PROCESS OF POLYMERISATION OR COPOLYMERISATION OF ETHYLENE-UNSATURATED MONOMERS WITH PRESENCE OF FREE-RADICAL POLYMERISATION INITIATORS Russian patent published in 2016 - IPC C08F2/01 C08F10/00 C08F10/02 C08F4/34 C08F4/04 

FIELD: chemistry.

SUBSTANCE: invention relates to process of polymerisation or copolymerisation of ethylene-unsaturated monomers in presence of free-radical polymerisation initiators under pressure in the interval from 110 MPa to 500 MPa and temperatures in the range from 100°C to 350°C in apparatus of continuously proceeding polymerisation. Reaction gas mixture is compressed to polymerisation pressure by at least two successively operating compressors. Low-pressure compressor compresses reaction gas mixture to pressure from 10 MPa to 50 MPa. High-pressure compressor then compresses reaction gas mixture to polymerisation pressure parameter. High-pressure compressor operates with synthetic polyalkyleneglycol-based lubricating material. Oxygen is introduced into mechanism for fresh gas supply or into polymerisation installation in quantity providing oxygen content in the range 0.01-0.9 ppm in gas mixture, compressed in high-pressure compressor.

EFFECT: reduction of sediment formation in high-pressure compressor and provision of compressor operation with higher capacity with reduction of compressor vibration.

8 cl, 1 dwg, 2 ex