| 摘要 |
An expanded (102) and cooled (106) crude LNG stream (108) is separated in a nitrogen rejection column (150) into a nitrogen-enriched overhead vapor s tream (130) and a nitrogen-diminished bottoms liquid stream (110). The botto ms stream (110) is pumped (112) to higher pressure, divided into first and s econd streams (114 & 116) and then the second stream is reduced in press ure and at least partially vaporized (118) by heat exchange (106) against th e crude LNG feed stream (104) to cool said feed stream and provide (120) boi lup to the nitrogen rejection column (150).
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