Nitrogen rejection from condensed natural gas

专利名称：Nitrogen rejection from condensed natural

gas

发明人：Adam Adrian Brostow,Mark Julian

Roberts,Christopher Geoffrey Spilsbury

申请号：US10444029申请日：20030522

公开号：US20040231359A1公开日：20041125

专利附图：

摘要：Method for the rejection of nitrogen from condensed natural gas whichcomprises (a) introducing the condensed natural gas into a distillation column at a first

location therein, withdrawing a nitrogen-enriched overhead vapor stream from thedistillation column, and withdrawing a purified liquefied natural gas stream from thebottom of the column; (b) introducing a cold reflux stream into the distillation column ata second location above the first location, wherein the refrigeration to provide the coldreflux stream is obtained by compressing and work expanding a refrigerant streamcomprising nitrogen; and (c) either (1) cooling the purified liquefied natural gas stream orcooling the condensed natural gas stream or (2) cooling both the purified liquefiednatural gas stream and the condensed natural gas stream, wherein refrigeration for (1) or(2) is obtained by compressing and work expanding the refrigerant stream comprisingnitrogen. The refrigerant stream may comprise all or a portion of the nitrogen-rich vaporstream from the distillation column.

申请人：BROSTOW ADAM ADRIAN,ROBERTS MARK JULIAN,SPILSBURY CHRISTOPHERGEOFFREY

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