Manufacture of high purity low arsenic anhydrous hydrogen fluoride

Patent · Tue Jul 12 04:00:00 EDT 1988

OSTI ID:6779442

Jenczewski, T J; Sturtevant, R L; Morgan, T R; Boghean, B J; Butt, D C

A process for manufacturing anhydrous hydrogen fluoride with reduced levels of arsenic impurity from arsenic contaminated anhydrous hydrogen fluoride is described which comprises: (a) contacting the anhydrous hydrogen fluoride with an effective amount of hydrogen peroxide to oxidize the arsenic impurity in the presence of a catalyst which comprises a catalytic amount of (i) molybdenum or an inorganic molybdenum compound and (ii) a phosphate compound, at a temperature and for a period of time sufficient to oxidize volatile trivalent arsenic impurities in the anhydrous hydrogen fluoride to non-volatile pentavalent arsenic compounds, and (b) distilling the resulting mixture and recovering anhydrous hydrogen fluoride with reduced levels of arsenic impurity.

• Assignee: Allied-Signal Inc., Morris Township, Morris County, NJ
• Patent Number(s): US 4756899
• OSTI ID: 6779442
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ARSENIC
CATALYSTS
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DISTILLATION
ELEMENTS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
IMPURITIES
INORGANIC ACIDS
METALS
MOLYBDENUM
MOLYBDENUM COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PEROXIDES
PHOSPHATES
PHOSPHORUS COMPOUNDS
PRODUCTION
PURIFICATION
REFRACTORY METAL COMPOUNDS
REMOVAL
SEMIMETALS
SEPARATION PROCESSES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS