Nitrogen rejection method and apparatus
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United States of America Patent
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May 20, 2008
Grant Date -
Oct 19, 2006
app pub date -
Jun 14, 2006
filing date -
Sep 6, 2002
priority date (Note) -
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Abstract
Nitrogen is rejected from a pressurized feed gas stream comprising methane and nitrogen by cooling the feed gas stream in a main heat exchanger and rectifying the cooled feed gas stream in a double rectification column comprising a higher pressure rectification column, a lower pressure rectification column, and a condenser-reboiler placing the higher pressure column in heat exchange relationship with the lower pressure column. A pump withdraws a methane product stream from the column. The methane product stream is pressurized by the pump and is vaporized in the main heat exchanger. The pressurized feed gas stream is expanded with the performance of external work in an expansion turbine 6 upstream of the main heat exchanger.
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