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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Is there not a strict definition of what naphtha vs petrol represent?
If you search for information about fractional distillation of petroleum, many sources place petrol above naphtha, while others do the reverse.
Is there not a strict definition of what these compounds ...
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Evolution of distillation system over time
In my example, suppose we had a system of multiple components (benzaldehyde, benzyl alcohol, methyl benzoate) and wanted to separate the mixture using fractional distillation.
If we rule out any ...
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How feasible is it to separate acetone, butanol, and ethanol (and water) via simple distillation?
I have no experience distilling, though I understand the basics about it. When two liquids with different boiling points are mixed, you can sometimes separate them by boiling away one of the liquids, ...
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History of Azeotrope (azeotropic mixtures)
I'm currently researching the history of azeotropic mixtures for an essay, and I've come across some interesting information. The term "azeotrope" was coined in 1911 by English chemists John ...
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When Should you use grease to lubricate ground glass joints?
I am getting ready to try steam distillation following this guide which references an earlier chapter which says "If using grease as recommended by your instructor, lightly grease all joints.&...
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In distillation at what stage does purification happen? [closed]
A novice question: is it purified during evaporation or elsewhere? I’m getting a water distiller for drinking water after re-adding minerals for health reasons. I described how it works to my son. He ...
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How to remove color from bromostyrene/dibromostyrene
Distillation under low heat can remove color (excess bromine) but this is time consuming and there is a danger of bromostyrene polymerization even with added TBC.
In aqueous, sodium thiosulphate can ...
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How can I isolate products that cannot be cleanly distilled or visualised by TLC for column chromatography?
I am a first year PhD student in the UK, and without giving too many details of my work as it is industrially funded and my sponsors are a bit touchy over IP, I am struggling to isolate the products ...
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Distillation thermometer position
I am aware that in theory the position of the thermometer needs to be right at the transition point of the vapor into the condenser. In practice,I don´t reach the exact boiling temp. at this height ...
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How does steam distillation work to extract a substance from a mixture, below its boiling point?
This is a small confusion I have regarding steam distillation. Let us consider a sample of water mixed with an organic compound that is insoluble in water. Let us also consider that the boiling point ...
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Fractional Distillation Question
We're covering fractional distillation in my physical chemistry class. I'm confused regarding this diagram:
From your starting point, you heat the binary mixture (in this case benzene and toluene) to ...
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How can I read an Anschütz/Bennert manometer and how can I make sense of it?
Recently I have come across a mercury-filled manometer for vacuum distillation that somewhat resembles a U-tube shaped manometer, but with one arm sealed and completely filled with mercury. Searching ...
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Fractional Distillation Fractions
Currently, I am trying to remember the order of fractions within the fractionating column. However, I have found a contradiction.
Consider the above diagrams, both from reputable sources. The first ...
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Distillation of free fatty acid from soya acid oil
I have soya acid oil with FFA percentage of about 40. After degumming and glycerolysis I am able to bring down the FFA percentage to 5. It does go down to about 2 percentage but it takes an enormous ...
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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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