Patent ID: 6677408
Filing Date: 2004-01-13
Classification: B01F,B01J,C08F

Abstract:
A method for producing ethylene homo- and copolymers in a tubular reactor at pressures above 1000 bar and temperatures in the range from 120 to 350Â° C. by free-radical polymerization, which comprises adding a free-radical chain initiator to a mobile flow medium comprising ethylene, molecular weight regulator and optionally polyethylene, and the polymerization is then carried out, and the mobile flow medium is firstly split into two volume elements flowing separately from one another, in that the volume elements flowing separately from one another are then set in rotation in opposite directions by means of flow elements, in that the flowing volume elements rotating in opposite directions are then recombined to form a mobile flow medium, and in that, at the moment of or shortly after the combining of the flowing volume elements rotating in opposite directions, the free-radical chain initiator is fed into the sheared interfacial region between the flowing volume units rotating in opposite directions.