SEPARATION METHOD FROM LIQUEFACTION OF ASSOCIATED PETROLEUM GAS WITH ITS ISOTHERMAL STORAGE Russian patent published in 2014 - IPC F25J1/00 F25J3/00 F25B9/04 

FIELD: heating.

SUBSTANCE: after associated petroleum gas is cooled in a recuperative heat exchanger, it is separated in a multistage centrifugal separator from oil-petroleum liquid fractions, water condensate and mechanical impurities, which are removed for further processing to a gas fractionation unit, and a gaseous fraction is supplied for two-stage compression. To the first stage together with the separated gaseous fraction there supplied is vapour phase from an above-surface isothermal storage for repeated liquefaction, and gas compressed after the first stage is supplied for liquefaction to a three-flow vortex tube so that cold, hot gaseous and liquid flows are formed. To the second compression stage there supplied is a mixture of a hot flow from the vortex tube and a cold flow after recuperative heat exchangers. Gas flow compressed at the second stage is supplied to the separator after recuperative cooling; after that, the gaseous fraction is supplied to a main gas line or a fuel network, and liquefied gas together with liquid phase separated from hot flow of the vortex tube is supplied to the above-surface isothermal storage.

EFFECT: use of the invention will allow improving efficiency of processes for separation of target hydrocarbon fractions.

1 dwg