1984 Volume 27 Issue 6 Pages 489-495
The middle distillate from the Condor shale oil was hydrotreated on a Ni-Mo-Al2O3 commercial catalyst (Table 1) to clarify the relationships between operating conditions and the properties of product oils. Hydrotreating experiments were carried out in a hydrogenflowing-fixed bed reactor (Fig. 1) in the presence of 20ml of the catalyst. The reaction conditions were: reaction temperature(310-370°C), hydrogen pressure (25-100kg/cm2) and LHSV (0.5-1.5/h).
The properties of feedstock and product oils are shown in Table 2. The increase in reaction temperature, in hydrogen pressure and in reciprocal LHSV exhibited a significant removal of nitrogen and sulfur (Figs. 2 and 3). In particular, hydrodesulfurization was easily performed under milder conditions. Hydrodenitrogenation required, however, severer conditions, for example, oil with a nitrogen content of less than 10ppm was obtained at 370°C and 100kg/cm2. Denitrogenation could be expressed as a pseudo-first order reaction kinetics with respect to reciprocal LHSV (Fig. 4). The activation energies, which were dependent on hydrogen pressure, were 10.6, 17.4 and 30.1kcal/mol at 25, 50 and 100 kg/cm2, respectively (Fig. 5).
With increase in the reaction temperature, in the hydrogen pressure and in the reciprocal LHSV, a decrease in specific gravity and viscosity (Figs. 6 and 7) and an increase in H/C were observed (Fig. 8). Distillation temperatures of 5, 50 and 95wt% of the oil measured by gaschromatographic distillation versus reaction conditions are shown in Fig. 9. It is reasonable to think that the shale oil was not cracked markedly because of these lower reaction temperatures.
