Simple distillation is the procedure where two liquids of different boiling points can be separated. Generally the liquids should have a boiling point below 150 C, and these liquids should dissolve in each other, for example water and isobutyl alcohol can be distilled with simple distillation, but water and an oil could not. In simple distillation the vapors are channeled directly into a condenser, so the product will not be 100% pure.

For a very high purity Reflux Distillation would be required, and Oil/Water mixes would require Steam Distillation.