In this work a kinetic model for the naphtha catalytic reforming process is
presented. The model utilizes lumped mathematical representation of the re
actions that take place, which are written in terms of isomers of the same
nature. These groups range from 1 to 11 atoms of carbon for paraffins, and
from 6 to 11 carbon atoms for naphthenes and aromatics. The cyclohexane for
mation via methylcyclopentane isomerization and paraffins isomerization rea
ctions were considered in the model. Additionally, an Arrhenius-type variat
ion was added to the model in order to include the effect of pressure and t
emperature on the rate constants. The kinetic parameters values were estima
ted using experimental information obtained in a fixed-bed pilot plant. The
pilot reactor was loaded with different amounts of catalyst in order to si
mulate a series of three reforming reactors. The reformate composition calc
ulated with the proposed model agrees very well with experimental informati
on.