Simulation of high velocity fluidized bed reactors for the oxidative coupling of CH4. (18p.)

The maximum attainable hydrocarbon yield in CH4 oxidative coupling is known to be limited by secondary combustion reactions of ethylene towards undesired carbon oxides. It was then suggested that improved coupling selectivities could be obtained by employing reactor types which minimize the exposure of hydrocarbon species in zones of high O2 concentrations. Reactors operating in the high-velocity fluidization regime provide promising options for an optimum design, allowing for both large gas-solid contacting efficiencies and limited axial gas dispersion. A reactor model has been developed to simulate the performance of high-velocity fluidized bed reactors. The pressure distribution and the catalyst concentration profiles along the reactor were estimated on the basis of literature models and correlations. Results are presented under a variety of operating conditions, and conclusions are drawn on the applicability of the high-velocity fluidized bed technology in the oxidative coupling process.