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US Patent 8198383 Process for the gas-phase polymerization of olefins

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Patent
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Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
8198383
Date of Patent
June 12, 2012
Patent Application Number
12735090
Date Filed
December 17, 2008
Patent Citations Received
‌
US Patent 12103988 Gas-phase process for preparing ethylene polymers
3
Patent Primary Examiner
‌
William Cheung
Patent abstract

A process for the gas-phase polymerization of α-olefins carried out in two interconnected polymerization zones, wherein the growing polymer particles flow through the first of said polymerization zones (riser) under fast fluidization conditions, leave said riser and enter the second of said polymerization zones (downcomer) through which they flow downward in a densified form, the process being characterized in that: (a) the gas mixture present in the riser is totally or partially prevented from entering the downcomer by introducing into the upper part of said downcomer a liquid stream LB having a composition different from the gaseous mixture present in the riser; (b) the ratio R between the flow rate Fp of polymer circulated between said downcomer and said riser and the flow rate LB of said liquid being adjusted in a range from 10 to 50.

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