Method of ethylene polymerization for producing products...

Details Method of ethylene polymerization for producing products... Method of ethylene polymerization for producing products...

2005-11-02

2008-10-14

Teskin, Fred M (Department: 1796)

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

Synthetic resins

Polymerizing in tubular or loop reactor

C526S086000, C526S087000, C526S918000, C422S134000

Reexamination Certificate

active

07435784

ABSTRACT:
A method for continuous ethylene polymerization under high pressure using a polymerization reaction zone comprises a primary reaction zone and a secondary reaction zone wherein the secondary reaction zone has a length of 1.5-6.5 times the length of the primary reaction zone and a cross-sectional area of 1.2-4 times the cross-sectional area of the primary reaction zone. Ethylene is fed continuously into the primary reaction zone at the starting point of the primary reaction zone. Low temperature initiator alone, or an initiator mixture containing mainly low temperature initiator is introduced into the primary reaction zone at the starting point of the primary reaction zone. Initiator alone or an initiator mixture is introduced into the secondary reaction zone at two or more different points of the secondary reaction zone. Ethylene polymer products of various physical properties are produced with high productivity, while the pressure drop is minimized.

REFERENCES:
patent: 3503949 (1970-03-01), Gaspari
patent: 3628918 (1971-12-01), Beals et al.
patent: 4177240 (1979-12-01), Dal Bianco

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