Purifying iodine

[suss]

Hello bees,

Another crazy idea. Swim has been reading about iodine purification by sublimation, and is wondering if the following idea would work:

1. Place iodine and DH20 in flask.
2. Connect tubing to top of flask.
3. Run tubing into large container of iced water.
4. Heat flask to boiling.

Here is the theory:

Iodine is not very soluble in water. If you boil the water/iodine mixture, the iodine will hopefully sublime. The steam generated by the boiling water should carry the sublimed iodine through the tube and into the cold water, where it will condense and fall to the bottom.

What do you think? Should work, and is easier to set up than a cold finger.

[livid]

[weaz1dls]

Sublimation is not only to extract iodine from povidone.  It is however a means of purification.  Filter collected iodine from tinc is the norm and will work well when washed with dh20 and dried.  Purists will go a step further and sublime the resulting iodine to collect nice crystaline iodine.  Adding water to iodine and then boiling it could be both good or bad depending on your desired end product.  If dry iodine is your goal then your procedure would not be the best way.  Boiling the iodine and water will transfer the iodine as well as anything that can travel with the steam ending up with the same reults you could get from a water wash.  You would also lose some iodine to the process, tubing (if not glass) and it will not put the brakes on for some ice in another container.  Boil some plain water into some ice,  see the steam escape?  add water to ice see the steam escape?  Iodine is no punk it will go through plastic, paper, wood,etc.  SWIW has a coffe carafe with a glass dome candle holder inserted in the carafe. Like stacking a bowl into the carafe. it fit perfect.  iodine from a tinc extraction is placed in carafe.  The inverted dome is place in and sealed with elec tape.  Cool water is put into the dome to act as a cold finger condencer.  If the water is to cold condesation will build and the subliming iodine can easily be shaken off wich is a pain in the ass. Try to get the iodine as dry as possible before this procedure.  Anyway this is all placed on the back burner of the stove above the hot air port from the oven.  The oven is turned on and as the hot air hits the bottom of the carafe the purple clound increases inside the carafe.  Swirling around.  Since the air rises up the side of the carafe the iodine won't collec much on the sides.  Large shads begin to grow from the dome looking like purple metalic snowflakes. water in the dome is sucked out and one ice cube is placed in it when the pruple cloud first begins. This one cube method is maintained throughout the procedure. the flakes have no more room, the carafe is removed from heat, cut the tape with razor after sucking out all water. the dome is carefully removed over newspaper and the crystals arescraped off onto the paper.

There was a post about sublimation using a glass tube from floresent lights to collect then with a plunger pushed through the tube the crystals were collected.  Never tried it.  SWIW washes the tinc collected iodine very well and prefers the trace moisture as SWIW has grown used to it.  Retired the carafe setup to much trouble for un-noticable results in the end honey! Just wash it good.  oh and btw,

UTFSE!