Process for oxidation of hydrogen halides to elemental halogens

Patent · Wed Jan 01 00:00:00 EST 1992

OSTI ID:868150

Lyke, Stephen E ^[1]

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1. Middleton, WI

An improved process for generating an elemental halogen selected from chlorine, bromine or iodine, from a corresponding hydrogen halide by absorbing a molten salt mixture, which includes sulfur, alkali metals and oxygen with a sulfur to metal molar ratio between 0.9 and 1.1 and includes a dissolved oxygen compound capable of reacting with hydrogen halide to produce elemental halogen, into a porous, relatively inert substrate to produce a substrate-supported salt mixture. Thereafter, the substrate-supported salt mixture is contacted (stage 1) with a hydrogen halide while maintaining the substrate-supported salt mixture during the contacting at an elevated temperature sufficient to sustain a reaction between the oxygen compound and the hydrogen halide to produce a gaseous elemental halogen product. This is followed by purging the substrate-supported salt mixture with steam (stage 2) thereby recovering any unreacted hydrogen halide and additional elemental halogen for recycle to stage 1. The dissolved oxygen compound is regenerated in a high temperature (stage 3) and an optical intermediate temperature stage (stage 4) by contacting the substrate-supported salt mixture with a gas containing oxygen whereby the dissolved oxygen compound in the substrate-supported salt mixture is regenerated by being oxidized to a higher valence state.

• Research Organization: Battelle Memorial Institute, Columbus, OH (United States)
• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Institute (Richland, WA)
• Patent Number(s): US 5084264
• OSTI ID: 868150
• Country of Publication: United States
• Language: English

Related Subjects

process
oxidation
hydrogen
halides
elemental
halogens
improved
generating
halogen
selected
chlorine
bromine
iodine
corresponding
halide
absorbing
molten
salt
mixture
sulfur
alkali
metals
oxygen
metal
molar
ratio
dissolved
compound
capable
reacting
produce
porous
relatively
inert
substrate
substrate-supported
thereafter
contacted
stage
maintaining
contacting
elevated
temperature
sufficient
sustain
reaction
gaseous
product
followed
purging
steam
recovering
unreacted
additional
recycle
regenerated
optical
intermediate
gas
containing
whereby
oxidized
valence
temperature stage
oxygen compound
dissolved oxygen
hydrogen halides
inert substrate
elemental halogen
relatively inert
salt mixture
molar ratio
hydrogen halide
improved process
gas containing
alkali metal
elevated temperature
molten salt
temperature sufficient
alkali metals
containing oxygen
compound capable
produce elemental
elemental halogens
intermediate temperature
/423/