Method for dehydrating hydrogen fluoride

Details Method for dehydrating hydrogen fluoride Method for dehydrating hydrogen fluoride

1987-11-04

1989-05-23

Stoll, Robert L.

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423488, 423612, 423608, C01B 719, C01B 708, C01G 23047, C01G 2502, C01G 2702

Patent

active

048329355

ABSTRACT:
A method for controlling the water present in hydrogen fluoride is described which effectively removes all the water contained in the hydrogen fluoride solution to form other compounds that either have extremely low vapor pressure or are acceptable in a process such as chemical vapor purification. The method involves as one of the steps the contacting of a reactive metal halide with a hydrogen fluoride containing water. The metal halide reacts with the water contained in the hydrogen fluoride solution yielding a metal oxide, hydrogen halide, and anhydrous hydrogen fluoride. The metal oxide is a solid, with low vapor pressure, thereby effectively removing oxygen-bearing species from the hydrogen fluoride.

REFERENCES:
patent: 2388156 (1945-10-01), Kelley
patent: 2507605 (1950-05-01), Lopker et al.
patent: 4652438 (1985-11-01), Folweiler
Kirk-Othmer, "Encyclopedia of Chemical Technology", vol. 12, 3rd ed., p. 76.

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