Mouldings based on pyrogenic silicon dioxide

Details Mouldings based on pyrogenic silicon dioxide Mouldings based on pyrogenic silicon dioxide

C - Chemistry, Metallurgy

04

B

C04B 35/14 (2006.01) B01J 21/06 (2006.01) B01J 21/08 (2006.01) B01J 23/54 (2006.01) B01J 32/00 (2006.01) B01J 35/10 (2006.01) B01J 37/00 (2006.01) C07C 29/04 (2006.01) C07C 31/08 (2006.01) C07C 31/10 (2006.01) C07C 41/06 (2006.01) C07C 43/06 (2006.01) C07C 67/055 (2006.01) C07C 69/15 (2006.01)

Patent

CA 2253952

Mouldings based on pyrogenic silicon dioxide with a pore volume of 0.5 to 1.8 ml/g are prepared by homogenising pyrogenic silicon dioxide with methylhydroxyethyl cellulose, wax and polyethylene glycol with the addition of water, which then is subject to a compounding and shaping process, and is extruded. The extrudant is dried at a temperature of 70 to 150°C, and conditioned for a period of 30 minutes to 10 hours at a temperature of 400 to 1200°C. These mouldings may be used as catalysts or as catalyst supports, for the preparation of vinyl acetate monomer, the hydration of ethylene and the hydration of propylene.

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