[DELTA][G.sub.b]--Gibbs free energy at isokinetic temperature, kJ [kg.sup.-1]; and,
In order to validate the enthalpy-entropy compensation theory, the Krug test (Eq.9) was applied to compare the isokinetic temperature ([T.sub.B]) with the mean harmonic temperature ([T.sub.hm]), whose approximate confidence interval (1-[alpha]; 100%) for the isokinetic temperature was calculated by Eq.
The established decrease in the values of [E.sub.a] and lnA under microwave heating compared to the conventional heating permits the possibility of new explanation of the influence of microwave heating on the kinetics of isothermal dehydration based on integration of Larsson model of activating the molecule via selective energy transfer (SET model) [44] and Linert concept of isokinetic temperature [45].
Based on the assumptions above, in accordance with the SET model, considering this resonance system as a classical forced damped harmonic oscillator, it is possible to get the expression for reaction rate constant and isokinetic temperature ([T.sub.ic]):
This indicates the existence of an
isokinetic temperature ([T.sub.i]), because in the case of a series of pyrolysis processes there is a temperature [T.sub.i] at which the rate constant exhibits the same value [k.sub.i].
The
isokinetic temperature has been used to characterize the temperature at which the product is in equilibrium, i.e., when all reactions occur simultaneously (Goneli et al., 2016a).
However, only the difference between the harmonic mean temperature ([T.sub.hm]) and the
isokinetic temperature ([T.sub.B]) may indicate that such relationship exists (enthalpy-entropy compensation theory).
Aiming to test the validity of the differential enthalpyentropy compensation theory,
isokinetic temperature was compared to the mean harmonic temperature from the temperature range used in this work.