Apparatus for continuous polymerization of olefin, method...

Details Apparatus for continuous polymerization of olefin, method... Apparatus for continuous polymerization of olefin, method...

2005-07-14

2008-12-16

Teskin, Fred M (Department: 1796)

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

Synthetic resins

Polymerizing in two or more physically distinct zones

C526S088000, C526S920000, C422S134000, C034S582000, C034S583000

Reexamination Certificate

active

07465772

ABSTRACT:
An apparatus and method for continuous polymerization of olefin(s), and a method for transferring a polymer powder from one reactor to another in the apparatus are disclosed. The apparatus includes a plurality of serially disposed gas-phase polymerization reactors including a combination of an upstream and downstream reactors and a gas exchange vessel disposed between both reactors. The gas exchange vessel is connected to the upstream and downstream reactors by a first and second transfer conduits, respectively. The gas exchange vessel has a gas distributor plate therein which partitions the gas exchange vessel into an upper section having a gas exchange chamber and a lower section. In the gas exchange chamber, the gas transferred from the upstream reactor together with a polymer powder is exchange at least partly with fresh gas introduced through the gas distributor plate via the lower section. The polymer powder is then transferred to the downstream reactor.

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Derwent Abstract Accession No. 2000-232972/20, A35 (corresponds to JP2000-053707 which was previously submitted on Jul. 14, 2005).
Patent Abstracts of Japan, Publication No. 2003-277412 A, published Oct. 2, 2003.

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