From: Ilya Avrutov (IAvrutov$##$dalton.com)
Date: Wed Apr 19 2006 - 13:06:28 EDT
Dear Jmarjorie
It's difficult to predict whether they form azeotropic mixture or not
based only on their boiling points (though the fact they are miscible
increases the chances that they don't form it). Try to find in
literature the data about azeotropic properties of your compounds or
just to try the distillation, it may be easier to determine by trial.
The lower the distillation rate the more probability you will separate
them (if they do not form azeotrope).
Best,
Ilya
<http://www.dalton.com/>
Ilya Avrutov
Process Development Group Leader Dalton Pharma Services
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From: everybody-bounces$##$orglist.net
[mailto:everybody-bounces$##$orglist.net] On Behalf Of fine chem
Sent: Tuesday, April 18, 2006 4:56 AM
To: everybody$##$orglist.net
Subject: ORGLIST: Fractional Distillation - seperation of mixtures
Dear All,
This goes out to those expert in fractional distillation : A mixture
contains 2 organic liquids (completely miscible with each other), one
with a boiling point of 80 deg C and the other with a boiling point of
35 deg C.
Can the two liquids be completely seperated by fractional distillation
using a very long column or will they behave as a binary azeotropic
mixture at constant pressure (constant boiling point mixture) and the
distillate still contain proportions of both mixtures ?
I'am asking as I have not fully understood the concept; some say the
mixtures are not seperable while others say the mixtures are completely
seperable; am confused.
jmarjorie
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