|Late 1700 to Early 1800 Pot Still|
|Laboratory Pot Still|
Chill the outside of this vapor tube cooling the vapor faster, perhaps bathing the tubing in some cool water for example. This is the essence of fractional distillation! How do you know which liquid is coming out of the tubing? That’s easy! Look at the thermometer. Knowing the temperature of the liquid you can infer what’s boiling, and hence what’s coming out of the tube in cooled form. If all you want is ethanol, only collect the liquid that’s coming out when the thermometer reads 173 F.
|Modern Column Still|