Hydrocarbon recovery from fuel gas

Details Hydrocarbon recovery from fuel gas Hydrocarbon recovery from fuel gas

1986-12-12

1988-08-02

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

55 25, 55 53, 55 62, 62 20, F25J 300

Patent

active

047611677

ABSTRACT:
High purity methane is recovered from a fuel gas stream containing the same in admixture with mainly nitrogen and carbon dioxide, by first removing the carbon dioxide by selective adsorption in a PSA system and separating the remaining nitrogen from the methane by cryogenic distillation, the rejected nitrogen being employed for purging the CO.sub.2 -laden adsorbent beds of the PSA system. Cyclic regeneration of the sorbent-laden bed may entail nitrogen purge with or without including a carbon dioxide rinse, or the nitrogen purge of the sorbent-laden bed may be used in combination with pressure let-down by gas withdrawal into one or more companion beds.

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patent: 4561865 (1985-12-01), McCombs et al.
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Oil & Gas Journal, "Dome's NRU is Successfully Treating Gas from an EOR Project", by Alvarez, M. R. et al., published Aug. 20, 1984 at pp. 95-99.

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