Recovery of hydrogen iodide
A method is described for 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. 1 fig.
- Research Organization:
- General Atomics
- DOE Contract Number:
- AC02-80ET26225
- Assignee:
- GA Technologies Inc., San Diego, CA (United States)
- Patent Number(s):
- A; US 4396591
- Application Number:
- PPN: US 6-379363
- OSTI ID:
- 7004292
- Country of Publication:
- United States
- Language:
- English
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Hydrogen iodide decomposition
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Related Subjects
400105* -- Separation Procedures
BROMINE COMPOUNDS
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
EXTRACTION
HALOGEN COMPOUNDS
HALOGENS
HYDRIODIC ACID
HYDROBROMIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IODINE
IODINE COMPOUNDS
NONMETALS
SEPARATION PROCESSES