Distillation

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Diagram of simple distillation set-up without a fractionating column often used by chemists. Shown in use.
1. heat source (a Bunsen burner here)
2. distilling flask (a round bottom flask)
3. distilling head
4. thermometer
5. condenser
6. cooling water in
7. cooling water out
8. receiving flask collecting dripping distillate
9. vacuum source
10. vacuum adapter

Distillation is a chemical engineering unit operation where two liquids are separated from each other. You do this by heating the liquids until they boil. The liquids will have different vapor pressures, and so one of them will evaporate before the other does. The vapor is then led into a condenser, which takes off its heat and condenses it back to liquid. A fractionating column can be used to improve the separation. Distillation is a mass transfer unit operation.

The vaporized and condensed component is called distillate and the other component as bottom product

This has been used for a long time, to distill alcohol, and produced distilled beverages. Distillation is a commonly used operation in oil industry, where it is used to produce various fuels and raw materials from crude oil.

Illegally distilled alcoholic drink is called moonshine.^{[needs proving]}

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