Chemistry of inorganic compounds – Halogen or compound thereof – Hydrogen halide
Patent
1976-12-30
1978-03-07
Stern, Edward
Chemistry of inorganic compounds
Halogen or compound thereof
Hydrogen halide
423488, 423555, C01B 722, C01F 1146
Patent
active
040780473
ABSTRACT:
In the reaction of phosphate-containing fluorspar with sulphuric acid to produce gaseous hydrofluoric acid, withdrawing the hydrofluoric acid and condensing it, the improvement which comprises adding to the fluorspar a reactive iron compound in an amount approximately equivalent to the phosphate content whereby the phosphate content of the condensed hydrofluoric acid is markedly diminished. The reactive iron compound can be contained in another fluorspar which is blended in the first fluorspar in the requisite amount and/or it can be an iron oxide, fluoride or sulphate, or a hydrated or hydratable iron compound added to the phosphate-containing fluorspar in about 0.2 to 5% by weight calculated as Fe.sub.2 O.sub.3 content and based on the fluorspar.
REFERENCES:
patent: 1665588 (1928-04-01), Harshaw et al.
patent: 3017246 (1962-01-01), Kamlet
patent: 3087787 (1963-04-01), Flemmert
patent: 3160473 (1964-12-01), Hayworth et al.
patent: 3718736 (1973-02-01), Watson et al.
Book "A Course in Gen. Chem,", 3rd Ed., 1927, by W. McPherson and W. E. Henderson, p. 601., Ginn & Co., N. Y.
Bayer Aktiengesellschaft
Stern Edward
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