FIELD: oil and gas industry.
SUBSTANCE: invention relates to the method and system for separation of the hydrocarbons contained in the effluent of the polymerisation process. the method includes pressure decreasing of the ethylene flow from pressure at least 3.4MPa to maximum pressure 1.4MPa, cooling of the off-gas including monomer by heat exchange with LP ethylene flow with creation of the first condensate including part of monomer caught by the first light gas, extraction of the first condensate and first light gas, extraction of the first condensate from the first light gas, LP ethylene flow compression to pressure at least 2.4 MPa, and passage of the compressed ethylene flow to the polymerisation reactor.
EFFECT: effective extraction of the hydrocarbons from the off-gas, re-use of major part of the olefinic monomer, and re-use of inert components contained in the off-gas.
12 cl, 5 dwg
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