METHOD OF LIQUEFYING NATURAL GAS CONTAINING NITROGEN (VERSIONS) Russian patent published in 2025 - IPC F25J1/00 

FIELD: liquefaction of gases.

SUBSTANCE: invention relates to a method of liquefying natural gas containing nitrogen. Invention can be used for removal of nitrogen from liquefied natural gas. Proposed method of liquefying natural gas containing nitrogen includes the following steps: feeding a stream of inlet natural gas into a mass-exchange column, in which the stream of inlet gas is liquefied and separated into a nitrogen-enriched gas taken from the top of the column, and liquefied natural gas taken from the bottom of the column; heating of nitrogen-rich gas taken from the top of the column in at least one heat exchanger, followed by its compression in a compressor, successive cooling in a cooling apparatus and a heat exchanger, expansion and supply of the formed two-phase flow to the upper part of the mass-exchange column. Compressor capacity is selected so that gas flow rate through it is at least 2.5 times higher than flow rate of inlet natural gas.

EFFECT: simplified design of gas liquefaction plant.

24 cl, 4 dwg, 3 tbl