FIELD: chemistry.
SUBSTANCE: invention relates to method of removing fraction with high nitrogen content. Described is method of removing fraction with high hydrogen content from initial fraction, which contains mainly nitrogen and hydrocarbons, with initial fraction being separated by method of rectification into fraction with high nitrogen content and fraction with high methane content in order to obtain cold is evaporated and overheated under possibly maximal pressure with respect to initial fraction to be cooled. In accordance with invention still liquid or partially evaporated fraction with high methane content is supplied to circulation tank, liquid portion of fraction with high-methane content formed in circulation tank preferably in the process of natural circulation is completely evaporated, and head main product of circulation tank is overheated.
EFFECT: invention is aimed at reliable and stable evaporation of fraction with high nitrogen content.
7 cl, 4 dwg
