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, San Diego, CA (United States)
- DOE Contract Number:
- AC02-80ET26225
- Assignee:
- GA Technologies Inc., San Diego, CA (United States)
- Patent Number(s):
- US 4396591; A
- Application Number:
- PPN: US 6-379363
- OSTI ID:
- 7004292
- Resource Relation:
- Patent File Date: 18 May 1982
- Country of Publication:
- United States
- Language:
- English
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Hydrogen iodide decomposition
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDRIODIC ACID
EXTRACTION
DECOMPOSITION
HYDROBROMIC ACID
IODINE
BROMINE COMPOUNDS
CHEMICAL REACTIONS
ELEMENTS
HALOGEN COMPOUNDS
HALOGENS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IODINE COMPOUNDS
NONMETALS
SEPARATION PROCESSES
400105* - Separation Procedures