Author:

Keywords:

Ethylene, Energy saving process, Reactor design, Oxidative dehydrogenation

Abstract:

In this work we investigate the theoretical performance of an industrial wall-cooled packed-bed reactor for ODH-Et over a highly active/selective MoVTeNbO catalyst. The feasibility of using this complex yet necessary reactor design, as well as the influence of operating conditions on conversion and yield along the reactor are analyzed. The simulations are carried out using a two-dimensional pseudo-heterogeneous model, which makes use of both a reliable kinetic model and reliable transport parameters. Specifically, the kinetic model, obtained from labscale experimental data, is coupled to the reactor model accounting for transport phenomena wherein the effect of hydrodynamics on heat transfer is assessed from independent experiments in absence of reaction in an industrial-scale reactor. The developed kinetics successfully accounts for both the inhibiting effect of adsorbed water on oxidative dehydrogenation and total oxidations and the effect of the inlet partial pressure of oxygen and ethane on conversion and selectivity. Besides, the reactor model elucidates the importance of accounting for the role of the hydrodynamics on the heat transport in order to have reliable conversion and yield predictions. From the parametric sensitivity study, the temperature of the coolant fluid is an important variable for tuning the reactor performance.