350 results about "Dissolved hydrogen" patented technology

The invention discloses a residual oil hydrotreating method, the method uses a fixed bed radial reactor for residual oil hydrogenation reaction, catalyst bed layers of the fixed bed radial reactor are respectively loaded, from the inside to the outside, with a protective agent, a hydrodemetallization catalyst, a hydrodesulfurization catalyst and a hydrodenitrogenation / carbon residue removal catalyst, raw oil mixed with dissolved hydrogen enters from the reactor bottom via a feed tube for hydrotreating reaction, hydrogenated generation oil is collected by a generation oil collection zone, and then discharged out of the reactor. The method avoids the defects that in the prior art, when the hydrodemetallization activity of a front catalyst of a fixed bed residual oil hydrogenation unit is lost, hydrodemetallization reaction is undertaken completely by a rear catalyst, and the rear catalyst deactivation is accelerated, overall improves the active resource utilization rate of catalysts, and can effectively reduce the varieties and specifications of the catalysts without too much increase of the protective agent, the raw oil can be in stable and long-term operation at the optimum reaction temperature, and temperature increasing operation is not needed for compensation of the catalyst activity.