Process for preparing a product of polyethylene in a loop reactor polymerization

摘要

Process for preparing a polyolefin in a loop reactor polymerization, said reactor comprising looped: - a plurality of interconnected pipes defining a flow path for a suspension of polyolefin, and - one or more settling legs provided on at least one horizontal part of said interconnected pipes, said method comprising the steps of: - feeding the olefin monomer, liquid diluent, the polymerization catalyst, optionally hydrogen and optionally an olefin comonomer to said loop reactor; and - polymerizing said monomer and optionally olefin comonomer to produce said suspension in said polyolefin loop reactor; wherein the flow rate of the suspension of polyolefin within 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 with the circulation velocity inside the remainder of said loop reactor.