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understanding distillation and WTF azeotrope is all about

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understanding distillation and WTF azeotrope is all about

Postby manu de hanoi » Wed Jan 22, 2014 2:11 am

I found this great online course that *intuitively* walks you through distillation from the more theoretical point of view but without dumping annoying integrals and greek letters on you. I believe a rather solid high school level is required to follow it.
here
http://www.chemguide.co.uk/physical/pha ... d.html#top
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Re: understanding distillation and WTF azeotrope is all abou

Postby just sayin' » Wed Jan 22, 2014 7:08 am

Thanks, Manu. Good resource!
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Re: understanding distillation and WTF azeotrope is all abou

Postby Zymurgy Bob » Wed Jan 22, 2014 11:45 am

I've bookmarked that "Disney" of Roualt's law to drop on the next temperature-controlled "magic boiler" newby that wanders in. Maybe it'll stick. Often, nothing does.
Zymurgy Bob, a simple potstiller http://www.kelleybarts.com/zymurgy-bob- ... e-spirits/

You can make whisky in a reflux still, you can make vodka in a potstill,
and you can eat chicken noodle soup with a crescent wrench. But...
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Re: understanding distillation and WTF azeotrope is all abou

Postby manu de hanoi » Wed Jan 22, 2014 2:41 pm

I was trying to understand more about the root causes of the azeotrope, and here's the big lesson:

there is an azeotrope because ethanol and water like themselves more than each other, so when they are together in a liquid, this mix boils easier - meaning at a lower temperature than what we'd expect from the weighted average of boiling points - because both of them would rather be in a gaz far from each other than stuck together in a liquid.

The consequence is that the 95% azeotrope boils at 78.2 C vs 78.5 C for 100% ethanol and this somehow prevents further purification.
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Re: understanding distillation and WTF azeotrope is all abou

Postby vadiia » Wed Jan 22, 2014 10:11 pm

nice reading!
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