Process for the high pressure production of polyethylene

Details Process for the high pressure production of polyethylene Process for the high pressure production of polyethylene

C - Chemistry, Metallurgy

08

F

402/509, 402/517

C08F 10/02 (2006.01) B01J 3/04 (2006.01) C08F 2/00 (2006.01) C08F 110/02 (2006.01)

Patent

CA 1065544

PROCESS FOR THE HIGH PRESSURE PRODUCTION OF POLYETHYLENE ABSTRACT OF THE DISCLOSURE In a process for polymerizing ethylene in a two-zone autoclave reactor comprising a top reaction zone and a bottom reaction zone which process comprises polymerizing ethylene in said top reaction zone at 130° to 200°C and at a reaction pressure of 1,000 to 1,800 kg/cm2 using an initiator, sending the resulting reaction mixture from the top reaction zone to the bottom reaction zone, and further promoting the poly- merization at 220° to 280°C using an initiator which is same as or different from the initiator in the top reaction zone, the improvement which comprises feeding 75 % or more of the ethylene to the top reaction zone of the two-zone reactor, said two-zone reactor being constructed so that the volume ratio of top reaction zone to bottom reaction zone is 1.5 to 6 and being provided with two or more feed inlets for each of the ethylene and the initiator in the top reaction zone in the direction extending through the two reaction zones.

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