The binary mixture of acetone boiling point and methanol boiling point is difficult to separate by distillation because of the presence of a minimum boiling azeotrope mole acetone at This Demonstration shows that MEK boiling point cannot be used as an entrainer to break this azeotrope at 1 atm Indeed MEK forms with methanol a minimum boiling azeotrope mole MEK at and a distillation boundary shown in cyan divides the composition space into two distillation regions Methanol and acetone are separated by this boundary The temperature versus warped time clearly shows the nature of the pure components and azeotropes indicated by a green line is an unstable node Acetone and indicated by a blue line are saddle points MEK and methanol indicated by a red line are stable points Two snapshots show what happens if you choose a simple binary mixture Of course for a ternary mixture you have to select a locator position inside the triangular diagram