FIELD: chemistry.
SUBSTANCE: method comprises: light gas stream separation from the polymerization product stream, at that, the said light gas stream comprises unreacted ethylene; light gas stream contacting with the absorbing solvent system, this contacting light gas stream with the absorbent solvent system is performed at a temperature in the range of 4°C (40°F) to 43°C (110°F). At least a part of the unreacted ethylene from the light gas stream is absorbed by the absorbent solvent system; and unreacted ethylene is recovered from the absorbent solvent system to obtain the recovered ethylene. The absorbent solvent system comprises copper chloride, aniline and N-methylpyrrolidone. The invention also relates to a process for preparation of polyethylene and three versions of the polyethylene production system.
EFFECT: invention enables high efficiency of ethylene separation from the recycling stream.
34 cl, 10 dwg, 3 tbl, 41 ex
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