PARAMETRIC STUDY OF HYDRODESULFURIZATION AND HYDRODEAROMATIZATION OF GASOIL IN HYDROTREATING PROCESS OVER CoMo-S CATALYST USING A PILOT PLANT INTEGRAL REACTOR

Hydrodesulfurization (hds) and hydrodearomatization (hda) of a real straight run gas oil (srgo) were investigated over como-s sulfide catalyst in a high-pressure fixed-bed integral reactor. the effect of the key process parameters on the quality of product was studied by varying the temperature (200-370°c), pressure (20 to 50 bar) and space velocity (1 to 4.7h^-1). experimental results revealed that hds,% activity improved up to 81% when the temperature was increased up to 370°c but reduced to 60% with increase of space velocity up to 4.7 h^-1. it has been also found that the rate of hda, % activity enhanced up to 40.6% by increasing pressure up to 50 bar. the cetane index underwent an increase of 1-3 degrees and gravity increased by 1-1.7 °api. the implication of these results on refining industry is that mild hydrotreating of diesel fuels using the single-stage technology will not enable local refineries to produce diesel fuel meeting the current specifications (<15 ppmwt) except with severe/deep once-through desulfurization or twostage once- through desulfurization with or without splitting the first reactor effluent.