| 摘要 |
The present invention is an in-situ cleaning procedure for the recovery of catalytic activity of a based alumina HDS catalyst, molybdenum, nickel coated coke and contaminants and it has an HDS activity seriously diminished. The catalyst under study had between 13 and 18 wt % total carbon. In order to reactivate the same, a mixture of solvents is prepared with the following volumetric ratio: Reformate, half the total volume, industrial toluene=70 % of the volume and Iso-propane alcohol 30 % of the volume. Or it can also be used only reformate (100% volume). The solvent mixture is passed using a LHSV of 2 hr-1 for 72 hours at 50 DEG C. or also using a recirculating three 24-hour cycles at 50 DEG C. Option lasts 24 hours pure reformate LHSV=2h-1 to 50 DEG C. The washed catalyst is fed back to the load reaction conditions maintained for 36 hours at 340 DEG C., to initiate HDS activity balances. During this treatment oxides of molybdenum and nickel in the active phase are re-sulfided by i ncreasing the HDS activity. The In-Situ Cleaning procedure to reactivate deactivated hydrotreating catalysts used to partially remove the carbon and increase the active phase of molybdenum di-sulphide, and also retrieve specific area, and hydrogenation sites that promote higher hydrodesulfurization activity of gasoil after this treatment. |
