Crystalline silica

Details Crystalline silica Crystalline silica

1975-09-22

1977-12-06

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423339, C01B 3312

Patent

active

040617246

ABSTRACT:
A novel crystalline silica composition having uniform pore dimensions of approximately 6 Angstrom units is prepared by calcining a crystalline hydrated alkylonium silicate prepared hydrothermally from a reaction mixture containing as essential reagents, water, amorphous silica and a quaternary ammonium compound at a pH of at least 10. The crystalline silica, because of its uniform pore structure, is capable of making size-selective separations of molecular species, but neither it nor its silicate precursor exhibit ion-exchange properties.
This absorbent has a very useful hydrophobic/organophilic characteristic which permits its use in selectively adsorbing organic materials from water, either in liquid or vapor phase.

REFERENCES:
patent: 3556725 (1971-01-01), Chiola et al.
Merrill et al., "J. Phys. Chem.," 55, 187, (1951).

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