Compacts based on pyrogenically-produced silicon dioxide

Details Compacts based on pyrogenically-produced silicon dioxide Compacts based on pyrogenically-produced silicon dioxide

B - Operations, Transporting

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B01J 21/08 (2006.01) B01J 23/52 (2006.01) B01J 32/00 (2006.01) B01J 35/10 (2006.01) B01J 37/00 (2006.01) C04B 35/14 (2006.01) C04B 35/634 (2006.01) C07C 29/05 (2006.01) C07C 31/02 (2006.01) C07C 41/06 (2006.01) C07C 43/06 (2006.01) C07C 67/035 (2006.01) C07C 67/055 (2006.01) C07C 69/15 (2006.01) C09C 1/30 (2006.01)

Patent

CA 2205416

Compacts based on pyrogenically-produced silicon dioxide and having the following physical and chemical characteristics: Outer diameter 0.8 - 20 mm BET surface area 30 - 400 m2/g Pore volume 0.5 - 1.3 ml/g Breaking strength 10 to 250 N Composition > 99.8 wt.% SiO2 Other constituents < 0.2 wt.% Abrasion < 5 wt.% Apparent weight 350 - 750 g/l. are produced by a method in which pyrogenically-produced silicon dioxide is homogenised with methyl cellulose, microwax and polyethylene glycol with addition of water, dried at a temperature of 80 - 150°C and comminuted to a powder, optionally the powder is compressed into compacts, and heat-treated at a temperature of 400 to 1200°C for a time of 0.5 to 8 hours. These compacts can be used as catalysts or catalyst carriers in vinyl acetate monomer production and ethylene hydration.

Compacts à base de dioxyde de silicium produit par pyrogénation, possédant les caractéristiques physiques et chimiques suivantes : diamètre externe, 0,8 - 20 mm; aire surfacique BET, 30 - 400 m2/g; volume poreux, 0,5 - 1,3 ml/g; résistance à la rupture, 10 à 250 N; composition, > 99.8 % en poids de SiO2; autres constituants, < 0.2 % en poids; abrasion, < 5 %; poids apparent, 350 - 750 g/l. Ces compacts sont obtenus par un procédé dans lequel du dioxyde de silicium est homogénéisé avec de la cellulose méthylique, de la microcire et du poly(éthylèneglycol), avec addition d'eau, séchage à une température de 80 - 150 degrés C, et broyage en une poudre; celle-ci est facultativement comprimée et traitée thermiquement à une température de 400 à 1200 degrés C pendant 0,5 à 8 heures. Ces compacts peuvent être employés comme véhicules catalytiques dans la production de monomère d'acétate de vinyle et dans l'hydratation de l'éthylène.

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