METHOD OF SEPARATING NITROGEN FROM LIQUEFIED NATURAL GAS Russian patent published in 2012 - IPC F25J3/02 

FIELD: chemistry.

SUBSTANCE: method of separating an N₂-rich fraction from a liquefied hydrocarbon-rich fraction is described, in particular from liquefied natural gas, wherein the liquefied hydrocarbon-rich fraction, after its liquefaction and supercooling, is fed into a stripping column which serves for separating the N₂-rich fraction. According to the invention, a first substream of the liquefied hydrocarbon-rich fraction (2, 2') is fed into the stripping column (S) as reflux, whereas a second substream of the liquefied hydrocarbon-rich fraction (3, 3') is fed into the bottom of the stripping column (S), wherein the second substream of the liquefied hydrocarbon-rich fraction (3, 3') has a higher temperature than the first substream of the liquefied hydrocarbon-rich fraction (2, 2').

EFFECT: use of the invention increases stability of operation of the apparatus.

6 cl, 1 dwg