Olefin polymerization reaction unit and polyolefin...

Details Olefin polymerization reaction unit and polyolefin... Olefin polymerization reaction unit and polyolefin...

2008-12-10

2011-10-04

Griffin, Walter (Department: 1774)

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

Synthetic resins

Polymerizing in two or more physically distinct zones

C208S049000, C422S132000, C422S134000, C422S139000, C422S144000, C422S145000

Reexamination Certificate

active

08030420

ABSTRACT:
An olefin polymerization reaction unit includes a multistage gas phase polymerization reactor which is divided into two or more polymerization stages, in which polyolefin particles move from an initial stage to a final stage, and in which an olefin monomer-containing gas is fed from the final stage toward the initial stage. The reaction unit also includes first circulating means for feeding to the final stage a gas that is discharged from the initial stage and then cooled with a first heat exchanger, and second circulating means for feeding to one of the polymerization stages a condensate formed by condensing, with a second heat exchanger different from the first heat exchanger, a gas removed from one of the polymerization stages.

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