LUMPED KINETIC MODEL OF AROMATIC TYPE CATALYTIC NAPHTHA REFORMING

According to the guiding principles of lumping theory,a new kinetic model involving 27 lumped components and 52 reactions for catalytic naphtha reforming was developed to satisfy the commercial reforming units to produce aromatics based on the reaction mechanisms,and a mathematic model is formed for continuous reforming moving-bed radial-flow reactor.The C8 aromatics were divided into ethylbenzene and xylene,and C9 aromatics were divided into trimethylbenzene,methylethylbenzene and propylbenzene respectively in the modeling.The 111 parameters were estimated based on the data from plant,which coincided well with the mechanisms of reforming reactions catalyzed by typical bifunctional catalyst.The deactivation constants showed that the deactivation on acidic sites of bifunctional catalyst was more serious than on its metal sites.The simulation of UOP commercial continuous reforming unit was carried out for verifying the model.The results showed that perfect agreement of material compositions and catalyst coke content at the exit of the fourth reactor was obtained between simulated values and actual values,which means that the model could predict aromatic composition in detail and provide a basis for optimization of reforming unit to produce aromatics.