Methods for controlling aluminum alkyl feed to a slurry polymerization process

US9896520B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Reinhard Kuehl · Bornheim, DE
• Rodrigo Carvajal · Bonn, DE
• Gerhardus Meier · Frankfurt, DE
• Elke Damm · Bad Vilbel, DE
• Phil Pyman · Lymm, GB

Key dates

• Filing date: Apr 28, 2015
• Grant date: Feb 20, 2018
• Expiry date: Apr 28, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/584
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.