Process for the catalytic polymerization of olefins, a reactor system, its use in the process, the polyolefins obtained and their use

US7781545B2 · kind B2 · utility

Assignee

• Borealis Technology Oy · FI

Inventors

• Gunter Weickert · Ahaus, DE
• Bill Gustafsson · Stenungsund, SE

Key dates

• Filing date: May 11, 2004
• Grant date: Aug 24, 2010
• Expiry date: Jun 27, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/918
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the catalytic polymerization of olefins comprising the steps of; i) a first polymerization in a first reactor, wherein olefins are polymerized with a particulate catalyst, hydrogen and optional a comonomer in a fluidum of an inert low boiling hydrocarbon medium into an reaction mixture comprising polymerized olefins; and ii) a second polymerization in a second reactor, wherein the polymerized olefins are further polymerized in a fluidized bed and in a moving bed under such conditions that the residence time in the fluidized bed and the residence time in the moving bed are independently controlled to a reactor system for carrying out said process, to the use of the reactor system, the polyolefins obtainable with said method and to the use of these polyolefins.