Chemistry of inorganic compounds – Halogen or compound thereof – Hydrogen halide
Patent
1987-02-12
1988-07-12
Stoll, Robert L.
Chemistry of inorganic compounds
Halogen or compound thereof
Hydrogen halide
423484, 423488, C01B 719
Patent
active
047568992
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 in the presence of a catalyst which comprises effective amounts of molybdenum or an inorganic molybdenum 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 contaminants.
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Boghean Barry J.
Butt Donald C.
Jenczewski Theodore J.
Morgan Thomas R.
Sturtevant Robert L.
Allied-Signal Inc.
Friedenson Jay P.
Mui Adriana L.
Stoll Robert L.
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