FIELD: chemistry.
SUBSTANCE: method of reverse liquefaction of a methane-rich fraction, in particular a vaporized gas, is claimed. In this case, the methane-rich fraction is compressed to a pressure that is at least 20% higher than the critical pressure of the fraction to be compressed, liquefied and supercooled. Further, it is discharged to a pressure between 5 and 20 bar and is separated into a gaseous nitrogen-rich fraction and a liquid nitrogen-depleted fraction. The nitrogen-depleted fraction is discharged to a pressure between 1.1 and 2.0 bar. The resulting gaseous fraction without being heated and compressed is mixed in a methane rich fraction. The liquid fraction of the product is obtained by unloading the nitrogen-poor liquid has a nitrogen content ≤1.5 mol. %.
EFFECT: reducing the costs.
5 cl, 1 dwg
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