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CONFIGURATIONS AND METHODS OF INTEGRATED NGL RECOVERY AND LNG LIQUEFACTION

  • US 20130061633A1
  • Filed: 11/08/2012
  • Published: 03/14/2013
  • Est. Priority Date: 07/07/2005
  • Status: Abandoned Application
First Claim
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1. A method of producing a liquefied natural gas (LNG) from a natural gas feed stream, comprising:

  • providing the natural gas stream at a pressure of between 800 and 1600 psig, and cooling the natural gas stream using a feed gas pre-cooling circuit to form a vapor portion and a liquid portion of the cooled natural gas stream;

    expanding the vapor portion of the natural gas stream in an expander to form an expanded natural gas vapor, and feeding the expanded natural gas vapor to a separator;

    producing a cold overhead product stream in the separator, wherein the separator receives a reflux stream that is cooled in a reflux refrigeration circuit;

    compressing the cold overhead product stream in a compressor without prior substantial heating of the cold product stream, wherein the compressor is driven by the expander, and wherein the compressed cold product stream has a pressure of at least 700 psig and a temperature of less than −

    50°

    F.;

    liquefying the cold compressed product stream in a liquefaction unit using refrigeration content from a liquefaction refrigeration circuit; and

    wherein the feed gas pre-cooling circuit, the reflux refrigeration circuit, and the liquefaction refrigeration circuit are distinct circuits.

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