While looking around UTFSE, SWIT noticed a possibility for iodine tinctures. It seems that nobody has made much mention, probly not the most economical if using 30mL tincs, nonetheless...
The available tincture used in this example has 2%I2, 2.4%NaI, 47% ethyl, rest H20, no extra or hidden gaaks. First NaOH with around the theoretical amount required to convert the I2 to NaI. With the given amount, the tincs eventually turns clear and is heated until dry. Each 30mLs yield totals a couple grams of NaI, possibly some iodate, but that doesn't seem as though it would affect the cleanliness later on, esp since it is being used immediately vs leaving it for hours or days etc.
Standard muriatic acid (HCL 33%) would be added to the NaI... NaI+HCl > HI+NaCl. A dilute transparent yellow aqueous HI layer forms above a solid bottum salt layer. When done and cool from reacting and layers now well separated, upper layer can be decanted and filtered off and would be fairly clean HI. Boiling this to 127C in some kind of receiver/condensor based distiller should concentrate whats boiling to 57%. In the event that it does happen to be too dirty for use, a reciever could collect the HI once 127C is met instead.
This would be easier and seems as though it would get more grams worth to rXn use vs. having to convert it all back to I2, esp if H202 is the oxidizer, and then possibly having to recryst that as well to get it clean (resulting in another yield hit). The chances of screwing up concentrating the acid provided reasonable equip appears minimal. It would also significantly reduce the RP needed.
With another method seen, phosphoric acid and KI can get HI, but that method seems far more risky and difficult (ie more prone to failiure for a newbee). The quality of the chemicals necessary also incur more difficult availability for some ppl, inc SWIT.
Comments. Is this a reasonable method?