Isolating fluorine compounds from the vapors obtained when evapo

Details Isolating fluorine compounds from the vapors obtained when evapo Isolating fluorine compounds from the vapors obtained when evapo

1980-01-31

1981-05-26

Nozick, Bernard

Gas separation

Means within gas stream for conducting concentrate to collector

423240, B01D 4700

Patent

active

042696097

ABSTRACT:
Fluorine compounds which are contained in the vapors obtained when evaporatively concentrating phosphoric acid are removed by scrubbing with an aqueous solution of fluosilicic acid under reduced pressure at a temperature at which condensation of steam is substantially avoided. The aqueous fluosilicic acid solutions are injected, at a speed of from 15 m/s to 40 m/s, into the upper part of a scrubbing zone, finely dispersed over the entire cross-section of the latter. The vapors are passed through the scrubbing zone at a speed of from 5 to 30 m/s, in co-current with the fluosilicic acid solutions. The residence time of the vapors in the scrubbing zone is from 0.4 to 1.5 s. The fluosilicic acid taken off the scrubbing zone contains from 20 to 28% by weight of H.sub.2 SiF.sub.6.

REFERENCES:
patent: 3091513 (1963-05-01), Darish
patent: 3512341 (1970-05-01), English
patent: 3893830 (1975-07-01), Peterson et al.
patent: 4106918 (1978-08-01), Fujikawa et al.

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