METHOD OF LIQUIDISING FLOW WITH HIGH CONTENT OF HYDROCARBONS Russian patent published in 2015 - IPC F25J1/02 

FIELD: chemistry.

SUBSTANCE: described is method of liquidising fraction with high content of hydrocarbons with simultaneous removal of fraction with high C₂₊ content with cooling and fraction liquefying taking place with indirect heat-exchange by means of mixture of refrigerants of circulation circuit of refrigerant mixture, in which mixture of refrigerants is subjected to at least two-step compression, and separation of fraction with high C₂₊ content taking place at regulated temperature level, with mixture of refrigerants being separated into gaseous and liquid fractions, both fractions are overcooled, expand, in fact, to pressure of absorption of first stage of compressor and are at least partly evaporated. In accordance with invention at least one partial flow (19, 24) of liquefied, first of all gaseous fraction of refrigerant mixture (15) is expanded (j, h) and admixed to expanded liquid fraction of refrigerant mixture (22).

EFFECT: invention is aimed at creation of reliable method of liquefying fraction with high content of hydrocarbons and at provision of effective and controlled removal of ethane and higher hydrocarbons in the course of natural gas liquefying.

6 cl, 2 dwg