Distillation: processes – separatory – Addition of material to distilland to inhibit or prevent...
Patent
1976-02-23
1977-02-15
Bernstein, Hiram H.
Distillation: processes, separatory
Addition of material to distilland to inhibit or prevent...
203 53, 203 83, 423341, 423472, 423483, 423335, 252397, B01D 336
Patent
active
040081303
ABSTRACT:
Fluorosilicic acid solutions, which normally undergo decomposition when distilled, thereby creating unwanted forms of SiO.sub.2, are rendered stable during distillation by providing in the fluorosilicic acid solution an amount of HF which is at least about 10 parts of HF per 36 parts of H.sub.2 SiF.sub.6 and an amount of H.sub.2 O which is at least about 54 parts of H.sub.2 O per 36 parts of H.sub.2 SiF.sub.6. The mixture is distilled to remove any excess H.sub.2 O and excess HF that is present, without encountering formation of SiO.sub.2, until an azeotropic solution containing about 36% H.sub.2 SiF.sub.6, about 10% HF and about 54% H.sub.2 O is reached. The ternary azeotrope, being of constant quality and concentration, is more suitable for use in various processes, such as processes for making fumed SiO.sub.2, than H.sub.2 SiF.sub.6 solutions which are not of constant quality or concentration.
REFERENCES:
patent: 3848061 (1974-11-01), Lave
patent: 3855399 (1974-12-01), Eiji
patent: 3971845 (1976-07-01), Becker
Calvin Donald W.
Leathers Joel F. M.
Bernstein Hiram H.
Lee Walter J.
The Dow Chemical Company
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