From: Dr. D.Basavaiah-(RS) (dbscrs$##$uohyd.ernet.in)
Date: Sun Apr 02 2000 - 09:19:39 EDT
Dear Ashish:
Thank you for the reply. But, there are some reports of serious explosions
when THF is treated with KOH.(See Burfield JOC, 1982, 47, 3821-24) (The
process is actually deflagration!)
Are you sure that good quality THF will remove peroxides safely?
Also, at an industrial level, use of benzophenone/ketyl is not viable, so
we use very good quality molecular sieves for drying.
Thank you once again and keep in touch
Krish
**************************************************************************
Research Scholar
School of chemistry Telephone: 3010500 extn:4807
University Of Hyderabad
Hyderabad- 500 046
India
e-mail: dbscrs$##$uohyd.ernet.in
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On Fri, 31 Mar 2000, A De wrote:
> Calcutta, March 31, 2000
> Keep it over good quality KOH. You may have to repeat a couple of times.
> When the colour is gone do the KI/HCl test and finally carry out the
> standard benzophenone ketyl procedure.
> Cheers
> Asish
> Professor Asish De
> Dept. of Organic Chemistry
> Indian Association for the Cultivation of SCience
> Calcutta - 700 032
> INDIA
>
>
> On Thu, 30 Mar 2000, Dr. D.Basavaiah-(RS) wrote:
>
> >
> > Dear Colleagues:
> > I have large quantitiy of colored THF that has to be recovered. Before
> > distillation I want to make sure that the peroxide content is within 40ppm
> > limit. In the standard test, KI/HCl, we do not get quantitative
> > information.
> > Also, I wonder how to get rid of the peroxide, if the peroxide limit is
> > beyond the limit. We cannot use alumina since it leads to enormous loss of
> > solvent.
> > I thank you in advance for the information
> > Krish M. Chary
> >
> > **************************************************************************
> > Research Scholar
> > School of chemistry Telephone: 3010500 extn:4807
> > University Of Hyderabad
> > Hyderabad- 500 046
> > India
> >
> > e-mail: dbscrs$##$uohyd.ernet.in
> >
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> >
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