Process for manufacture of anhydrous hydrogen fluoride and finel

Details Process for manufacture of anhydrous hydrogen fluoride and finel Process for manufacture of anhydrous hydrogen fluoride and finel

1977-11-14

1979-03-13

Prescott, Arthur C.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204301, 423337, 423240, 423484, B01D 1302, C01B 719, C01B 3300

Patent

active

041441583

ABSTRACT:
An improved process is described for converting aqueous fluosilicic acid waste product into anhydrous hydrogen fluoride and finely divided silica in which aqueous fluosilicic acid is pyrolyzed to produce silica and a dilute aqueous solution of hydrogen fluoride and fluosilic acid. The resulting dilute solution is subjected to electrodialysis, thereby obtaining a hydrogen fluoride concentration greater than that which characterizes the boiling point ridge which divides the phase diagram of the system hydrogen fluoride/fluosilicic acid/water, i.e. HF/H.sub.2 SiF.sub.6 /H.sub.2 O, into two regions. Anhydrous hydrogen fluoride is recovered from the resulting composition by distillation.

REFERENCES:
patent: 3787304 (1974-01-01), Chlanda et al.
patent: 3907653 (1975-09-01), Horn

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