/ck/ - Food & Cooking

I think I finally got it
ethyl acetate freezes at -83.6 °C
acetone is at -94.7 °C
methanol is at -97.6 °C
ethanol is at -114.14 °C
However ethylene has a boiling point of -103.7°C, meaning that you can relatively effectively precipitate out everything but the methanol with it, which you can then filter off, and then let the ethylene evaporate away, leaving only your ethanol remaining, and some water depending on how thorough you have been with your drying steps
however you will still need to source the ethylene, which is at cryogenic temperatures, and get equipment to handle it.
optimally there should've been a cryogenic liquid with a boiling point slightly warmer than the freezing point of ethanol to make everything faster, but I can't find any right now.