Here is some information that I did have from Worlock's website back when it was available...I am uncertain as to who the credit goes to since it doesn't say within the post. It isn't directly related to I2 extraction from KI but maybe it might bee of some use to someone. Pyrex out of archived info :-)
Converting iodine tincture
Tincture of iodine is iodide salts in alcohol, it is found in supermarkets in small one ounce bottles. Each bottle can generate a little over a gram of I2 the price has shot up from 0 .60 cents to $1.80 / bottle. Tincture comes in 2% or 7%. XXXX XXXX carrys 2% for $.87.
It is also available at feed and tack stores in pints and gallons.
Formula one
1 pint 7% tincture iodine
3 pints of hydrogen peroxide
2 oz of HCl
1/2 cup of d-H20
Shake it up, in a one gallon jug,
Wait 20 minutes
Filter through a pantyhose
Wring out fluids.
Put iodine crystals in a glass jar,
Re-wash four times with distilled water, cover, shake, pour off the water into a filter
On the final water wash, wash the iodine into a into a fresh filter,
Wring it out hard,
Open up filter roll into a dry filter
Wring out hard
Put crystals in a dark place to dry.
Use a Drying agent like Calcium Chloride store with the I2 in a sealed chamber
Grocery stores, for mildew prevention near the moth balls
I2 is light sensitive and will degrade.
When completely dry store in light resistant container..
Formula 2
1) 1000 ml 2% Iodine tincture = 2.5%I+2.5%KI in etOH and H2O =-
2) 250 ml Muriatic acid = 34.4%HCl
3) 475 ml Hydrogen peroxide = 3% solution of H2O2
4) 1750ml Distilled H2O
In a 1 gallon container (plastic or glass),
mix 1 liter of 2% tincture of iodine
with 250 ml of Muriatic acid
stir and allow to sit for 15 min.
Add 475ml of a 3% hydrogen peroxide
stir and let sit an additional 15 min.
Add 1750 ml distilled H2O
shake and let sit for 15 min more.
An orange water layer appears on top of a dark gray layer of I2.
Pour off most of the the orange water
Add fresh distilled H2O shake and let sit
Pour off most of the the orange water
Wash a total of three times with distilled water (more can't hurt)
On the last wash pour the I2 into a stack of 5 coffee filters
Wring it dry
roll the iodine ball into 5 dry coffee filters
Wring it dry
Roll it into 5 more dry filters
wring it dry
Put the I2 in a small clean glass jar break up the iodine ball
place the jar of I2 on a piece of cardboard, cover the I2 with a larger jar
put in freezer for several hours
Remove jar of I2, seal it tight, with cellophane then screw on the cap store it in a dark cool environment
Potential problems Not rinsing the I2 enough with water to remove the chlorine and salts from the tincture Not drying the I2 out enough and adding it too wet to your reaction. If in doubt at all re-wash the iodine with distilled water in a filter and wring out, The iodine is only very slightly soluble in water, you lose very little washing with water. If it is not clean and dry you can lose a lot more in a failed reaction.
And yes both of the above methods do indeed work as is.. I have used both personally. Pyrex out
