The present invention relates to a polymerization process for producing
olefin polymers in a loop reactor comprising two or more settling legs,
comprising the steps of: --introducing into the loop reactor one or more
olefin reactants, polymerization catalysts and diluents, and while
circulating said reactants, catalysts and diluents; --polymerizing said
one or more olefin reactants to produce a polymer slurry comprising
essentially liquid diluent and solid olefin polymer particles; said
process further comprising one or more cycles of: (a) allowing said
polymer slurry to settle into said setting legs, and (b) sequentially
discharging said settled polymer slurry from said two or more settling
legs out of the reactor, whereby the aggregate time of discharge of all
the legs is more than 50%, preferentially more than 80% and most
preferably more than 95% of the time interval between two triggerings of
the same settling leg.