Process for oxidation of hydrogen halides to elemental halogens
Patent
·
OSTI ID:868150
- 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
- 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
The kinetics of the oxidation of sulphur dioxide over molten salts
|
journal | October 1968 |
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Related Subjects
/423/
absorbing
additional
alkali
alkali metal
alkali metals
bromine
capable
chlorine
compound
compound capable
contacted
contacting
containing
containing oxygen
corresponding
dissolved
dissolved oxygen
elemental
elemental halogen
elemental halogens
elevated
elevated temperature
followed
gas
gas containing
gaseous
generating
halide
halides
halogen
halogens
hydrogen
hydrogen halide
hydrogen halides
improved
improved process
inert
inert substrate
intermediate
intermediate temperature
iodine
maintaining
metal
metals
mixture
molar
molar ratio
molten
molten salt
optical
oxidation
oxidized
oxygen
oxygen compound
porous
process
produce
produce elemental
product
purging
ratio
reacting
reaction
recovering
recycle
regenerated
relatively
relatively inert
salt
salt mixture
selected
stage
steam
substrate
substrate-supported
sufficient
sulfur
sustain
temperature
temperature stage
temperature sufficient
thereafter
unreacted
valence
whereby
absorbing
additional
alkali
alkali metal
alkali metals
bromine
capable
chlorine
compound
compound capable
contacted
contacting
containing
containing oxygen
corresponding
dissolved
dissolved oxygen
elemental
elemental halogen
elemental halogens
elevated
elevated temperature
followed
gas
gas containing
gaseous
generating
halide
halides
halogen
halogens
hydrogen
hydrogen halide
hydrogen halides
improved
improved process
inert
inert substrate
intermediate
intermediate temperature
iodine
maintaining
metal
metals
mixture
molar
molar ratio
molten
molten salt
optical
oxidation
oxidized
oxygen
oxygen compound
porous
process
produce
produce elemental
product
purging
ratio
reacting
reaction
recovering
recycle
regenerated
relatively
relatively inert
salt
salt mixture
selected
stage
steam
substrate
substrate-supported
sufficient
sulfur
sustain
temperature
temperature stage
temperature sufficient
thereafter
unreacted
valence
whereby