FIELD: process engineering.
SUBSTANCE: claimed invention relates to separation of nitrogen-bearing stock fraction with high content of hydrocarbons, preferably, of natural gas. Claimed separation of nitrogen-bearing stock fraction with high content of hydrocarbons (1, 1') comprises separation of the stock fraction (1, 1') by rectification (T1, T2) into fraction (5) enriched with nitrogen and nitrogen-depleted fraction with high content of hydrocarbons (10). Note here that said rectification is carried out at the fractionator composed by the preliminary separation column (T1) and the main fractionator (T2). Note here that the fluid fraction 6 bled from the fraction (7, 7', 7") and fed to the main fractionator (T2) above the loading points. Said fraction 6 is fed as the reverse into the column (T1). Note here that bleeding point and/or volume of said fraction (6) are selected so that nitrogen-depleted fraction with high content of hydrocarbons (10) bled from the main fractionator still (T2) contains the fraction of the highest hydrocarbons in the amount of less than 1 ppm.
EFFECT: separation and removal of the highest hydrocarbons from the still product without plugging.
1 dwg
