Nitrogen rejection from natural gas

Details Nitrogen rejection from natural gas Nitrogen rejection from natural gas

1982-05-10

1983-10-25

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 29, 62 33, 62 34, 62 40, F25J 302

Patent

active

044116772

ABSTRACT:
A process is disclosed for rejecting nitrogen from a natural gas feed containing nitrogen over a wide range of compositions, e.g. 5-85% nitrogen by volume, under elevated pressure using a single distillation column and a closed loop methane heat pump which reboils and refluxes the column. An intermediate reflux condenser is refrigerated by both the heat pump and overhead nitrogen fraction from the distillation column. The process can handle feeds with increasing nitrogen content and more than 100 ppmv carbon dioxide. The feed can be at pipeline pressure with the natural gas liquid components still present or at lower pressure with natural gas liquids removed. A mixed cryogenic refrigerant can be used in the heat pump as an alternative to methane. The process provides a high methane recovery over the entire feed range, and provides a nitrogen product stream having an elevated pressure suitable for recycling and reinjection to an oil or gas well to improve well head pressure.

REFERENCES:
patent: 3238735 (1966-03-01), Siewart
patent: 3797261 (1974-03-01), Juncker et al.
Linde Reports on Science and Technology 15/1970, pp. 51-52.

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