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Fractional Distilation.
Hi,
I am a GCSE student and I realise the basics behind fractional distilation and what goes on. However, can someone go over what happens in terms of the b.p of the fractions and what goes on?
I am a GCSE student and I realise the basics behind fractional distilation and what goes on. However, can someone go over what happens in terms of the b.p of the fractions and what goes on?
(edited 3 years ago)
The mixture is heated until it all vaporises. The gases then rise through a series of cooling dish things (not sure what they are called). These are placed so that the temperature they are at corresponds with a b.p of fractions. As the gases rise (due to physics) the layers get cooler and cooler so the fractions condense on the different layers with the highest b.p. at the bottom and the lowest at the top.
azhao
The mixture is heated until it all vaporises. The gases then rise through a series of cooling dish things (not sure what they are called). These are placed so that the temperature they are at corresponds with a b.p of fractions. As the gases rise (due to physics) the layers get cooler and cooler so the fractions condense on the different layers with the highest b.p. at the bottom and the lowest at the top.
Yes hence separating the mixture, i think those cooling dishes are called 'bubble caps' although i may be wrong
Laith
So the vapour itself cools? Right. Ones with higher BP are at the bottom of the column, and lower are at the top. Why is this?
it is because as the height increases, parts of the mixture in gaseous form have reached a temperature below that of there boiling point (as temp decreases with increasing height) so they are no longer in that state but rather a liquid. i think though they have to place the caps to avoid the liquid then falling back into the gaseous state
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