Patent ID: 6911504

Claim:
A process for the continuous gas-phase (co)polymerization of one or more olefins comprising continuously (co)polymerizing one or more olefins in the gas-phase in a fluidized bed, polymerization reactor in which a rising stream of a gas mixture, containing at least one olefin to be (co)polymerized, maintains polymer particles in the course of formation in the fluidized state in the polymerization reactor, the stream entraining fine particles above the fluidized bed, substantially separating the fine particles in the stream from the gas mixture in a separator, dividing the stream into (i) one or more gas streams (A) substantially devoid of the particles which is cooled and reintroduced below and/or into a bottom part of the fluidized bed, and (ii) one or more gas streams (B) containing at least a portion of the particles which is introduced into or above the fluidized bed, wherein at least one of the gas streams (B) containing the particles is introduced directly into the fluidized bed by a dilute-phase transport in a pipe without using any equipment for setting in motion the at least one of the gas streams (B) containing the particles in the pipe.