Nitrogen removal with iso-pressure open refrigeration...

Details Nitrogen removal with iso-pressure open refrigeration... Nitrogen removal with iso-pressure open refrigeration...

C - Chemistry, Metallurgy

10

G

C10G 5/06 (2006.01) C10L 3/10 (2006.01)

Patent

CA 2694648

A process for recovery of natural gas liquids is disclosed, the process including: fractionating a gas stream comprising nitrogen, methane, ethane, and propane and other c3+ hydrocarbons into at least two fractions including a light fraction comprising nitrogen, methane, ethane, and propane, and a heavy fraction comprising propane and other c3+ hydrocarbons; separating the light fraction into at least two fractions including a nitrogen- enriched fraction and a nitrogen-depleted fraction in a first separator; separating the nitrogen- depleted fraction into a propane-enriched fraction and a propane-depleted fraction in a second separator; feeding at least a portion of the propane-enriched fraction to the fractionating as a reflux; recycling at least a portion of the propane-depleted fraction to the first separator. In some embodiments, the nitrogen-enriched fraction may be separated in a nitrogen removal unit to produce a nitrogen- depleted natural gas stream and a nitrogen-enriched natural gas stream.

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