The Effect of Hydrogen Permeation Using Membrane on Outlet Ethylene Selectivity of Dual Type Catalytic Reactor System Contains Fischer-Tropsch Reactor

In this research, mathematical model and simulation of two consecutive reactors of Oxidative Coupling of Methane (OCM) and Fischer Tropsch synthesis (FTS) was investigated that FT reactor was analysed in two different ways: fixed bed conventional reactor and membrane dual type fixed bed reactor (The combination of two reactors of conventional fixed bed reactor and membrane fixed bed reactor). In this structure, feedstock of FT reactor (second reactor) is provided via OCM process. This model is used to produce valuable hydrocarbons such as ethylene from methane. The model was solved numerically by using the finite difference approximation and a set of first order ordinary differential equations (ODE) in the axial direction. The results are indicated that by placing the FT reactor after OCM reactor, we can use the by-products of OCM reactor, as a result increase the production of ethylene and other valuable hydrocarbons. Moreover, results showed that the use of dual type membrane fixed bed FT reactor after OCM caused the hydrogen permeation via membrane and improved the yield of ethylene up to 3% and also caused a decrease in the production of by-products of FT reactor (reduction in carbon dioxide yield up to 6%) compared to the conventional fixed-bed FT reactor.