Nitrogen rejection unit

Refrigeration – Processes – Circulating external gas

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62 24, 62 27, 62 31, 62 43, F25J 302

Patent

active

049368885

ABSTRACT:
An improved apparatus and process are disclosed for nitrogen rejection from a gaseous hydrocarbon stream recovered from an enhanced oil recovery project employing nitrogen for miscible flood of oil reservoirs. The process utilizes a modified dual distillation column arrangement including two fractionators which do not utilize overhead reflux condensers or reboilers for separating a nitrogen-methane mixture. Further, process conditions can be adjusted so as to provide efficient nitrogen rejection from a feedstream in which nitrogen content varies widely over a comparatively long period of time during enhanced recovery of oil.

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Looney, S. K., et al., Technology, Oil and Gas Journal, 12-17-84, pp. 103-108.

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