Silica sol process

Details Silica sol process Silica sol process

1981-04-10

1983-10-18

Lovering, Richard D.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

252313S, B01J 1300, B01D 5702

Patent

active

044104057

ABSTRACT:
Concentrated aqueous silica sols of small silica particles about 10 nm or less in diameter and uniformly sized are prepared by a process for maintaining a constant number of silica nuclei particles prior to the deposition process. The process for maintaining a constant number of silica nuclei particles in the sol consists of forming the particles at a pH 8-10.5 and a low temperature then heating the sol through a transition temperature to a deposition temperature, maintaining the pH, removing alkali metal ions and simultaneously adding alkali metal silicate from the system at a rate such that the number of silica particles in the sol remains constant while the temperature is being raised.

REFERENCES:
patent: 2601235 (1952-06-01), Alexander et al.
patent: 3668088 (1972-06-01), Iler
patent: 3789009 (1974-01-01), Irani
patent: 4147605 (1979-04-01), Schenker et al.

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