability. Advantages have been claimed for sample controlled kinetic experiments in which the experimental conditions are varied in order to maintain the rate of reaction constant. This has proved a popular method of temperature control in thermogravimetry although in principle it can be applied to DSC. 

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