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Process and apparatus for multi-stage regeneration of catalyst in a bubbling bed catalyst regenerator and side mounted fast fluidized bed regenerator

  • US 5,047,140 A
  • Filed: 04/27/1990
  • Issued: 09/10/1991
  • Est. Priority Date: 04/27/1990
  • Status: Expired due to Fees
First Claim
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1. A process for the fluidized catalytic cracking of a heavy feed to lighter more valuable products by mixing, in the base of a riser reactor, a heavy crackable feed with a source of hot regenerated catalytic cracking catalyst withdrawn from a catalyst regenerator, and cracking said feed in said riser reactor to produce catalytically cracked products and spent catalyst which are discharged from the top of the riser into a catalyst disengaging zone wherein cracked products are separated from spent catalyst, spent catalyst is discharged from said disengaging zone into a catalyst stripper contiguous with and beneath said disengaging zone and wherein said spent catalyst is contacted with a stripping gas to produce stripped catalyst, and said stripped catalyst is collected in a vertical standpipe beneath the stripping zone and then discharged from said standpipe into a catalyst regeneration zone contiguous with and beneath said stripping zone, and said regeneration zone comprises a single dense phase bubbling fluidized bed of catalyst to which an oxygen containing regeneration gas is added and from which hot regenerated catalyst is withdrawn and recycled to said riser reactor, characterized by:

  • discharging said stripped catalyst from said catalyst standpipe into a closed spent catalyst transfer vessel which is at least partially below said bubbling dense bed;

    adding a fluidizing gas to said transfer vessel in an amount sufficient to fluidize the spent catalyst and transfer said spent catalyst via a transfer line into a coke combustor pod at an elevation above said transfer vessel and to a side of said regenerator vessel;

    adding oxygen or an oxygen containing gas to said coke combustor vessel in an amount sufficient to provide a superficial vapor velocity which will maintain a majority of the catalyst therein in a state of turbulent or fast fluidization;

    transferring catalyst and flue gas from said coke combustor into a transfer line connective with said dilute phase region within said regenerator vessel containing said bubbling fluidized bed; and

    discharging and separating catalyst and flue gas from said transfer line in a disengaging means which directs separated catalyst from said transfer line down into said bubbling fluidized bed.

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