Method of extracting iodine from liquid mixtures of iodine, water and hydrogen iodide

Patent · Mon Jan 01 00:00:00 EST 1979

OSTI ID:863459

Mysels, Karol J.

The components of a liquid mixture consisting essentially of HI, water and at least about 50 w/o iodine are separated in a countercurrent extraction zone by treating with phosphoric acid containing at least about 90 w/o H₃PO₄. The bottom stream from the extraction zone is substantially completely molten iodine, and the overhead stream contains water, HI, H₃PO₄ and a small fraction of the amount of original iodine. When the water and HI are present in near-azeotropic proportions, there is particular advantage in feeding the overhead stream to an extractive distillation zone wherein it is treated with additional concentrated phosphoric acid to create an anhydrous HI vapor stream and bottoms which contain at least about 85 w/o H₃PO₄. Concentration of these bottoms provides phosphoric acid infeed for both the countercurrent extraction zone and for the extractive distillation zone.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-80ET26225
• Assignee: General Atomic Company (San Diego, CA)
• Patent Number(s): 4,176,169
• Application Number: 05/921435
• OSTI ID: 863459
• Resource Relation: Patent File Date: 1978 Jul 03
• Country of Publication: United States
• Language: English

Related Subjects

method
extracting
iodine
liquid
mixtures
water
hydrogen
iodide
components
mixture
consisting
essentially
50
separated
countercurrent
extraction
zone
treating
phosphoric
acid
containing
90
bottom
stream
substantially
completely
molten
overhead
contains
fraction
amount
original
near-azeotropic
proportions
particular
advantage
feeding
extractive
distillation
treated
additional
concentrated
create
anhydrous
vapor
bottoms
contain
85
concentration
provides
infeed
acid containing
stream contains
liquid mixture
overhead stream
liquid mixtures
consisting essentially
phosphoric acid
vapor stream
hydrogen iodide
substantially complete
extraction zone
mixture consisting
extractive distillation
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