Distillation plants, also known as distillation units or distillation systems, are industrial facilities used to separate components of a liquid mixture based on their different boiling points. Distillation is a widely used separation process that exploits the differences in vapor pressures of the components in a liquid mixture. It is commonly used to purify liquids, separate components from a mixture, or produce high-purity substances.

The basic principle of a distillation plant involves heating the liquid mixture to its boiling point, and then cooling and condensing the vapors back into liquid form. The condensed liquid, known as the distillate, is collected separately from the remaining components that did not vaporize.