Patent ID: 6727326
Filing Date: 2004-04-27
Classification: B01J,C08F

Abstract:
A process for the continuous preparation of ethylene homopolymers and ethylene copolymers in the presence of free-radical polymerization initiators and in the presence or absence of molecular weight regulators in a tubular reactor having a hot water jacket and one or more reaction zones at pressures in the range from 1000 to 4000 bar and temperatures of from 120Â° C. to 350Â° C., where the hot water jacket of each reaction zone is divided into at least two independently regulatable, separate longitudinal sections, wherein the hot water outlet temperature from the jacket of the first longitudinal section of each reaction zone, which extends over the region in between the initiator addition point and from 20 to 50% of the reaction zone length, is set to from 180Â° C. to 210Â° C. and the hot water outlet temperature from the jacket in the subsequent, second longitudinal section of this reaction zone is set to from 140Â° C. to 180Â° C.