Process for removing nitrogen from LNG

Details Process for removing nitrogen from LNG Process for removing nitrogen from LNG

1995-05-09

1996-04-09

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 41, F25J 300

Patent

active

055050492

ABSTRACT:
A process for removing nitrogen from liquefied natural gas (LNG) using an enhanced surface, reflux heat exchanger is disclosed. A relatively warm high pressure LNG stream is directed countercurrently in heat exchange with a cool low pressure LNG stream to chill the high pressure stream and partially vaporize the low pressure LNG stream in the reflux heat exchanger. Vapor produced thereby strips the low pressure LNG stream of nitrogen. The cool low pressure LNG stream is produced by expansion of the chilled high pressure LNG stream. Vapor produced by the expansion is combined with the vapor produced in the exchanger and withdrawn overhead. Product LNG which is lean in nitrogen is withdrawn from the bottom of the exchanger.

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Finn, A., Chemical Engineering, vol. 101, No. 5, pp. 142-147, May 1994.
Costain Oil, Gas & Process, Ltd. Plate Fin Exchanger Bulletin, 1989, pp. 5-9.

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