by Kenster » Fri Mar 31, 2017 7:18 pm
JL, sounds like a near perfect run on the VM, as Sam says, to squeeze out all the remaining alc you need to retro fit a LM component to your column. By nature, the VM will not go beyond a certain point, hence its attractiveness as a very clean/foolproof system with minimal smearing.
Ideally, you take off the heads with your LM, switch to hearts with VM, and back to LM when/if you want to squeeze the tails.
The VM works by the fact that alc vap is heavier than air, so by the time the vap is at about 40% it stops output and goes into 100%reflux. The VM will never extract the last drop.