Stoni-- I have noticed that a few times when I was using only recovered I2, and none from tincture. I just chalked it up to not doing a good enough job resubliming the I2. I'm the only person
I have ever seen do it, which means I learned how by reading about it here, and can't say for sure I do it the right since I've never seen anyone else do it. My method does work...so I guess I got the idea. But I wonder if it leaves some trash in.
Since I became a devotee of the long wet reflux, all my reactions seem calm, boring, and not worth watching. Good thing that they don't need to be watched.
The recycled I2 has never been a problem except the time I tried using it without resubliming it. Nope. Not a good idea at all.
I learned NOT to do that--but at least I learned
something that day.
I have never seen anyone extract I2 from an iodide soup with bleach either...and I obviously have not figured that one out, since I always wind up adding too much bleach and lose it. I noted the comments in this thread about the push pull tank water, and the suggestion to extract it with bleach alone. The bleach and iodides react and form I2 and HCl. Is the HCl manufactured fouling the process if I previously added enough acid to make the reaction fluid slightly acidic. I would think one would not want to use H2SO4 to drop the pH if the planned addition of bleach was going to produce HCl. That would produce some gas would it not? Any suggestions for a search and siezure man who can't get the goods with bleach?