Microporous membrane process for making concentrated silica sols

Details Microporous membrane process for making concentrated silica sols Microporous membrane process for making concentrated silica sols

1973-07-02

1976-07-13

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

252314, 252317, B01J 1300

Patent

active

039692663

ABSTRACT:
Aqueous silica sols having a pH from 8 to 11 containing 1 to 40% by weight of colloidal silica and soluble salts can be purified and concentrated by filtering the soluble salt from the sol using a microporous membrane filter while maintaining the salt concentration within a range determined by the concentration of silica in the sol. In one embodiment, colloidal silica particles are grown to a larger size by starting with a sol of nuclei, and adding sodium silicate solution and acid.

REFERENCES:
patent: 2572578 (1951-10-01), Trail
patent: 2668149 (1954-02-01), Iler
patent: 3560400 (1971-02-01), Chilton
patent: 3582494 (1971-06-01), Vossos et al.

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