Recovery of hydrofluoric acid from aqueous fluosilicic acid

Details Recovery of hydrofluoric acid from aqueous fluosilicic acid Recovery of hydrofluoric acid from aqueous fluosilicic acid

1973-09-26

1976-07-27

Stern, Edward

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423341, 423488, C01B 3308, C01B 3310, C01B 3312, C01B 722

Patent

active

039718450

ABSTRACT:
Recovery of hydrofluoric acid from aqueous fluosilicic acid by treating said aqueous fluosilicic acid at a temperature of from 100.degree. to 300.degree.C. and under a pressure of from 3 to 80 atmospheres and separating resulting hydrogen fluoride containing aqueous phase and silicon tetrafluoride containing gaseous phase and optionally hydrolyzing the silicon tetrafluoride containing gaseous phase in aqueous medium and recycling the aqueous fluosilicic acid to the process as starting material.

REFERENCES:
patent: 1244032 (1917-10-01), Chappell
patent: 3218124 (1965-11-01), Oakley, Jr. et al.
patent: 3218125 (1965-11-01), Houston et al.
patent: 3218128 (1965-11-01), Klem
patent: 3455650 (1969-07-01), Conte et al.
patent: 3758674 (1973-09-01), Parish et al.
patent: 3773907 (1973-11-01), Blochl et al.
patent: 3855399 (1974-12-01), Van Eiji

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