Moldings including pyrogenic mixed oxide and the use thereof

US6432869B1 · kind B1 · utility

Assignee

• Degussa AG · DE

Inventors

• Helmfried Krause · Rodenbach, DE
• Hermanus Gerhardus Jozef Lansink Rotgerink · Goldbach, DE
• Thomas Tacke · Friedrichsdorf, DE
• Helmut Mangold · Rodenbach, DE
• Heike Riedemann · Mömbris, DE
• Manfred Fuchs · Nuremberg, DE

Key dates

• Filing date: Sep 22, 1999
• Grant date: Aug 13, 2002
• Expiry date: Sep 22, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J35/638
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Moldings are disclosed for use as a catalyst or catalyst support for hydrating olefin, such as ethylene and propylene. The moldings are based on a pyrogenically produced mixed oxide having the following physicochemical parameters:External diameter0.8-25 mmBET surface area5-400 m2/gPore volume0.2-1.8 ml/gFracture strength5 to 350 NCompositionAt least two materials selected from the group of SiO2,Al2O3, TiO2 and ZrO2 in any desired combination,with the proviso that when the combination is aSiO2/Al2O3 mixed oxide, at least 75 wt. % of SiO2 is present based on the total weight of the mixed oxide.Other constituents<1 wt. %Bulk density250-1500 g/l.The moldings are produced by homogenizing pyrogenically produced mixed oxide as desired with water and one or more compounds selected from the group of methylcellulose, methylhydroxyethylcellulose, wax, polyethylene glycol, magnesium stearate or aluminium stearate; drying the product at a temperature of 70-150&deg; C.; optionally comminuting to yield a powder; optionally compression molding the powder to yield moldings; and performing heat treatment for a period of 0.5 to 10 hours at a temperature of 400 to 1200&deg; C. Prior to drying, the mix…