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Method for producing olefins using a doped catalyst

  • US 7,943,038 B2
  • Filed: 01/29/2008
  • Issued: 05/17/2011
  • Est. Priority Date: 01/29/2008
  • Status: Active Grant
First Claim
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1. A process for producing one or more olefins, comprising:

  • doping a hydrocarbon cracking catalyst, comprising;

    fluidizing one or more coked-catalyst particles in the presence of one or more oxidants to provide a fluidized mixture;

    removing at least a portion of the coke from the one or more coked-catalyst particles to provide regenerated catalyst particles within the fluidized mixture;

    distributing one or more doping agents to the fluidized mixture;

    depositing the one or more doping agents onto a surface of the regenerated catalyst particles to provide doped catalyst particles;

    forming a reaction mixture comprising one or more hydrocarbon feeds and the doped catalyst particles;

    cracking at least a portion of the reaction mixture to provide a first product comprising propylene, ethylene, and butane;

    selectively separating at least a portion of the first product to provide a second product comprising propylene and a first recycle comprising butane; and

    recycling at least a portion of the first recycle to the one or more hydrocarbon feeds.

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