ABSTRACT
A chemical process involves not only chemical reactions but also involves surface and mass/energy transport phenomena. The chemical reactions are defined by the stoichiometry, in which reactants are directly related to the products of the reaction. Therefore, the stoichiometry is defined the measurement of the composition of one of the components allows to relate it with the composition of other components. However, the order to the reaction rate does not always follow the stoichiometry. In this particular case, the kinetics of the reaction is not simply represented by a single step but involves several intermediate steps. In order to differentiate them, the reactions are divided as follows:
Irreversible reactions: those which are carried out in a single direction A+B→R+ S. Reversible reactions: those which are carried out in both directions (direct and reverse). Elementary reactions: those which are carried out in a single step. Non-elementary reactions: those which are carried out in several elementary steps,
and whose resultant reaction may not be elementary.
