A trickle-bed heterogeneous plug flow reactor for hydrotreating was modeled and simulated in steady-state conditions. The effect of important operating variables such as temperature, pressure, weight hourly space velocity (WHSV) and feed API gravity were studied over and under normal conditions ranges. Evaluation of simulated results showed that H2, H2S and organic sulfur (S) concentration profiles are very close in both liquid and solid phases. Thus, the differential– algebraic equations (DAEs) system were converted to particular stiff ordinary differential equations (ODEs) and solved simultaneously with simulink toolbox in MATLAB. The Simulation validation confirms good agreement with available experimental data. Furthermore, the effect of temperature and pressure on product organic sulfur content are presented. The temperature gradient obtained along the reactor bed by considering non-isothermal assumption., emphasizes necessity of using quench streams.

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