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NGL EXTRACTION FROM LIQUEFIED NATURAL GAS

  • US 20130104598A1
  • Filed: 12/17/2012
  • Published: 05/02/2013
  • Est. Priority Date: 09/03/2008
  • Status: Abandoned Application
First Claim
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1. A process for the separation of C2+ or C3+ hydrocarbons from a liquefied natural gas (LNG) stream, comprising:

  • providing a first stream of liquid LNG having a pressure of at least 600 psig;

    passing the first stream through a first heat exchanger to vaporize the LNG and form a second stream;

    expanding the second stream in an turbo-expander to form a third stream having reduced pressure and temperature as compared to the second stream;

    introducing a first portion of the third stream to a distillation column at one or more feed trays;

    passing a second portion of the third stream through the first heat exchanger to be cooled by heat exchange with the first stream to form a fourth stream;

    introducing the fourth stream to the distillation column at a point higher than the first portion of the third stream inlet;

    withdrawing a fifth stream of vapor hydrocarbon from an upper portion of the distillation column having a reduced content of C2+ or C3+ hydrocarbons as compared to the first stream;

    compressing the fifth stream in a turbo-compressor coupled to and powered by the turbo-expander;

    withdrawing a sixth stream of liquid hydrocarbon from a lower portion of the distillation column having an increased content of C2+ or C3+ hydrocarbons as compared to the first stream.

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