Degussa Aktiengesellschaft

Degussa - Huls Ag

Oliver Feuer

Peter Panster

Thomas Tacke

Helmfried Krause

Lukas M Von Hippel

Hans Christian Alt

Rudiger Schutte

Manfred Sauer

Hermanus Gerhardus Lansink Rotgerink

Catrin Becker-Balfanz

Jurgen Lorosch

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

A process for the direct preparation of alkali metal cyanide and alkaline earth metal cyanide granules from an HCN-containing gas and an aqueous solution or suspension of an alkali metal or alkaline earth metal hydroxide. The reaction is performed in a reactor for fluidized bed spray granulation, wherein a solution or suspension of the hydroxide is sprayed onto seed granules of the cyanide being prepared and at the same time a hydrogen cyanide-containing gas is supplied to the reactor and water is evaporated by means of a fluidizing gas. The preferred fluidizing gas is steam. The reaction gases from a BMA or Andrussow process may be quenched with water and the gas mixture used as fluidizing gas. By using a CO.sub.2 -free HCN-containing gas, alkali metal cyanide granules with advantageous properties, including a combined concentration of alkali metal carbonate and alkali metal formate of less then 0.4 wt. %, are obtainable.

Process for preparing alkali metal cyanide and alkaline earth metal

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Nidderau, Germany

Oliver Feuer