Theoretische und experimentelle Untersuchungen der partiellen Oxidation von Ethan im Wirbelschicht-Membranreaktor

The product yield in heterogeneously catalyzed partial oxidation is limited thermodynamically but can be improved with new reactor configurations. A new reactor principle was studied experimentally and theoretically in which the individually controlled feeds were metered across a membrane or membranes. The studies were in a fluidized bed membrane reactor using as example the oxidative dehydrogenation of ethane to ethylene. The feeds (oxygen and ethane) were metered individually. The oxygen passed across a porous membrane into the inert gas flow loaded with hydrocarbon. The fluidized bed provided high intensity of mass, heat, and impulse transport processes and good mixing. Ethane was oxidized in a 100 by 100 mm reactor made of SICROMAL10) at 1 atm. The VOx/γ-Al2O3 catalyst (d32 = 1.8 mm) had a 1.49 vol % metal content and a specific surface area of 181 sq m/g. To determine the influence of the reaction conditions on the ethane conversion and ethylene selectivity, the temperature (450°-590°C) and the modified contact time (100-260 kg-sec/cu m) were varied in the conventional fluidized bed reactor and fluidized bed membrane reactor. The dependence of ethylene yield on ethane/oxygen ratio in different reactor configurations was illustrated. At smaller ethane/oxygen ratios higher ethylene yields were achieved in the fluidized bed membrane reactor. A model was developed to describe the partial oxidation in a bubble forming fluidized bed. The heterogeneous two phase theory was used. The simulations obtained with the model were compared with experiment.

Options

Theoretische und experimentelle Untersuchungen der partiellen Oxidation von Ethan im Wirbelschicht-Membranreaktor