Nitrogen rejection method and apparatus

Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture

Reexamination Certificate

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C062S927000

Reexamination Certificate

active

06837071

ABSTRACT:
Nitrogen is rejected from a feed gas stream comprising methane and nitrogen so as to form a methane product. The feed gas is separated in a double rectification column comprising a higher pressure rectification column 14, a lower pressure rectification column 16, and a condenser-reboiler 18. Product methane is withdrawn from the column 16 by a pump 42 and is vaporised. A flow of gas is recycled from the column 16 to the column 14, being warmed in main heat exchanger 4. A first part of the warmed recycle gas being compressed in compressor 48 to a first pressure and introduced into the higher pressure rectification column 14. A second part of the warmed recycle gas is compressed in the compressor 48 and condensed in a second condenser-reboiler associated with an intermediate main exchange region of the lower pressure column 16 and is returned to the higher pressure rectification column 14.

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M. Ruhemann, “Cryogenin Techniques in Enhanced Recovery of Oil and Gas,” Indian Journal of Cryogenics, 1984, vol. 9, No. 4, pp. 256-261.

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