From: Deepak Shukla (DEEPAK.SHUKLA2$##$ranbaxy.com)
Date: Thu Apr 20 2006 - 00:02:04 EDT
Dear Jmarjorie
Lets take water + Methanol. Completely miscible with each other. Start distillation with long column. Both will come only at their boiling points.
Similarly take Methnaol and Ethanol mixture. This is an ideal mixture if you want to check a fractional column. Note they also do not form azeotrope.
But take water + Ethanol completely miscible. They form an azeotrope. Azeotrope boils at 78°C ,
and 96% Ethanol +4 % water will come as distillate.
So
1. Miscibility may not tell you exactly whether two solvents form an azeotrope or not.
2. Most of common solvents and their azeotrope data are available in slandered tables. In case we do not have data for any specific mixtures data. It will be advisable to take purest available solvents form a known mixture and do the distillation. Then quantify the distillate and residue for both components.
Also note distillation output varies in case batch and continues distillation.
Warm regards
Deepak K Shukla
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Today's Topics:
1. Fractional Distillation - seperation of mixtures (fine chem)
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Date: Tue, 18 Apr 2006 01:56:01 -0700 (PDT)
From: fine chem <chemicals555$##$yahoo.com>
Subject: ORGLIST: Fractional Distillation - seperation of mixtures
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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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