Chemistry of inorganic compounds – Halogen or compound thereof – Hydrogen halide
Patent
1988-07-11
1990-05-29
Russel, Jeffrey E.
Chemistry of inorganic compounds
Halogen or compound thereof
Hydrogen halide
203 31, C01B 719, B01D 334
Patent
active
049294350
ABSTRACT:
A process for manufacturing high purity anhydrous hydrogen fluoride (HF) having low levels of arsenic impurity by contacting anhydrous hydrogen fluoride product, or an intermediate product obtained during the manufacture of HF, with hydrogen peroxide to oxidize the arsenic impurity in the presence of a catalyst which comprises a catalytic amount of a component selected from the group consisting of molybdenum, a molybdenum compound, vanadium, and a vanadium compound, and a phosphate compound. The volatile trivalent arsenic impurity in the anhydrous hydrogen fluoride is oxidized to a non-volatile pentavalent arsenic compound and the resultant mixture is distilled to recover high purity anhydrous hydrogen fluoride with reduced levels of arsenic impurity. In one embodiment, an oxidizing agent such as nitric acid or a nitrate salt is added to the reaction mixture to oxidize organic compounds.
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Boghean Barry J.
Redmon Charles L.
Subbanna Somanahalli N.
Wamser Christian A.
Allied-Signal Inc.
Brown Melanie L.
Friedenson Jay P.
Kalinchak Stephen G.
Russel Jeffrey E.
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