All Questions
Tagged with distillation alcohols
9
questions
0
votes
1
answer
320
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Why does brandy have a higher methanol-to-ethanol ratio than beer, despite the distillation?
From my googling, beer tends to contain around 16mg/L of methanol. While for brandy, typical methanol content is around 1000mg/L (give or take a factor of 3, depending) The distillation that brandy ...
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3
votes
1
answer
2k
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Does yeast, sugar and water really produce any noticable/significant amounts of methanol?
I just read this question on Quora about distilling during pre-industrial age, which reminded me about multiple discussions I have heard or read during the years about whether the fermentation process ...
- 217
0
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1
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Is 99% Isopropyl Alcohol sold in stores really 99%?
My understanding is that an azeotropic mixture of isopropanol and water is 91%. This makes sense as to why there are so many brands of rubbing alcohol sold at 91%. There are also some sold as 99%, ...
- 127
5
votes
2
answers
808
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Why is ethanol distilled off before adding water in the first step of a malonic synthesis?
I am doing a malonic synthesis shown below, and I wonder why I should distill ethanol off before adding water in the first step of the reaction (First I add absolute ethanol and solid sodium).
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3
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1
answer
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Isopropyl alcohol still leaves evaporation residue after distillation
I just finished distilling two liters of IPA because evaporating 5 ml on a watch glass revealed it to contain quite a bit of dissolved impurities. However, it still leaves some residue, even though I ...
- 101
1
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0
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53
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Distillery Transfer Hoses
I was hoping an actual person could offer me some advice. I work in a craft distillery and I'm getting a lot of mixed information on how compatible PVC is with high-proof alcohol. It definitely seems ...
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19
votes
5
answers
14k
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Un-denaturing industrial alcohol
I have a question regarding the denaturation of industrial ethanol with methanol to discourage its consumption.
The boiling point of methanol is 64.7 °C, while the boiling point of ethanol is 78.37 °...
- 444
1
vote
3
answers
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Denatured Ethyl Alcohol Purification
I have denatured ethyl alcohol which was obtained this formula;
In 100 L ethyl alcohol there is 0.8 gr denatonium benzoate and 78 gr tert-Butyl alcohol.
Is there any way to obtain absolute ethyl ...
- 31
4
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1
answer
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Simple distillation & azeotropes
In my organic chemistry lab, we recently had an experiment where we were given a mixture of 50:50 ethanol & ethylene glycol. We were supposed to perform a simple distillation to calculate the ...
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