C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/375, 23/379
C08F 2/34 (2006.01) B01J 8/00 (2006.01) B01J 8/08 (2006.01) B01J 8/24 (2006.01) B01J 19/18 (2006.01) C08F 10/00 (2006.01)
Patent
CA 2037175
ABSTRACT OF THE DISCLOSURE PROCESS AND DEVICE FOR THE GAS PHASE POLYMERIZATION OF ALPHA-OLEFINS The present invention relates to a process and a device for polymerizing alpha-olefins such as ethylene or propylene in a gas phase. The device comprises a gas phase polymerization reactor (5) into which a suspension of prepolymer particles in liquid saturated hydrocarbon(s) is continuously introduced. The prepolymer suspension is prepared in one or more prepolymerization vessels (14) and is continuously passed to a post-treatment unit comprising a degassing means (10) wherein most of the dissolved unreacted olefinic monomer(s) is separated. Preferably, the post-treatment unit may comprise a particle separation means (11) for removing the finest and/or coarsest prepolymer particles from the suspension and/or a concentration means (11a) for concentrating the suspension. High activity catalyst can be used in the process with reduced amounts of prepolymer agglomerates. Prepolymer can be obtained with a constant quality and a desired size.
Brule Daniel
Iffly Jean-Marie
Raufast Charles
Bp Chemicals Limited
Fetherstonhaugh & Co.
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