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Figure 10.10 Powerlaw kinetic options.
where k is the reaction rate constant, T and T 0 are the reaction and reference tem-
peratures, E , is the activation energy, and n , is an arbitrary coefficient. The input
for the kinetic factor can be configured without a reference temperature by setting n
and T 0 equal to zero. Setting the activation energy to zero leaves only the reaction
rate constant. The driving force for the reaction depends on the concentration basis
selected. For example, when the Driving Force button is pushed and molarity is chosen
as the concentration basis, the driving force is the continuous product of the compo-
nent concentrations raised to exponents defined in Figure 10.13. The rate expression
becomes
r = kC α i
i
(10.12)
Searching Aspen Plus's Help for kinetic factors will yield an entry Rate Con-
trolled Reactions, which provides much detailed documentation—most important, the
power-law expressions used for each possible concentration basis.
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