Even only one
Centigrade can be enough!Why?:
Your “Definition” of a “Simple Fractional Distillation with a Fractionating Column”(SFD/FD
) is nearly in all directions TOO, too weak!
That’s why also the O2/Argon is an SFD/FD
only at the correct low Temperature! (Of course, optimised!)
Do you know what the “Height Equivalent to a Theoretical Plate
) is and how it is defined?
But the HETP is by far not the only parameter who influences the Effectivity of every SFD/FD!
There are also such Parameters like: “Diameter
”, “Reflux Ratio
”, etc., etc.But the Base of all
is the “Rauolt’s Law
” you may read on: "Rauolt’s Law
”Only as an Example
: HETP Parameter for only a “Vigreux Column
Diameter [cm] HETP [cm]
2.4 ~ 11.5
1.2 ~ 5.4
0.6 ~ 2.9
But even these values are strong influenced by “Burden/Loading
” in mL per minutes!
And in the Attachment you can see the Influence of the “Reflux Ratio
” for three different Ratios (A1, A2, and A3).Hints: y
= Ratio of partial pressures in the gas phase. x
= Concentration of the liquid phase. XB
= Starting Concentration. XD
= Preferred End Concentration. A1
= Situation, where you need infinite
Number of plates. A2
= Situation, where success is assured in the Lab. A3
= Situation, where Rectification is impossible.
In A.72. you see the Temperature Situation for Benzene Toluene during Distillation: a.)
SFD without FD. b.)
SFD/FD with a FD of ~12 “Theoretical Plates” and “Reflux Ratio” of 1:10. c.)
SFD/FD with a FD of ~12 “Theoretical Plates”, but condensing all Vapour.
(Also in this case a minimal “Reflux Ratio” exists.)
you may also read on: "Theoretical Plate
I hope this is giving you at least an Idea, what you should all define before!