Chemical dehydroxylation of silica

Details Chemical dehydroxylation of silica Chemical dehydroxylation of silica

1980-05-21

1981-12-29

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252458, 423347, B01J 2100, B01J 2326

Patent

active

043081720

ABSTRACT:
Silica having an enhanced level of dehydration beyond what can be produced by heating alone is produced by a three step process comprising (1) chlorination, (2) dechlorination, and (c) oxidation. The resulting dehydroxylated silica is a novel composition of matter and is useful as a reinforcing agent in rubber or plastics and as a support for a chromatographic column in addition to being suitable for a catalyst support. Where the dechlorinating agent is hydrogen, a hydrophobic silica composition containing .tbd.Si--H structures and essentially no --OH groups is produced which is suitable for use as a reducing agent, a coupling agent as well as a precursor for the oxidized dehydroxylated silica described above.

REFERENCES:
patent: 3007905 (1961-11-01), Bailey
patent: 3041144 (1962-06-01), Schering
patent: 3280096 (1966-10-01), Mackenzie
patent: 3629150 (1971-12-01), Addy
patent: 3892678 (1975-07-01), Halasz et al.
patent: 3976632 (1976-08-01), Delap
patent: 3997465 (1976-12-01), Grossman et al.
Modified Silica Gels as Adsorbents and Catalysts, Burwell, Jr., Chemtech, Jun. 1974, pp. 370-377.

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