As far as I see (e.g. for a oil), these are the ways to go:
(in no order)
1. 1x vac-frac distill
2. 2x simple-vac distill
3. double or tripping freezing
4. 1x simple-vac + 1x freezing
Sure it depends also on the "seen" purity after the work,
if someone should "repeat" it again to get a better purity.
( from a other bee: " Garbage in - Garbage out : Good stuff in - Good stuff out! " )
btw, a water aspirator is a very cheap vacuum source.
It´s buyable or it´s possible to build one or more own.
There´s no need to distill in special cases without vacuum.
At least, for other substances a vacuum source is "required".
Post 462575
(mindlib: "OTC stirrer + OTC heating mantle", Chemicals & Equipment)Have a good day!
Feel free to comment....
EDIT: Bubbleplate, you use "between" the vacuum-adapter (or whole piece condenser) and the vacuum pump a "condensation trap", e.g. a Woulfsche Bottle ?