FIELD: process engineering.
SUBSTANCE: invention relates to method of removal of fractions with high content of nitrogen from initial fraction containing, mainly, nitrogen and hydrocarbons. Note here that initial fraction is separated by rectification into high nitrogen fraction and high methane fraction. High-methane fraction is evaporated and overheated at maximum possible pressure to produce cold. High-nitrogen fraction is at least temporarily and/or partially contracted and fed to rectification as a backflow. In compliance with this invention, at least temporarily, at least partially one partial flow (16) of compressed (C) fraction (9') with high nitrogen content after performed condensation (E1) is expanded (f) in valve and, to produce cold, at least partially, preferably completely, is evaporated (E1).
EFFECT: uniform distribution of compressor load irrespective of nitrogen concentration in initial fraction.
7 cl, 2 dwg
