Production of polyethylene

Details Production of polyethylene Production of polyethylene

1974-03-29

1977-03-29

Holler, Alan

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

Synthetic resins

Polymerizing in two or more physically distinct zones

23288R, 23289, 23290, 526 67, 536 73, 526 78, 526 82, 526349, 526352, C08F 1002, C08F 1008, C08F11002, C08F21008

Patent

active

040148599

ABSTRACT:
Ethylene is polymerized or copolymerized using a pressure of at least 300 kgm/cm.sup.2 and a multi-zone (i.e. two or more) reaction vessel wherein the feed to the first zone is fresh ethylene, which is preferably mixed with recycle gas from the low pressure hopper and into at least a subsequent zone there is introduced a feed containing return gas recycled from the separator. By this technique the composition of the gas feed to the various zones can be varied, for example the hydrogen content of the gas streams to the various zones can be varied and this can produce a polymer of broader molecular weight distribution.

REFERENCES:
patent: 2882264 (1959-04-01), Barnes et al.
patent: 2953552 (1960-09-01), Stampa et al.
patent: 3073809 (1963-01-01), Kluiber et al.
patent: 3309350 (1967-03-01), Kelley et al.
patent: 3405115 (1968-10-01), Schappert et al.
patent: 3551397 (1970-12-01), Ratzsch et al.
patent: 3654254 (1972-04-01), Job et al.
patent: 3732198 (1973-05-01), Whiteley et al.

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