Distilling Ethanol by Refrigerating

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Discussion Overview

The discussion revolves around the feasibility of distilling ethanol by cooling it below the freezing point of water and separating it from a mixture based on density differences. Participants explore historical methods of alcohol production and the limitations of this cooling method in achieving pure ethanol.

Discussion Character

  • Exploratory
  • Technical explanation
  • Historical

Main Points Raised

  • One participant questions whether cooling a mixture of ethanol and water to below the freezing point of water could serve as a viable distillation method, noting the lower density of ethanol.
  • Another participant references historical practices in Germany where freezing was used to concentrate alcohol in beers, suggesting that this method has been employed in the past.
  • Some participants assert that while the cooling method can work, it has limitations in achieving high purity of ethanol due to the freezing behavior of water and ethanol mixtures.
  • There is a suggestion that traditional distillation methods should be employed after initial cooling to achieve higher purity levels of ethanol.

Areas of Agreement / Disagreement

Participants express a mix of agreement and uncertainty regarding the effectiveness of the cooling method for distillation. While some affirm its potential, others highlight limitations and suggest additional methods for achieving purity.

Contextual Notes

Participants note that the freezing point of ethanol and its mixture with water complicates the distillation process, and there are unresolved questions about the efficiency of the proposed method in practice.

drosser
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Ethanol seems to be popular for an alternative fuel for cars. If you distilled the ethanol by cooling it and exceeding the saturation point, because it has a lower density than water (.789 grams/cubic cm), the ethanol it would float to the top. You could take the mixture below the freezing point of water and poor the ethanol off the top. My question is, could this work as a distillation method, or am I just wrong?
 
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i believe this is actually how high alcohol-containing beers were first made in germany..they would take two kegs of lager, leave them outside to be frozen, then take the part that didnt freeze (ethanol + other stuff) and combine that with a fresh keg of lager. (nowadays most places use new strains of yeast or just add pure ethanol).
 
drosser said:
Ethanol seems to be popular for an alternative fuel for cars. If you distilled the ethanol by cooling it and exceeding the saturation point, because it has a lower density than water (.789 grams/cubic cm), the ethanol it would float to the top. You could take the mixture below the freezing point of water and poor the ethanol off the top. My question is, could this work as a distillation method, or am I just wrong?

yes it works, but you are only going to be able to get the ethanol pure to a certain amount before the water will stop freezing out--just take like how a bottle of 80 proof vodka won't freeze if you put it in the freezer.
 
gravenewworld said:
yes it works, but you are only going to be able to get the ethanol pure to a certain amount before the water will stop freezing out--just take like how a bottle of 80 proof vodka won't freeze if you put it in the freezer.

distill it in the regular fashion after that
 

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