METHOD OF SYNTHESIS OF ETHYLENE HOMOPOLYMERS AND COPOLYMERS OF ETHYLENE WITH VINYL ACETATE Russian patent published in 2000 - IPC

FIELD: organic chemistry, chemical technology. SUBSTANCE: process of (co)polymerization is carried out under pressure 1 400-3 000 atm, at flow rate of reaction mass 5-10 m/s using periodic drops of pressure in reactor: drop value pressure in beginning of reactor is 70-150 atm, period between drops is 100-200 s in the presence of homogenizing hydrocarbon addition. Addition is branched acyclic compounds of paraffin order at medium-measured molecular mass M 300-3 000 Da and 230-400 CH₃-groups per 1 000 hydrocarbon atoms at mass ratio to homogenizing addition = (1:0.0003)-(1:0.002). Process of (co)polymerization at beginning of a single-zone reactor or at beginning of the first zone of multi-zone reactor is carried out at 160-200 C and at the next sites of a single-zone or multi-zone reactors process is carried out at 200-320 C and value of specific heat loading for reactor zone site at 160-200 C is maintained at the range 30 000-50 000 kkal/m² x h. Method provides the necessary stability of the process of synthesis of (co)polymers that ensures to diminish the length of tube reactor up to 225-300 m. Invention can be used in chemical and petrochemical industry. EFFECT: improved method of synthesis, decreased material consumptions. 2 cl, 1 tbl