公开(公告)号：US20170183427A1

公开(公告)日：2017-06-29

申请号：US15305047

申请日：2015-04-28

Applicant: Basell Polyolefine GmbH

Inventor： Reinhard Kuehl ,  Rodrigo Carvajal ,  Gerhardus Meier ,  Elke Damm ,  Phil Pyman

IPC: C08F10/02

CPC classification number: C08F10/02 ,  C08F2400/02 ,  Y02P20/584 ,  C08F2/14 ,  C08F2/001

Abstract: The present disclosure generally relates to a slurry polymerization process for the preparation of polyethylene in the presence of a Ziegler catalyst and aluminum alkyl co-catalyst in at least one polymerization reactor, in which process suspension medium comprising a concentration of aluminum alkyl co-catalyst is recycled to the polymerization, the concentration of aluminum alkyl co-catalyst in the recycled suspension medium is determined; and the amount of fresh aluminum alkyl co-catalyst fed to the polymerization is adjusted to maintain a targeted aluminum alkyl co-catalyst concentration in the recycled suspension medium.