Another point of interest, that is actually a very serious warning.
The gaskets that you use are important.
The solvents used in extractions vary in properties, but a prominent characteristic is that some solvents eat some types of gaskets.
Having gaskets blow, because the solvent ate through them, is something that can happen.
Since the range of solvent choices is wide, I suggest that PTFE gaskets are the ideal choice, since PTFE is OK with just about everything. That said, they are terribly difficult to seal.
A couple of compromise solutions are available…Envelope gaskets and Tuf-Steel gaskets
Envelope gaskets are PTFE, on top of (enveloping), a different material.
Tuf-steel are a 50:50 mix of PTFE and nano-sized stainless steel.
Either one will be a good choice, as they are both PTFE types. Get them as your first choice, don’t bother buying the others.
For reference: silicone seals are cheap, but are only good with alcohols…never use them with alkanes.
This system, as shown will easily handle solvents with sea level boiling points greater than -15 F, or so. Butane, Dimethyl Ether, Pentane or hexane would be fine.
Running straight propane, or even propane mixes would probably require a much larger chiller. The best achievable, with 99% ISO/DI slurry, at around -110 F, but the column is short. Explosive gas through the vacuum pump is not good.