A molecular kinetic model was derived on the basis of FCC reaction mechanism to represent the cracking reactions.Lumps were defined not only by their boiling range but also by their chemical compositions.A molecular lumped approach was then proposed for the FCC reaction in which H transfer

aromatization and yield of fuel gas were taken into account.In order to predict chemical composition of gasoline

eighteen kinetic parameters in the lumped reaction kinetic model were determined by the parameter estimation method.This work showed that the proposed model simulation results were coincident with the experiment data.The proposed model not only could predict successfully the yields

but also could provide more information of the chemical component of gasoline

which is useful in the study on how to reduce the olefins content of gasoline.