Catalytic cracking of metal-contaminated oils
AssigneeMobil Oil Corporation
InventorsFred S. Zrinscak, Sr., Grant G. Karsner
Life of this patent
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Abstract
Metal-contaminated oils, including mildly hydrotreated residual oils, are catalytically cracked in the absence of added hydrogen in a fluid catalytic cracking process wherein the regenerated catalyst has less than about 0.05 wt. % residual carbon. By conducting regeneration of the catalyst to that level at 1300.degree. to 1400.degree. F. (preferably at about 1350.degree. F.) with excess air, additional benefits are realized in that metal deposited on the catalyst by cracking of residual stocks is thereby passivated.
Claims25
A process for catalytically cracking a metal-contaminated residual feedstock containing about 0.50 to 15.0 Nickel Equivalents of metal, which comprises, in combination:
- contacting said feedstock under cracking conditions in a cracking zone and in the absence of added hydrogen with fluidized, regenerated cracking catalyst characterized by a metals content of 700 to 5,000 Nickel Equivalent of metal and having less than about 0.10 wt. % residual carbon, whereby forming cracked products and deactivated, coked catalyst;
- separating said deactivated, coked catalyst from said cracked products;
- passing said separated, deactivated catalyst to a regeneration zone;
- contacting said deactivated coked catalyst in said regeneration zone with an excess of oxygen containing gas at 1300 to 1400F. to form said regenerated cracking catalyst having less than about 0.10 wt. % residual carbon with production of a flue gas containing free oxygen;
- and recycling said regenerated catalyst to said cracking zone, whereby selectively forming liquid cracked products.
A process for fluid catalytic cracking of a chargestock comprising a residual oil, said chargestock containing at least about 0.50 ppm to about 15 ppm Nickel Equivalents of metal, which comprises contacting said chargestock under cracking conditions and in the absence of added hydrogen with a regenerated fluid cracking catalyst that contains about 700 to 5,000 ppm Nickel Equivalents of metal and less than about 0.05 wt. % residual carbon and recovering cracked products, said catalyst having been regenerated at 1300.degree. to 1400.degree. F. in an atmosphere containing an excess of oxygen.
A process for catalytically cracking a metal-contaminated feedstock, said feedstock containing from about 0.50 to 5.0 ppm Nickel Equivalents of metal, which comprises, in combination:
- contacting said feedstock under cracking conditions in a cracking zone and in the absence of added hydrogen with fluidized, regenerated cracking catalyst which contains a trace amount of metal selected from the 5th and 6th periods of Group VIII of the Periodic Table and rhenium and is characterized by a metals content of 700 to 5,000 ppm Nickel Equivalents of metal and having less than about 0.10 wt. % residual carbon, whereby forming cracked products and deactivated, coked catalyst;
- separating said deactivated, coked catalyst from said cracked products;
- passing said separated, deactivated catalyst to a regeneration zone;
- contacting said deactivated coked catalyst in said regeneration zone with sufficient oxygen containing gas to substantially completely combust carbon monoxide to carbon dioxide and to form said regenerated cracking catalyst having less than about 0.10 wt.% residual carbon with production of a flue gas which contains less than about 2,000 ppm carbon monoxide;
- and recycling said regenerated catalyst to said cracking zone, whereby selectively forming liquid cracking products.
A process for fluid catalyst cracking of chargestock comprising a residual oil, said chargestock containg about 0.50 ppm to about 15 ppm Nickel Equivalents of metal, which comprises contacting said chargestock under cracking conditions and in the absence of added hydrogen with a regenerated fluid cracking catalyst that contains a trace amount of at least one metal selected from the group consisting of periods 5 and 6 of Group VIII of the Periodic Table and rhenium and about 700 to 5,000 ppm Nickel Equivalents of metal and less than about 0.05 wt. % residual carbon, and recovering cracked products.
Dependencies are inferred from the claim text.