Recovery of hydrogen iodide

Details Recovery of hydrogen iodide Recovery of hydrogen iodide

1982-05-18

1983-08-02

Vertiz, O. R.

Chemistry of inorganic compounds

Halogen or compound thereof

23298, 203 43, 423481, 423488, 423501, 423648R, C01B 700, C01B 302, B01D 1100, B01D 1104

Patent

active

043965911

ABSTRACT:
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.

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