Author Topic: Formaldehyde  (Read 857 times)

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wimpy

  • Guest
Formaldehyde
« on: May 31, 2004, 07:23:00 PM »
SWIM is thinking about how to obtain a little Formaldehyde - if he got for example a solution of 13,0 g Formaldehyd, 3,6 g Glyoxal, 3,2 g Glutaral  per 100g, how could the Formaldehyd be separated from the two other ingredients - destillation is the only thing SWIM can think of, but if formaldehyde has a boiling point of around minus 20 degree of Celsius ...
(bp Glutaral 72C, Glyoxal 51C , as far as i know)
Has anyone experiences with something like this (or maybe any idea or suggestion)?
Thanks


ning

  • Guest
You would somehow catch it
« Reply #1 on: June 03, 2004, 04:36:00 AM »
for example, by bubbling it through methanol or water to make formalin solution, perhaps.


wimpy

  • Guest
thanks!
« Reply #2 on: June 05, 2004, 06:21:00 PM »
Thanks ning, that seems to be at least worth a try :)


Nicodem

  • Guest
I can't remember exactly how, but formaldehyde
« Reply #3 on: June 05, 2004, 07:42:00 PM »
I can't remember exactly how, but formaldehyde solution can bee made to polymerize into paraformaldehyde (which is even more usefull, BTW). I think adding a few drops of HCl or H2SO4 should precipitate the paraformaldehide. Filter, wash and dry it. Glyoxal and glutaral might also polymerize (I don't know) but since they are lesser components and probably form more polar stuff I think you can wash them out of paraformaldehyde with water.


wimpy

  • Guest
thanks!
« Reply #4 on: June 08, 2004, 01:49:00 PM »
Thanks Nicodem, should be worth a try, too. I guess that should also work with Formalin Solution (35%) ? Just asking, SWIw managed to obtain about 900ml of that, if i'm lucky he will give me some if i ever decide to work with it  ;)