Nitrogen rejection method and apparatus

Details Nitrogen rejection method and apparatus Nitrogen rejection method and apparatus

2008-05-20

2008-05-20

Doerrler, William C (Department: 3744)

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

C062S927000, C062S628000

Reexamination Certificate

active

07373790

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 turbine6upstream of the main heat exchanger.

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