Optimized method for the production of catalyst supports based on silica gel and chromium catalysts supported on silica gel

US6645900B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Paulus De Lange · Wesseling, DE
• Guido Funk · Worms, DE
• Andreas Deckers · Flomborn, DE
• Peter Kölle · Bad Dürkheim, DE

Key dates

• Filing date: Feb 28, 2002
• Grant date: Nov 11, 2003
• Expiry date: Feb 28, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J37/036
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a catalyst support and to a method for the production of the catalyst support comprising the following steps:a) production of a silicic acid hydrogel having a solids content of from 10 to 25% by weight (calculated as SiO2) whose particles are substantially spherical,b) extraction of the hydrogel particles with an alcohol until at least 60% of the water present in the hydrogel has been removed,c) drying of the resultant hydrogel until the residual alcohol content is less than 10% by weight (xerogel formation) at temperatures of ≧160° C. at atmospheric pressure using an inert entraining gas,d) setting of the desired particle size of the resultant xerogel,in which the hydrogel particles have a particle size of ≧8 mm before the extraction, and to a catalyst and to a method for the production of the catalyst by loading the catalyst support with a chromium compound. The invention also relates to a method for the production of polyolefins using the catalyst.