This would normally be considered
to be fairly “pure” cyclohexane. At the same time, as we remove cyclohexane from the mixture,
the residue has been enriched in toluene. By doing three vaporization-condensation steps we
have achieved 99% purity. Each vaporization-condensation step is known as a “simple
distillation”. Thus, for this mixture, three simple distillations have produced the desired
purification. Please note that the simple distillation is suitable for separation of the mixtures
which has different in BP higher than 80 C.