| 摘要 |
2099274 9211938 PCTABS00014 A two-stage process and apparatus for the regeneration of fluidized catalytic cracking (FCC) catalyst is disclosed. A primary regenerator (1) having a single dense bed (260) with a spent catalyst inlet (40), a source of oxygen-containing gas (10), a flue gas outlet (70) and a regenerated catalyst outlet (30), is supplemented with a secondary regenerator. The secondary regenerator (B) has its own source of air (210) for combustion and takes particles from a lower portion of the dense bed (250) in the primary regenerator (1). Combustion gases, and some solids, are discharged from the secondary regenerator into the primary regenerator (1). Hot, decoked material is withdrawn from the base of the secondary regenerator (B) for use in the catalytic cracking reaction. Preferably, a dense, fast settling additive is used with a conventionally sized FCC catalyst. These two materials can be added together to the primary regenerator (1) and separated by elutriation therein into two catalyst phases. Preferably most of the conventionally sized FCC catalyst is regenerated in the primary regenerator (1), while a most of the denser additive is decoked in the secondary regenerator (B).
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