抄録
The catalyic hydrodesulfurization of Khafji residual oil (topped crude oil distilled at 300°C and 1 atm.) was studied using both the large and small fixed bed reactors with down flow system at temperature of 350∼430°C, pressure of 50∼110kg/cm2, liquid hourly space velocity (LHSV) of 0.5∼2.0vol/vol/hr and H2/oil volume ratio of 125∼1, 800vol/vol. The cobalt-molybdenum-alumina catalysts were used.
(1) The reaction rate was 2nd order with respect to the sulfur concentration of residue.
(2) The rate constant of the reaction was 1st order with respect to pressure.
(3) The rate constant increased rapidly with increase of H2/oil ratio in the range up to 500vol/vol of H2/oil ratio and slowly in the range of 500vol/vol to 1, 800vol/vol.
(4) The activity of the spherical catalyst of 1mmφ was higher than that of 2mmφ.
(5) The rate constant increased with increasing the height of the catalyst bed and the linear velocity of feed residue.
(6) The modified 2nd order formula that takes the scale effect of the reactor geometry into consideration was introduced as the function of residence time.
