Gas-phase polymerization of C2-C8-alk-1-enes

US6521722B1 · kind B1 · utility

Assignee

• Basell Polypropylen GmbH · DE

Inventors

• Wolfgang Bidell · Mutterstadt, DE
• Roland Hingmann · Ladenburg, DE
• Franz Langhauser · Bad Dürkheim, DE
• Meinolf Kersting · Neustadt, DE
• Rainer A. Werner · Annaberg-Buchholz, DE

Key dates

• Filing date: Mar 14, 2000
• Grant date: Feb 18, 2003
• Expiry date: Mar 14, 2020

Classification

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

Abstract

In a process for the polymerization of C2-C8-alk-1-enes by means of a Ziegler-Natta catalyst system, in which polymerization is carried out from the gas phase in at least one reaction zone at from 40 to 120° C. and pressures of from 1 to 100 bar, the pressure and temperature in the reaction zone are set so that an operating point formed by these parameters in a pressure-temperature diagram is located at from 0.2 to 5.0 bar below the dew line of the respective reaction mixture above which condensation of the C2-C8-alk-1-enes occurs.