Two Dimensional Dynamic Modeling of ...

In this research a pseudo-homogeneous two-dimensional model was proposed to describe the dynamic behavior of a fixed-bed pilot-plant hydrodesulphurization reactor. The catalyst pellet used in this reactor was Co-Mo/Al2O3. At first, using the experimental data, a power law kinetic model was developed for hydrodesulphurization reaction. Then a pseudo-homogeneous two-dimensional dynamic model was proposed to describe the concentration profile in the reactor bed. The simulation obtained with the proposed dynamic model showed good agreement with experimental data and the sulfur concentration error in the reactor outlet was 3.8 percent compared to the experimental data. Two dimension modeling revealed that the radial variation of sulfur concentration is more in the reactor inlet than the outlet, but in general the concentration profile can be considered in one dimension. Unsteady reactor modeling showed that the transition time was higher in the reactor outlet and estimated to be 11667 seconds.