B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/54 (2006.01) C01B 21/04 (2006.01) F25J 3/02 (2006.01)
Patent
CA 2448467
Nitrogen is rejected from a feed natural gas stream comprising methane and nitrogen so as to form a primary methane product. The mole fraction of nitrogen in the feed natural gas increases over a period of time. The feed natural gas stream is cooled in a main heat exchanger 10 and is rectified in a double rectification column 20. A primary product methane stream and a secondary nitrogen-enriched product stream are withdrawn from the rectification column 20. The secondary nitrogen- enriched product stream has a mole fraction of methane at or above a chosen minimum value when the said mole fraction of nitrogen is at a minimum. When the said mole fraction of nitrogen rises to a value at which the mole fraction of methane in the secondary nitrogen-enriched product stream falls below the chosen minimum, a part of the feed gas is introduced through conduit 90 into the secondary nitrogen- enriched product stream so as to restore its mole fraction of methane to the chosen minimum value or a value thereabove.
Davies Brian Morice
Oakey John Douglas
Gowling Lafleur Henderson Llp
The Boc Group Plc
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