Hydrocarbon recovery from fuel gas

Details Hydrocarbon recovery from fuel gas Hydrocarbon recovery from fuel gas

F - Mech Eng,Light,Heat,Weapons

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F25J 3/00 (2006.01) B01D 53/047 (2006.01) C07C 7/12 (2006.01) F25J 3/02 (2006.01)

Patent

CA 1297781

ABSTRACT OF THE DISCLOSURE 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 distilla- tion the rejected nitrogen being employed for purging the CO2-laden ad- sorbent 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 conbination with pressure let-down by gas withdrawal into one or more companion beds.

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