Mathematical Modeling Of The Process For Coupled Propane Dehydrogenation And Hydrogen Oxidation

The growing consumption of propylene derivatives has profoundly increased the propylene demand in recent years.Propane dehydrogenation is believed to have a great potential as a propene booster in the future.In contrast to conventional catalytic dehydrogenation,alternative approach for obtaining higher-than-equilibrium olefin yields and for making the overall process thermal neutral or exothermic is a combination process of catalytic dehydrogenation and selective hydrogen oxidation.But,the process becomes complex due to coupling of dehydrogenation and selective hydrogen oxidation.This research is focused on designing a mathematical model for the coupled process of propane dehydrogenation and hydrogen oxidation in order to achieve better propane conversion and high selectivity based on the kinetics of Pt-Sn/Al2O3 catalyst.A mathematical model has been designed with recycle stream.In this model,an adiabatic CSTR has been designed as a propane dehydrogenation reactor and an adiabatic fixed bed reactor has been designed for hydrogen oxidation.The principal idea of this coupled process is to supply heat for propane dehydrogenation by selective combustion of the hydrogen molecules formed in the dehydrogenation process,which can make the overall process heat-balanced or slightly exothermic and propane conversion also increases.Another benefit is that the resultant steam can prevent coke formation and therefore inhibit the deactivation of catalyst in fixed bed reactor and the catalyst activity in CSTR can be controlled by controlling the continuous regeneration of catalyst in regeneration reactor.