Chemistry of inorganic compounds – Halogen or compound thereof – Hydrogen halide
Patent
1989-12-12
1991-09-10
Lewis, Michael L.
Chemistry of inorganic compounds
Halogen or compound thereof
Hydrogen halide
423483, 210758, C01B 719
Patent
active
050472267
ABSTRACT:
There is disclosed a process wherein impurities are removed from hydrofluoric acid by converting the highly volatile arsenic compounds into a compound with a very high boiling point. The process comprises the following steps: input of distilled hydrofluoric acid, which contains arsenic, into a reactor and cooling down to a temperature below room temperature; oxidation of the arsenic contained in the hydrofluoric acid in the form of arsenic trifluoride with an oxidizing agent in the presence of a surplus of potassium ions coming from potassium bifluoride in order to obtain an arsenic complex which is both stable and of high boiling point; halting the cooling of the reaction mixture and continuation of the stirring for a period of from 1-24 hours, permitting the mixture to remain quiescent to permit deposition; and finally distilling of the hydrofluoric acid at a temperature below reflux conditions, whereupon the arsenic complex formed during the oxidation reaction is removed from the hydrofluoric acid.
REFERENCES:
patent: 3166379 (1965-01-01), Bradley et al.
patent: 4032621 (1977-06-01), Meadows
patent: 4491570 (1985-01-01), Wheaton et al.
Bolam Brian M.
Fluorex, S.A. DE C.V.
Lewis Michael L.
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