Polyethylene processes and compositions thereof

US9023945B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Harilaos Mavridis · Lebanon, US
• Gerhardus Meier · Frankfurt, DE
• Ulf Schueller · Weiterstadt, DE
• Diana Doetsch · Mainz, DE
• Bernd Lothar Marczinke · Frankfurt, DE
• Iakovos Vittorias · Mainz, DE

Key dates

• Filing date: Feb 26, 2014
• Grant date: May 5, 2015
• Expiry date: Feb 26, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/905
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Embodiments of the present disclosure relate to a method of preparing polyethylene compositions comprising polymerizing ethylene in a first gas-phase reactor and polymerizing ethylene in a second gas-phase reactor in the presence of hydrogen; wherein at least one of the first or second gas-phase reactors comprises a first and second polymerization zone; wherein a hydrogen pressure of the first and second polymerization zones are different such that at least a portion of the second ethylene cycles through the first and second polymerization zones and a gas mixture of each polymerization zone is partially or totally prevented from entering the other zone.