C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
196/133, 260/369
C01B 33/16 (2006.01) B01J 2/08 (2006.01) B01J 21/08 (2006.01) B01J 23/84 (2006.01) B01J 35/08 (2006.01) C01B 33/154 (2006.01) C07D 301/03 (2006.01) C07D 301/19 (2006.01) C10G 45/08 (2006.01)
Patent
CA 1064008
ABSTRACT It is known to prepare silica particles by the known sol-gel method. However silica particles prepared by the known method have a lower bulk crush strength and a lower water resistivity than desired. These properties of silica particles may be improved by the present invention which provides a process for the preparation of globular silica particles having a water resistivity of at least 80% and a bulk crushing strength of at least 12 kg/cm2, which process comprises the following successive steps: a) preparing a silica hydrosol by mixing an aqueous solution of an alkalimetal silicate wit an aqueous solution of an acid, b) converting the hydrosol into droplet form, c) gelling the droplets in a liquid which is not miscible with water, d) removing at least 25% of the amount of water present in the hydrogel particles by evaporation, e) decreasing the alkali- metal content of the hydrogel particles in an aqueous medium to less than 1% w calculated on dry material, and f) drying and calcining the globular silica particles. The so prepared silica particles are useful as catalysts, catalyst carriers, adsorbants, drying agents and ion exchangers.
236978
Van Beem Martinus J.l.
Wagstaff Nigel
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