Spherical micro-porous silica gel and a production process...

Details Spherical micro-porous silica gel and a production process... Spherical micro-porous silica gel and a production process...

B - Operations, Transporting

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B01J 20/10 (2006.01) B01J 20/291 (2006.01) C01B 33/154 (2006.01) C01B 33/16 (2006.01)

Patent

CA 1213262

Abstract of the Disclosure A novel spherical micro-porous silica gel having a mean diameter of 3 - 20 µm, a bulk density of 0.28 - 0.41 g/cm3, a pore size of 18,000 - 100,000 and a specific surface area of 1,000 - 1,400 m2/g, useful as a packing material for gas or liquid chromatography or as a support for catalysts used in catalytic reactions, is produced by gelling an aqueous solution containing (a) SiO2 and (b) stearic acid or a mixture of stearic acid and a non-ionic surface active agent of which HLB ranges from 3.5 to 6.0 as an emulsifier which solution is dispersed as aqueous droplets in an oil phase, wherein the primary particle diameter is not larger than 6 nm and the molar ratio of SiO2 to Na2O is not larger than 5.5, with an organic acid as a gelling agent.

433775

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