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Abstract

A nitrogen recovery apparatus for recovering nitrogen from natural gas comprises a separator having a liquid fraction port and a vapour fraction port in fluid communication with a split flow arrangement, the split flow arrangement having a sub-cooled fluid path and an expanded fluid path. A fractionating column has a reflux inlet port in fluid communication with the subcooled fluid path above a middle feed port thereof, the middle feed port being in fluid communication with the expanded fluid path. A bottom feed port of the fractionating column is in fluid communication with the liquid fraction port of the separator. A side reboiler circuit and a reboiler circuit are operably coupled to the fractionating column below the bottom feed port. A bottom hydrocarbon product stream path is in fluid communication with a bottom hydrocarbon port of the fractionating column.

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First Claim