Silica gel manufactured by a hydrothermal polymerization followi

Details Silica gel manufactured by a hydrothermal polymerization followi Silica gel manufactured by a hydrothermal polymerization followi

1993-12-09

1995-01-10

Chaudhuri, Olik

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

2523156, 502233, C01B 3314

Patent

active

053805100

ABSTRACT:
This invention provides a method for manufacturing silica gels in a form of scales or needles having a pore volume and a specific surface area being relatively large and being controlled. Silicic acid sol is frozen, crystallized and deposited in gaps among crystal faces of crystals of solvent of the sol, thus obtaining the frozen silica hydrogels in the form of scales or needles. After unfreezing the frozen silica hydrogels, a hydrothermal polymerization is carried out. Subsequently, the silica hydrogels are dried, thus obtaining the silica gels in the form of scales or needles. Furthermore in the invention, by controlling the gelation time period of silica sol, the silica gels with their configuration controlled can result from even inexpensive silica sol. The invention has the advantage that a freeze-drying step is not required: just through freezing, unfreezing, washing and hydrothermal polymerization steps, the physical properties of the silica gels can be controlled.

REFERENCES:
patent: 2561304 (1951-07-01), Hazel
patent: 3681017 (1972-08-01), Butcher et al.
patent: 4230679 (1980-10-01), Mahler et al.
Hench et al., "Sol-Gel Process", Chem Rev., vol. 90 No. 1, Jan 1990, pp. 33-72.

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