Discontinuous metering of catalysts and process auxilliaries into a gas-phase fluidized-bed reactor

US7534341B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Rainer Karer · Kaiserslautern, DE
• Kaspar Evertz · Schifferstadt, DE
• Peter Kölle · Bad Dürkheim, DE
• Hans-Jacob Feindt · Flemington, US

Key dates

• Filing date: Apr 15, 2004
• Grant date: May 19, 2009
• Expiry date: Jan 12, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F210/16
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Method of metering at least one solid, particulate catalyst into a reactor containing a fluidized bed (11) of particles in an at least partly gaseous medium, in which the catalyst is metered discontinuously at prescribed time intervals into the fluidized bed (11) at at least one metering point (10). According to the present invention, a fluid stream is firstly introduced into the reactor (5) so that a region having a reduced particle density is formed in the fluidized bed (11) around the metering point (10) and the catalyst is subsequently metered into this region. As a result of the prior introduction of a fluid stream (“preblowing”) before the actual introduction of the catalyst, the catalyst can penetrate significantly deeper into the fluidized bed from the metering point due to the reduced particle density and is dispersed better.