Recovery of hydrogen iodide

Patent · Sat Jan 01 00:00:00 EST 1983

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, San Diego, CA (United States)
• 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

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