METHOD FOR LIQUEFACTION OF FRACTION ENRICHED WITH HYDROCARBONS Russian patent published in 2015 - IPC F25J1/02 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to the method for liquefaction of fraction enriched with hydrocarbons. According to the method cooling and liquefaction of the fraction enriched with hydrocarbons is made by indirect heat exchange with refrigerant mixture in the refrigerant mixture circulating loop. The refrigerant mixture is compressed in two stages, and upon each stage it is separated into gaseous and liquid fractions. Gaseous fraction of the last compression stage is cooled up to the lowest temperature level while liquid fraction of one of intermediate compression stages is cooled up to the temperature level higher than the lowest temperature level. Liquid fraction cooled up to the temperature level higher than the lowest temperature level is cooled by indirect heat exchange with burnt fraction enriched with hydrocarbons. At that the above cooling of liquid fraction cooled up to the higher temperature level takes place by indirect heat exchange with boiling fractions or one boiling fraction that occurs since the stage of separation into gaseous and liquid fraction following the subsequent compression stage.

EFFECT: invention is aimed to prevention of undesired formation of two-phase flow and drawbacks related to it.

6 cl, 2 dwg