
324 Green Chemical Engineering
4.1.2.1.3 Instantaneous Reaction
Instantaneous reactions are innitely fast reactions. The reaction of A occurs at a much
faster rate than the transfer of A through the liquid lm. Molecules of A, on encountering
the molecules of B in the liquid lm, would get converted into products instantaneously.
If we assume that the ux N
AL
of A from the interphase to the bulk of the liquid and the
ux N
BL
of B from the bulk of the liquid to the interphase are in the stoichiometric ratio,
that is,
N
AL
AL
=
(4.101)
then the reaction between A and B would occur on a plane within the liquid lm located at
a distance y
1
from t