Novel calcium chloride scrubbing bath

Details Novel calcium chloride scrubbing bath Novel calcium chloride scrubbing bath

1977-12-22

1979-05-15

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Halogenous component

423481, 423483, 423488, 423490, B01D 5334

Patent

active

041548043

ABSTRACT:
In accordance with the process of the present invention, substantially complete removal of hydrogen fluoride values from a hydrogen chloride gas stream containing the same is effected by a process wherein the gas stream is contacted with an aqueous medium containing calcium chloride and hydrogen chloride under conditions sufficient to precipitate calcium fluoride, thereby producing a hydrogen chloride acid gas substantially free of hydrogen fluoride. The aqueous solution containing the calcium fluoride solids may be treated as by filtration to remove the solids and the recovered liquor may be recycled to the absorption stage, with optional addition of make-up calcium chloride, for removal of additional hydrogen fluoride.

REFERENCES:
patent: 2345696 (1944-03-01), Benning et al.
patent: 2507603 (1950-05-01), Killgore
patent: 2526777 (1950-10-01), Smith et al.
patent: 2690815 (1954-10-01), Calfee et al.
patent: 2920941 (1960-01-01), Sanlaville et al.
patent: 3140916 (1964-07-01), Lowdermilk
patent: 3743704 (1973-07-01), West

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