Lumped Kinetic Model For FCC Gasoline Hydro-Upgrading (M-DSO) Process

A comprehensive review for the technologies and kinetic models of fluid catalytic cracking (FCC) gasoline upgrading was done. Based on the M-DSO combined process which was developed by China National Petroleum Corporation and on the reaction mechanism and technical features of M upgrading stage and DSO hydrogenation stage, the lumped reaction networks of hydrocarbons and sulfide species in gasoline were established respectively to get the kinetic equations of lumped reaction models. Based on experimental data, the kinetic parameters of hydrocarbon upgrading and desulfurization of M process and DSO process were calculated by Runge-Kutta method and BFGS optimization algorithm and VS C++ platform. It is demonstrated that in the aspect of hydrocarbon upgrading, the obtained kinetic parameters can reflect the reaction rules well and the relative errors of calculated values and actual values for the hydrocarbon lump contents are all less than 5%. Based on the analysis for the kinetic parameters from M-DSO and DSO-M processes, the M-DSO process is better than DSO-M process in both oletin-reducing and octane number recovery for catalytic cracking gasoline upgrading. In the aspect of desulfurization, the obtained kinetic parameters are consistent with hydro-desulfurization reaction rules and the relative errors of calculated values and actual values of removal rates of sulfur species were all less than 2%. All mentioned above can illustrate that the established models for hydrocarbon upgrading and desulfurization are reliable. According to the established kinetic models, the effect of operation conditions on the hydrocarbon composition and sulfur removal can be predicted to guide industrial production.