Method of preparing optical fibers of silica

Details Method of preparing optical fibers of silica Method of preparing optical fibers of silica

1979-10-12

1981-08-04

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423341, C01B 3312

Patent

active

042821967

ABSTRACT:
A hydrolysis method of purifying silicon tetrachloride is shown that reduces losses in optical fibers made from silica produced therefrom. Water is added to impure liquid silicon tetrachloride, which forms a gel which is then separated from the remaining SiCl.sub.4. Metal impurities, OH-containing impurities, and SiHCl.sub.3 are removed by this process. In a preferred embodiment, the water is added by bubbling a wet gas through the SiCl.sub.4. A residual amount of OH containing impurities and HCl is left after the hydrolysis, which impurities may be further removed by a refluxing technique.

REFERENCES:
patent: 2820698 (1958-01-01), Krchma
patent: 2977198 (1961-03-01), MacInnis
patent: 3071444 (1963-01-01), Theurer
Beattie et al., "J. of the Chem. Soc.", (Britain), pp. 2072-2075, (1962).
Iler, "The Colloid Chem. of Silica and Silicates", pp. 68-71, Cornell Univ. Press (1955).

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