Method of preparing a propanol sol of silica

Details Method of preparing a propanol sol of silica Method of preparing a propanol sol of silica

1996-03-15

1999-05-11

Lovering, Richard D.

Colloid systems and wetting agents; subcombinations thereof; pro

Continuous liquid or supercritical phase: colloid systems;...

Primarily organic continuous liquid phase

516928, 10628716, C01B33/18

Patent

active

059022264

ABSTRACT:
A propanol sol of silica having a specific surface area of 25 to 550 m.sup.2 /g, the sol having an SiO.sub.2 concentration of 10 to 50% by weight of SiO.sub.2 and a residual content of a medium containing 7.5% by weight or less of water based on the SiO.sub.2 content and 90% by weight or more of propanol, is prepared by an improved process involving replacing the aqueous medium in an acidic aqueous sol of silica containing 5 to 50% by weight of SiO.sub.2 and a medium having a water content of 15% by weight or more with propanol by an atmospheric distillation method in which a concentration of 5 to 50% by weight of SiO.sub.2 in the sol and 1 to 85% by weight of methanol in the medium in the sol is maintained when the medium in the sol during the replacement contains 15 to 0.5% by weight of water.

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Industrial Solvents Handbook, Second Edition, Edited by Ibert Mellan (Noyes Data Corp., Parkridge NJ, 1977**) pp. 174-176, 181, 188-189, 191, 193, & 489**.

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