Crystalline silica

Details Crystalline silica Crystalline silica

C - Chemistry, Metallurgy

01

B

182/12, 23/191,

C01B 33/16 (2006.01)

Patent

CA 1109639

ABSTRACT OF THE DISCLOSURE 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. - 1 -

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