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Method for cold supply to the low-temperature separation stage of an olefin plant

  • US 7,554,002 B2
  • Filed: 02/07/2007
  • Issued: 06/30/2009
  • Est. Priority Date: 02/08/2006
  • Status: Active Grant
First Claim
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1. A method for producing olefins from hydrocarbon-containing feed using a refrigerant and a low-temperature separation stage, said method comprising:

  • introducing a hydrocarbon feed containing olefins into a fractionation stage which is a front end deethanizer which separates the hydrocarbon feed into a first olefin stream containing olefins having at most two carbon atoms, and a second olefin stream containing olefins having at least three carbon atoms; and

    introducing at least a portion of said first olefin stream into a low-temperature separation stage comprising three condensation stages, operating at temperatures of −

    50°

    C. to −

    100°

    C., said low-temperature separation stage being connected downstream of said front end deethanizer, wherein the refrigerant used in said three condensation stages consists essentially of a liquid olefin fraction having two carbon atoms removed from said front end deethanizer, and wherein said method omits a compressor cycle for ethylene refrigerant for said condensation stages.

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