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Alcohol Distillation under Vacuum low temp loss of vacuum question...


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So I made alcohol vacuum still.

I have the coils submerged in a dry ice and alcohol to keep it super chilled, the coils are made of copper.

 

I'm certain I have no leaks but as soon as I start using the coils I can't reach full vacuum. \

 

My theory is that sub zero conditions are causing a drop in vacuum pressure. Can someone confirm this?

Thanks.

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