Degussa Aktiengesellschaft

Degussa - Huls Ag

Hermanus Gerhardus Lansink Rotgerink

Thomas Tacke

Peter Panster

Helmfried Krause

Ralf Karch

Christoph Batz-Sohn

Roland Burmeister

Steffen Seebald

Matthias Prinz

Oliver Feuer

Helmfried Kraus

Peter Schinke

Thomas Krauter

Moldings based on pyrogenic silicon dioxide with a pore volume of 0.5 to 1.8 ml/g are prepared by homogenizing pyrogenic silicon dioxide with methylhydroxyethyl cellulose, wax and polyethylene glycol with the addition of water, subjecting this mixture to a compounding and shaping process, extruding, optionally cutting the extrudate to the desired length using a cutting device, drying at a temperature of 70&deg; to 150&deg; C. and conditioning for a period of 30 minutes to 10 hours at a temperature of 400&deg; to 1200&deg; C. The moldings may be used as catalysts or catalyst supports for the preparation of vinyl acetate monomer, the hydration of ethylene and the hydration of propylene.

Moldings based on pyrogenic silicon dioxide

Moldings based on silica having a hollow cylindrical configuration with internal reinforcing stays or spokes leading from an inner wall of a hollow cylinder to the center of the molding or in the form of miniliths having passageway channels therethrough, are produced by homogenizing silica with methyl hydroxyethyl cellulose, wax and/or polyethylene glycol. Water and optionally aqueous alkaline ammonia solution are added, and the mixture is subjected to kneading and forming, extruding, optionally cutting the extrudate to the desired length by means of a cutting device, drying at a temperature from 20 to 150&deg; C., and annealing for a period from 30 minutes to 10 hours at a temperature of 400 to 1200&deg; C. The moldings can be used as catalyst supports for the production of unsaturated esters from olefins, organic acids and oxygen in the gas phase and and can be used in particular for the production of vinyl acetate monomer.

Moldings based on silica

Compacts based on pyrogenically produced silicon dioxide

A method for the production of organosilanes functionalized in 3-position by reacting suitable allyl compounds with hydrogen silanes in the presence of a multielement catalyst containing platinum and at least one other element.

Method of producing propylsilanes

Growing community of inventors

Mombris-Mensengesass, Germany

Hermanus Gerhardus Lansink Rotgerink