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

1977-06-13

1978-04-18

Holler, Alan

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in two or more physically distinct zones

526 73, 526 88, 526352, C08F 202, C08F 432, C08F11002

Patent

active

040852660

ABSTRACT:
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.degree. to 200.degree. C and at a reaction pressure of 1,000 to 1,800 kg/cm.sup.2 using an initiator, sending the resulting reaction mixture from the top reaction zone to the bottom reaction zone, and further promoting the polymerization at 220.degree. to 280.degree. 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.

REFERENCES:
patent: 3178404 (1965-04-01), Vaughn, Jr. et al.
patent: 3692763 (1972-09-01), Van Saane et al.
patent: 3756996 (1973-09-01), Pugh et al.
patent: 3875128 (1975-04-01), Suzuki et al.
patent: 3923767 (1975-12-01), Kellum et al.
patent: 3963690 (1976-06-01), Pruitt et al.

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