Process for producing xerogel of silicic acid with high volume o

Details Process for producing xerogel of silicic acid with high volume o Process for producing xerogel of silicic acid with high volume o

1981-12-28

1983-05-03

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

252451, C01B 3316

Patent

active

043820700

ABSTRACT:
The product of this invention can be applied as a column packing for high performance liquid chromatography. This material is further useful as a catalyst carrier, as a sorbent for selective concentrating diluted compounds for analytical purposes, and for immobilizing enzymes and the like. The invention discloses a process for producing silicic acid xerogel matrix with a volume of pores up to 4.0 cm.sup.3 g.sup.-1 or even more, which process consists in that the starting soft and elastic silica hydrogel is subjected to combined effect of successive hardening in concentrated solutions of strong inorganic or organic acids, such as, for example, sulphuric acid, hydrochloric, phosphoric, nitric or trichloroacetic acids at ambient or elevated temperatures followed by acting in water-miscible solvents, such as, for example, in alcohols or ketones, and finally, by acting in water-immiscible solvents, such as, for example, in benzene, toluene, C.sub.5 to C.sub.12 hydrocarbons or carbon tetrachloride.

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patent: 3959174 (1976-05-01), Winyall et al.
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patent: 4089932 (1978-05-01), Morita et al.
patent: 4169926 (1979-10-01), McDaniel
patent: 4206297 (1980-06-01), Hoff et al.
patent: 4246139 (1981-01-01), Witt
patent: 4301034 (1981-11-01), McDaniel

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