Continuous gas-phase polymerization process

US6180729A · kind A · utility

Assignee

• BASF SE

Inventors

• Armin Lange · Heidelberg, DE
• Wolfgang Micklitz · Neustadt, DE
• Rainer Karer · Kaiserslautern, DE
• Kaspar Evertz · Schifferstadt, DE
• Shahram Mihan · Bad Soden, DE
• Hans-Jacob Feindt · Flemington, US
• Manfred Hecker · Linz, DE
• Peter Bauer · Ludwigshafen, DE
• Philipp Rosendorfer · Neustadt, DE

Key dates

• Filing date: Nov 30, 1998
• Grant date: Jan 30, 2001
• Expiry date: Nov 30, 2018

Classification

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

Abstract

In a continuous gas-phase polymerization process for preparing ethylene and propene homopolymers and copolymers, in which ethylene, propene or a mixture of ethylene or propene and C.sub.3 -C.sub.8 -.alpha.-monoolefins is polymerized in the polymerization zone of a gas-phase polymerization reactor at from 30 to 125.degree. C. and a pressure of from 1 to 100 bar in the gas phase in a bed of finely divided polymer in the presence of a catalyst, where the reactor gas is circulated to remove the heat of polymerization, polymer deposits in the circulating gas line are prevented by metering a catalyst poison having a boiling point above the maximum temperature within the circulating gas line into this circulating gas line in at most such an amount that it does not significantly impair the productivity of the catalyst in the reactor.