A process for the continuous gas-phase (co)polymerization of one or more olefins
for which a rising stream of a gas mixture, comprising at least one olefin to be
(co)polymerized, maintains polymer particles in the course of formation in the
fluidized state in a polymerization reactor, the said stream entraining fine particles
above the fluidized bed outside the reactor, the said fine particles being substantially
separated from the gas mixture using a separator, thus dividing the said stream
into (i) one or more gas streams (A) substantially devoid of solid particles which
is cooled and reintroduced below and/or into the bottom part of the fluidized bed,
and (ii) one or more gas streams (B) comprising at least a portion of the said
particles which is introduced into or above the fluidized bed, which process is
characterized in that at least one of the gas streams (B) comprising the solid
particles is introduced directly into the fluidized bed by a dilute-phase transport
in a simple pipe, that is to say preferably without using equipment for setting
in motion.
