Patent ID: 7414098
Filing Date: 2008-08-19
Classification: B01J,C08F,Y10S

Abstract:
1. A process for a gas-phase catalytic polymerization of olefins carried out in a plurality of interconnected polymerization zones, the process comprising feeding at least one monomer to said polymerization zones in the presence of a catalyst under reaction conditions and collecting the polymer product from said polymerization zones, wherein polymer particles grow within a first polymerization zone where a fluidized bed is formed, and at least a part of said polymer particles leave said first polymerization zone to enter a second polymerization zone through which they flow downward, leave said second polymerization zone and enter a third polymerization zone through which they flow upward under fast fluidization or transport conditions, leave said third polymerization zone and are reintroduced into the first polymerization zone, thus establishing a circulation of polymer between the different polymerization zones.