From: Jacob Zabicky (zabicky$##$bgumail.bgu.ac.il)
Date: Tue Jan 22 2002 - 04:26:11 EST
Hello Fergus,
The following is worth pursuing only if your quantities are really large.
Determine first what kind of alumina you have at hand (most probably you
have beta or gamma alumina, but it may be another variety). This can easily
be done by powder X-ray diffraction, and needs being done to ensure that
you do not change the nature of the material on doing the following
treatment:
Take a small sample of the material and calcinate it in an oven at 500 C,
for at least 1 hour. Check if the diffraction pattern remained unchanged.
If so there you have the procedure to achieve a regenerated/cleaned alumina
for reuse. If the pattern changed, slightly reduce the calcination
temperature, but the time of calcination should be longer. Repeat this
procedure until the diffraction pattern is constant. Calcination at lower
temperatures may leave a dark hue on the material. This need not
necessarily be bad for the purpose you stated. Before you go on
regenerating the whole amount, its worthwhile testing whether the small
sample you prepared does the intended job.
All the best,
Jacob
At 17:33 19/1/2, F.J. Lalor wrote:
>I have a quantity of alumina which has been used - quite some time
>ago - to pre-dry and remove peroxides from tetrahydrofuran. Can
>anyone tell me how to regenerate and whether any precautions are
>necessary other than the safe removal of any volatiles. I have
>access to a vacuum oven with a maximum temperature of 200 deg. C.
>TIA -
>Fergus Lalor
>--
>
>--------------------------------------------------
>Dr. Fergus Lalor, Senior Lecturer, Chemistry Dept., University
>College, Cork, IRELAND.
>Telephone: 353-(0)21-902317. Fax: 353-(0)21-274097
>
>
>
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Prof. Jacob Zabicky
Institutes for Applied Research
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