Iodinating reagents hydriodic acid

In the endothermic HI reaction, hydriodic acid Hix from Bunsen reaction is concentrated in a number of steps and the resulting hydrogen iodide concentrate is decomposed into reagent iodine and product hydrogen gas. The HI reaction steps appear to have the largest room for process improvement, for which several innovative process techniques have been incorporated in the present flowsheet. The HI concentration steps combine electro-electrodialysis cell and carbonized osmosis membrane to reduce excess iodine and water prior to final distillation. An iodine absorber is integrated into the HI decomposer to improve decomposition ratio in a newly proposed Co- regenerated process ... 

X = OH) by the above reagent, while reduction of the iodine of the intermediate iododesoxyvomicine by hydriodic acid would accommodate the formation of desoxyvomicine (CXXXIV, X = H) by the latter reagent. The isolation of acetaldehyde (36) (80% yield) from the ozonolysis of the colorless form of desoxyvomicine has been used as an argument in favor of CXXXIV (X = H) for this base, while it is considered that the double bond may be at A - (CXXXV) in the yellow isomer (36) although this hardly explains the color of this compound. 

Electrophilic Addition This can be considered as an acid—base reaction, where the reagent acts as an acid, whether a protic one (e.g., hydriodic acid or iodine monochloride) or a Lewis acid (e.g., molecular iodine, which can be polarized by electrophilic solvents or catalysts), and the double-bond acts as abase (Argentini, 1982). 

Organic peroxides Hydriodic acid. Spray plate with a reagent comprising 40 ml glacial acetic acid and 0.2 g zinc dust added to 10 ml of 4% aqueous potassium iodide, then spray with fresh 1% starch solution. Peroxides (and certain other types of oxidising agents) revealed by liberation of free iodine. Alternatively use 2,6-dibromobenzoquinone chlorimine. [28]... 

Transfer a suitable weight of sample (catalysts and sulfuric acid absent) and 5 ml of pure hydriodic acid (AnalaR about 55%) to a clean Kjeldahl flask with B19 quickfit socket. Warm gently and introduce 50 mg pure red phosphorus and some porous pot. Reflux for 45 minutes and then dilute with 5 ml water. Add 5 ml concentrated sulfuric acid and mix. Boil the mixture rapidly (without condenser) to remove hydriodic acid and iodine vapour. If iodine is not completely removed add a further 5 ml of water and boil again until the mixture fumes. Carry out an identical reagent blank omitting only the sample additions. Add a suitable quantity of Kjeldahl digestion catalysts A or B (Table 2.8), concentrated sulfuric acid and 0.05 g glucose (note 3) to the reduced sample and blank solutions. 

---