Recovery of hydrogen iodide

Patent · Fri Dec 31 23:00:00 EST 1982

OSTI ID:864644

Norman, John H ^[1]

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1. La Jolla, CA

A method of extraction of HI from an aqueous solution of HI and I.sub.2. HBr is added to create a two-phase liquid mixture wherein a dry phase consists essentially of HBr, I and HI and is in equilibrium with a wet phase having a far greater HBr:HI ratio. Using a countercurrent extractor, two solutions can be obtained: a dry HBr--HI--I.sub.2 solution and a wet essentially HBr solution. The dry and wet phases are easily separable, and HI is recovered from the dry phase, after first separating I.sub.2, as by distillation. Alternatively, the HI-HBr liquid mixture is treated to catalytically decompose the HI. HBr is recovered from the wet phase by suitable treatment, including high-pressure distillation, to produce an H.sub.2 O--HBr azeotrope that is not more than 25 mole percent HBr. The azeotrope may be returned for use in an earlier step in the overall process which results in the production of the aqueous solution of HI and I.sub.2 without major detriment because of the presence of HBr.

• Research Organization: General Atomics
• DOE Contract Number: AC02-80ET26225
• Assignee: GA Technologies Inc. (San Diego, CA)
• Patent Number(s): US 4396591
• OSTI ID: 864644
• Country of Publication: United States
• Language: English

Related Subjects

/423/23/203/
25
added
alternatively
aqueous
aqueous solution
azeotrope
catalytically
consists
consists essentially
countercurrent
create
decompose
detriment
distillation
dry
dry phase
earlier
easily
equilibrium
essentially
extraction
extractor
hbr
hbr--hi--i
hi-hbr
high-pressure
hydrogen
hydrogen iodide
including
iodide
liquid
liquid mixture
major
method
mixture
mole
mole percent
o--hbr
obtained
overall
overall process
percent
phase
phase liquid
phases
presence
process
produce
production
ratio
recovered
recovery
results
returned
separable
separating
solution
solutions
step
suitable
treated
treatment
two-phase
two-phase liquid
wet
wet phase