bubble.. this is really very easy.
I used to distill this shit for my RC cars.. all I did was set the oil bath temp to 95c and come back in a few hours and meoh, and azeotrope will have filled the reciever, nothing else coming over, got it all. Cranked the heat up a little, soon the thermo read 101c.. nitro. Collect 30 drops, add back to fuel bottle, change with a clean new flask, collect close/too pure nitro. Really quiet easy. And not dangerous.
& I'm, somethin of a phenom, 1 puff of da cron, I'm un-stopable.