Purified Urea

Michael Witty mw132 at mole.bio.cam.ac.uk
Wed Jan 17 04:37:29 EST 2001

Dear Randy, I did this once about 15 years ago.  I think what I did was to
recrystalize from ethanol by dissolving the urea in a big (1l at least)
beaker in hot ethanol (hot plate/fume hood/heat till boiling).  When it
has all dissolved let it cool slowly (overnight) and you will find lots of
crystals of urea.  When I did it there was a lot of yellow stuff still
dissolved in the ethanol. Do this repeatedly if you are keen.  Urea
decomposes to ammonia if heated too much (is it about 80 degrees?).

Look urea up in the Merck Index to get more details.

Like I said, this is from memory: everyone should comment!  Mike.

 On Tue, 16 Jan 2001, Randy wrote:

> Our lab is trying to find a procedure to purify Urea. Does anyone out there
> have a procedure/reference to purify this chemical? Any help will be greatly
> appreciated.
> Randy Durren
> rldurren at unity.ncsu.edu

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