Questions tagged [distillation]
For questions about the process of distillation. For the distillation process used in metal refining, also use the [metallurgy] tag.
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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 °...
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Proper use of vacuum pump during vacuum distillation
I am preparing to do a vacuum distillation and am unsure exactly how to manage the vacuum. The vacuum pump I have is a two-stage rotary vane pump which is capable of 250 microns or lower. It has a ...
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Enrichment of D2O
The Wikipedia page for deuterium oxide (heavy water) says that its boiling point is 374.5 K and the one for ordinary water is 373.13 K.
Is there a way of distillation which we can use to enrich ...
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Do light and heavy water form an azeotrope?
(Interested in the general principle too, not just for water and its variants, but with particular emphasis on it.)
When you distill a weak ethanol-in-water solution, you get a condensate that's ...
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Vacuum distillation apparatus selection and configuration
I want to assemble a "hobbyist-level" vacuum distillation apparatus for extracting small volumes of "typical" solvents (e.g., water, alcohols, ketones, diols).
I already have standard lab glassware ...
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Why is NMP developing a yellow color after distillation?
I got an aqueous mother liquor of N-methyl-2-pyrrolidone (NMP) from some reaction I was running and when I redistilled it under vacuum, it came out colorless but turned yellow the next day. I am ...
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Distilling milligram quantities of oil like it's late 1970s
In a currently retracted* manuscript by Tomas Hudlicky [1, Retraction Watch] the following has been noted:
Fifty years ago professors took an active part in all laboratory instructions and they ...
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Isopropyl alcohol forming peroxides
I read in many MSDS that Isopropyl alcohol tends to form peroxides (by reacting to air OR light) which may explode when they reach a given concentration.
For example: http://nj.gov/health/eoh/rtkweb/...
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Alcohol (ethanol) distillation: mystery congener
I regularly home-distil small amounts of potable alcohol (ethanol), mainly from fermented sugar(s) solutions (the 'wash').
My still is a box standard, $4.5\mathrm{L}$ electrically heated (safety!), ...
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To heat or not to heat; distillation?
One of the questions in a recent past paper I completed was:
One way to make water from the reservoir suitable for drinking is by distillation.
Describe how water is distilled.
And I answered ...
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steam distillation of 4-bromoaniline , why render it basic prior
In the multistage synthesis of 4-bromobenzenamine, why must the solution be rendered alkaline prior to the steam distillation after the hydrolysis of 4-bromo-N-ethanoylbenzenamine?
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How to increase the concentration of HCl
Today I have purchased some $\ce{HCl(aq)}$ on my local market with a concentration of 23%.
However, I need to obtain a concentration of 37% in order to perform an experiment. Can I use distillation ...
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Does distilled water still have ions in it? Does deionized water lack ions, but still have other "stuff" in it?
This isn't a question about the difference between Deionized and Distilled water, my hope is that for once it's actually a chemistry question related to this topic.
Distilled water is created by ...
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N2O production vs air distillation
After producing nitrogen by distilling air, how is that nitrogen used with the oxygen to yield nitrous oxide ($\ce{N2O}$)? I see $\ce{N2O}$ available in different purities from various suppliers, but ...
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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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