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Cat cracker gas plant process for increased olefins recovery

  • US 6,576,805 B2
  • Filed: 06/05/2001
  • Issued: 06/10/2003
  • Est. Priority Date: 02/22/1999
  • Status: Expired due to Term
First Claim
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1. A process for recovering olefins from hydrocarbons produced in a fluid catalytic cracking unit, the process comprising:

  • a. providing hydrocarbons produced in a fluid catalytic cracking unit, said hydrocarbons comprising ethylene, ethane, propylene, propane, butane, butylene, and C5 and heavier components;

    b. pressurizing said hydrocarbons to a pressure in the range of approximately 120 psig to 300 psig;

    c. cooling said pressurized hydrocarbons;

    d. feeding said cooled, pressurized hydrocarbons to a separator operated at a temperature in the range of approximately 80 degrees F. to 120 degrees F. and a pressure in the range of approximately 120 psig to 270 psig;

    e. yielding from said separator a gas stream comprising a major portion of the propane and lighter components of said hydrocarbons and substantially all of the ethylene in said hydrocarbons;

    f. separating hydrogen and methane from said gas stream, thereby forming an ethylene and heavier stream;

    g. separating ethane and lighter components from said ethylene and heavier stream, thereby forming an ethane and lighter stream and a propylene and heavier stream;

    h. yielding from said separator a liquid stream that comprises a portion of said propylene, propane and heavier components of said hydrocarbons;

    i. feeding said liquid stream from said separator to a stripper tower;

    j. operating said stripper tower to remove as a stripper overhead stream a major portion of the propane and lighter components from said liquid stream fed to said stripper tower;

    k. feeding said stripper overhead stream into the hydrocarbons entering said separator; and

    l. yielding from said stripper tower bottom a de-propanized liquid stream.

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