Patent ID: 9296834
Filing Date: 2016-03-29
CPC Classification: B01J,C08F

Claim Text:
1. A process for preparing polyolefin in a polymerization loop reactor, said polymerization loop reactor comprising: a plurality of interconnected pipes defining a flow path for a polyolefin slurry, and one or more settling legs provided on at least one horizontal part of said interconnected pipes, said process comprising: feeding olefin monomer, liquid diluent, polymerization catalyst, optionally hydrogen, and optionally olefin co-monomer into said polymerization loop reactor; and polymerizing said olefin monomer and optionally said olefin co-monomer to produce said polyolefin slurry in said polymerization loop reactor; wherein a circulation velocity of the polyolefin slurry inside the at least one horizontal part of said interconnected pipes provided with one or more settling legs is reduced by at least 20% and at most 60% compared to a circulation velocity inside a remainder of said polymerization loop reactor.