Process for the preparation of silica spheres

Details Process for the preparation of silica spheres Process for the preparation of silica spheres

C - Chemistry, Metallurgy

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B

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C01B 33/152 (2006.01) B01J 21/08 (2006.01) C01B 33/154 (2006.01)

Patent

CA 1259473

A B S T R A C T PROCESS FOR THE PREPARATION OF SILICA SPHERES Silica spheres are prepared in a process comprising: a) preparing a silica hydrosol by mixing an aqueous solution of an alkali metal silicate with an aqueous solution of an acid; b) converting the hydrosol into droplet form; c) ageing the droplets in a fluid to produce hydrogel particles; d) partially drying the hydrogel particles at 10 to 60 °C in air having a relative humidity in the range of from 45 to 95%, to a water content in the range of from 0.3 to 1.3 kg/kg solids; e) decreasing the cation content of the hydrogel particles by ion-exchange in an aqueous medium to less than 10 %w, calculated on dry material; and f) finally drying the hydrogel particles to obtain silica spheres.

486580

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