Kontinuierliches Gasphasenpolymerisationsverfahren mit Verbesserter Bedienbarkeit

Details

Veröffentlichungs-Nr.

EP4635993

Aktenzeichen

EP24170641

Anmeldetag

16. April 2024

Veröffentlichung

3. Dezember 2025

Rechtsraum

EP

IPC

C08F210/16C08F4/24C08F2/34C08F2/01

Abstract

A process for the preparation of an ethylene polymer comprising polymerizing ethylene or copolymerizing ethylene and one or more other olefins in the presence of a Phillips-type chromium catalyst in a gas-phase polymerization reactor containing a reactor bed of particulate polymer, which gas-phase polymerization reactor is equipped with a cycle gas line for withdrawing reactor gas from the reactor, leading the reactor gas through a heat-exchanger for cooling and feeding the reactor gas back to the reactor, wherein the reactor gas returned to the polymerization reactor through the cycle gas line has been partly condensed and the amount of liquid in the reactor gas returned to the polymerization reactor is from 3.5 wt.% to 10 wt.% and a multicomponent catalyst retarding agent is fed in an amount in the range of from 0.05 ppm to 2.0 ppm by weight of dosed ethylene, the catalyst retarding agent comprising at least a first component and a second component, wherein the first component and the second component are different from one another.

Anmelder

Firma

Basell Polyolefine GmbH

Land

🇩🇪 Deutschland

Fachgebiete